Clinical Policy Bulletin: Cochlear Implants and Auditory Brainstem Implants
Auditory Brainstem Implant
Aetna considers an auditory brainstem implant (ABI) medically necessary in members 12 years of age or older who have lost both auditory nerves due to disease (e.g., neurofibromatosis or von Recklinghausen's disease).
Aetna considers uniaural (monaural) or binaural (bilateral) cochlear implantation a medically necessary prosthetic for adults aged 18 years and older with bilateral, pre- or post-linguistic, sensorineural, moderate-to-profound hearing impairment who meet both of the following criteria:
Member has bilateral severe to profound sensorineural hearing loss determined by a pure tone average of 70 dB or greater at 500 Hz, 1000 Hz, and 2000 Hz; and
Member has limited benefit from appropriately fitted binaural hearing aids. Limited benefit from amplification is defined by test scores of 40 % correct or less in best-aided listening condition on open-set sentence cognition (e.g., Central Institute for the Deaf (CID) sentences, Hearing in Noise Test sentences (HINT), and consonant-nucleus-consonant (CNC) test.
Aetna considers uniaural (monaural) or binaural (bilateral) cochlear implantation a medically necessary prosthetic for children 12 months of age or older with bilateral sensorineural hearing impairment who meet all of the following criteria:
Child has profound, bilateral sensorineural hearing loss determined by a pure tone average of 90 dB or greater at 500, 1000 and 2000 Hz; and
Child has limited benefit from appropriately fitted binaural hearing aids. For children 4 years of age or younger, limited benefit is defined as failure to reach developmentally appropriate auditory milestones measured using the Infant-Toddler Meaningful Auditory Integration Scale, the Meaningful Auditory Integration Scale, or the Early Speech Perception test, or less than 20 % correct on open-set word recognition test (Multisyllabic Lexical Neighborhood Test) in conjunction with appropriate amplification and participation in intensive aural habilitation over a 3 to 6 month period. For children older than 4 years of age, limited benefit is defined as less than 12 % correct on the Phonetically Balanced-Kindergarten Test, or less than 30 % correct on the Hearing in Noise Test for children, the open-set Multi-syllabic Lexical Neighborhood Test (MLNT) or Lexical Neighborhood Test (LNT), depending on the child's cognitive ability and linguistic skills; and
A 3- to 6-month hearing aid trial has been undertaken by a child without previous experience with hearing aids. Note: When there is radiological evidence of cochlear ossification, this requirement may be waived at Aetna’s discretion.
The following additional medical necessity criteria must also be met for uniaural (monaural) or binaural (bilateral) cochlear implantation in adults and children:
The member must be enrolled in an educational program that supports listening and speaking with aided hearing; and
The member must have had an assessment by an audiologist and from an otolaryngologist experienced in this procedure indicating the likelihood of success with this device; and
The member must have no medical contraindications to cochlear implantation (e.g., cochlear aplasia, active middle ear infection); and
The member must have arrangements for appropriate follow-up care including the long-term speech therapy required to take full advantage of this device. (Note: Particular plans may place limits on benefits for speech therapy services. Please consult plan documents for details).
Persons with a unilateral cochlear implant may qualify for subsequent bilateral implantation without having to be retested if medical records document that they had met criteria at the time of the initial (first) cochlear implantation.
A cochlear implant includes external components (i.e., a speech processor, a microphone headset and an audio input selector). Replacement of a cochlear implant and/or its external components is considered medically necessary when the existing device can not be repaired or when replacement is required because a change in the member's condition makes the present unit non-functional and improvement is expected with a replacement unit.
Separate assessment will be performed of the medical necessity of recommended accessories and upgrades for a cochlear implant. The member’s current condition, the member’s capabilities with his/her current cochlear implant, and the member’s capabilities of the upgrade or accessory will be considered in determining whether the upgrade or accessory offers clinically significant benefits to the member.
Upgrade to or replacement of an existing external speech processor, controller or speech processor and controller (integrated system) is considered medically necessary for an individual whose response to existing components is inadequate to the point of interfering with the activities of daily living or when components are no longer functional. Upgrade to or replacement of an existing external speech processor, controller or speech processor and controller (integrated system) is considered not medically necessary when such request is for convenience or to upgrade to a newer technology when the current components remain functional.
The requirement that the member be evaluated by a participating otolaryngologist and audiologist applies only to network plans; all others require documentation of hearing loss which is likely to be improved with the implant.
For adults and children, a post-cochlear implant rehabilitation program is medically necessary to achieve benefit from the cochlear implant. See CPB 0034 - Aural Rehabilitation. The rehabilitation program usually consists of 6 to 10 sessions that last approximately 2.5 hours each.
Aetna follows Medicare rules in considering cochlear implants and auditory brainstem implants as prosthetics. Medicare considers as prosthetics "[c]ochlear implants and auditory brainstem implants, i.e., devices that replace the function of cochlear structures or auditory nerve and provide electrical energy to auditory nerve fibers and other neural tissue via implanted electrode arrays."
The cochlear implant is an electronic prosthesis that stimulates cells of the auditory spiral ganglion to provide a sense of sound to persons with hearing impairment. The patient selection criteria for cochlear implants described above were adapted from the Food and Drug Administration (FDA) approved indications for cochlear implants.
The Centers for Medicare and Medicaid Services (2005) has determined that the evidence is adequate to conclude that cochlear implantation is reasonable and necessary for the treatment of bilateral pre- or post-linguistic, sensorineural, moderate-to-profound hearing loss in individuals who demonstrate limited benefit from amplification. Limited benefit from amplification is defined by test scores of 40 % correct or less in the best-aided listening condition on tape recorded tests of open-set sentence cognition.
Audiologic criteria for pediatric patients follow guidelines similar to those for adults. For adults and children able to respond reliably, standard pure-tone and speech audiometry tests are used to screen likely candidates. For children, the speech reception threshold (SRT) and/or pure-tone average (PTA) should equal or exceed 90 dB; for adults, the SRT/PTA should equal or exceed 70 dB. If the patient can detect speech with best-fit hearing aids in place, a speech-recognition test in a sound field of 55 dB hearing level (HL) sound pressure level (SPL) is performed. A number of speech recognition tests are in current use.
One of the most commonly used speech recognition tests is the Hearing In Noise Test (HINT), which tests speech recognition in the context of sentences. This test uses common, simple sentences such as "How are you feeling?" or "The weather looks good today." HINT reliably and efficiently measures word recognition abilities to determine cochlear implant candidacy. HINT consists of 25 equivalent 10-sentence lists that may be presented in either condition (i.e., quiet, noise) to assess sentence understanding. The HINT test is first administered in quiet, using 2 lists of 10 sentences, scored for the number of words correctly identified. HINT in noise uses sentences administered at +10 signal to noise ratio (Sargent, 2000). For adults, the current cutoff for cochlear implant candidacy is a HINT score of less than 40 %; for children, the current cutoff is a score less than 30 %.
Alternatives to the HINT test for assessing open-set sentence recognition include the CUNY Sentence Test and Central Institute for the Deaf (CID) Test. The words and sentences used for these tests are recorded on tape and used by all cochlear implant centers. All of the tests are of a man's voice and played at the 70 Decibel range.
Central Institute for the Deaf test consists of a list of 20 sentences. Unlike HINT sentences, CID sentences are uncommon sentences that you would not hear on a regular basis. An example of this type of sentence would be something like this: "The vacuum is in the back of the closet" or "The book is on the top shelf next to the pencil".
The CUNY Sentence Test was developed by the City University of New York and consists of 72 lists with 12 sentences each. Each list contains 102 words and is scored for the total number of words correctly identified.
The Phonetically Balanced-Kindergarten (PBK) Test, an open-set test of word recognition is typically included in test batteries designed to assess the speech perception skills of profoundly deaf children with cochlear implants. The PBK Test has been used for almost 50 years to assess spoken word recognition performance in children with hearing impairments. The PBK contains 50 monosyllabic words that the child repeats. The PBK Test is most appropriate for children aged 5 to 7 years.
The Lexical Neighborhood Test (LNT) and the Multi-syllabic Lexical Neighborhood Test (MLNT), developed by Indiana University in 1995, are 2 new open-set tests of word recognition. These tests include words that the child repeats, and have been used to assess recognition of individual words and phonemes in children who are cochlear implant candidates. The LNT and MLNT are based on the lexical characteristics of word frequency and neighborhood density, and include words found in the vocabularies of children age 3 to 5. Results from these tests with pediatric cochlear implant users have shown that their lexicons appear to be organized into similarity neighborhoods, and these neighborhoods are accessed in open-set word recognition tests. Studies have shown that normal hearing 3- and 4-year old children are able to recognize all the words from these 2 open-set speech perception tests at very high levels of performance. Therefore, these results have been used as a benchmark for children with hearing impairments.
Children should be receptive to wearing a hearing aid before cochlear implantation because all current implants require an external processor. A period of hearing aid use to ascertain development of aided communication ability is the critical criterion for determining candidacy of young children.
For adults and children, a post-cochlear implant rehabilitation program is necessary to achieve benefit from the cochlear implant. The rehabilitation program consists of 6 to 10 sessions that last approximately 2.5 hours each. The rehabilitation program includes development of skills in understanding running speech, recognition of consonants and vowels, and tests of speech perception ability.
The auditory brainstem implant (ABI) is a modification of the cochlear implant, in which the electrode array is placed directly into the brain. The FDA has approved the Nucleaus 24 Multichannel Auditory Brainstem Implant (Cochlear Corporation, Englewood, CO) for use in patients suffering from neurofibromatosis type 2, who have developed tumors on both auditory nerves. When these tumors are surgically removed it is often necessary to remove parts of the auditory nerve resulting in total deafness. Hearing aids and standard cochlear implants are not effective in these patients.
In clinical studies submitted to the FDA, 82 % of the 90 patients implanted with the Nucleus 24 Auditory Brainstem Implant System were able to detect certain familiar sounds, such as honking horns and ringing doorbells; 85 % were able to hear and understand conversation with the aid of lip-reading; 12 % were able to hear well enough to use the phone. Of the 90 patients who received this implant 18 % were not able to hear any sound. The ABI System does not restore normal hearing.
It has been estimated that the incidence of meningitis caused by Streptococus pneumoniae in pediatric cochlear recipients was over 30 times that in similarly aged children in the general population. Based on the 2002 CDC recommendation, cochlear implants recipients should receive age-appropriate vaccination against pneumococcal disease. These individuals should receive the 7-valent pneumococcal conjugate (Prevnar®) or 23-valent pneumococcal polysaccharide (Pneumovax® and Pnu-Imune®) vaccine, or both, according to the Advisory Committee on Immunization Practices (ACIP) schedules for persons at high risk. See CPB 0037 - Pneumococcal Vaccine.
There is evidence of the effectiveness of binaural cochlear implants in improving audition over uniaural (monaural) cochlear implants. A recent technology appraisal prepared by the National Institute for Health and Clinical Excellence (NICE, 2007) recommended simultaneous bilateral cochlear implantation as an option for 3 groups of persons with severe to profound deafness who do not receive adequate benefit from acoustic hearing aids: prelingual children, persons who are blind, and persons at risk for cochlear ossification.
A systematic evidence review (Murphy and O'Donoghue, 2007) concluded: "The available evidence indicates that bilateral cochlear implantation confers material benefits not achievable with unilateral implantation, specifically in terms of sound localization and understanding of speech in noise". By combining the results of available studies, the investigators estimated that adult bilateral recipients showed an increase in sentence recognition of 21 % correct over their first implanted ear (p = 0.01) and mean bilateral localization errors of 24 degrees against a monaural error of 67 degrees (p = 0.05). Due to the small number and variety of studies, the investigators were not able to estimate the potential benefits of bilateral cochlear implantation in children. The investigators reported, however, that they identified no high quality evidence for bilateral cochlear implantation, and noted that available evidence has significant limitations that may have influenced these outcomes. The investigators discussed the need for more reliable evidence for bilateral cochlear implantation, and the need to design cochlear implants specifically for bilateral use. The results of these assessments are discussed in further detail below.
As explained below, however, significant product improvements or better quality evidence are unlikely to be forthcoming from industry. Thus, judgments about the effectiveness of bilateral cochlear implantation must be made without the benefit of high quality evidence.
Much of the controversy regarding bilateral cochlear implantation has stemmed from the fact that no evidence for the efficacy of bilateral cochlear implants was presented to the FDA in granting approval for cochlear implants currently on the market. The product labeling for cochlear implants does not address bilateral versus unilateral implantation (hence, bilateral cochlear implants are not technically "off-label"), and there is no evidence that the FDA contemplated bilateral implantation in granting approval of currently marketed cochlear implants. Thus, cochlear implant manufacturers have promoted bilateral cochlear implantation without having to submit evidence of the efficacy of bilateral cochlear implants to the FDA to support specific labeling.
Although currently marketed cochlear implants were designed for unilateral use, the lack of regulatory scrutiny of bilateral placement of these implants decreases incentives for industry to invest resources to develop new cochlear implants specifically for bilateral use, as any new cochlear implants would need supporting evidence of safety and efficacy for pre-market approval (PMA) from the FDA. This lack of incentives also makes it less likely that cochlear implant manufacturers will fund a high quality study of bilateral cochlear implants to provide reliable evidence of their benefits and risks.
Although in normal listeners, binaural hearing improves sound localization and speech perception, such benefits in cochlear implant users may be limited because the implant's direct electrical stimulation of the auditory nerve does not preserve the fine frequency or fine structure of the acoustic waveforms at each ear, as is created with natural hearing. These features are "of indisputable importance" in binaural hearing (Murphy and O'Donaghue, 2007; see also Quentin-Summerfield et al, 2006). In addition, manufacturers have not developed cochlear implants specifically designed for bilateral use. Thus, bilaterally implanted patients use 2 separate signal processors, one controlling each ear, with independent automatic gain control circuitry. This may fail to preserve interaural differences in level accurately. The 2 unilateral processers are not temporally coordinated, so that they may not preserve the fine temporal differences in sound reaching each ear that facilitates sound localization.
The Swedish Council on Health Technology Assessment (SBU), a leading international technology assessment agency, conducted a comprehensive assessment of current evidence for bilateral cochlear implantation in children (SBU, 2006). The assessment concluded: "Scientific documentation on the benefits of bilateral cochlear implantation in children is insufficient. Well-designed, scientific studies are needed to determine whether the method yields positive effects that outweigh the increased risk for complications". In reviewing the best available evidence, the SBU Report found: "Only a few scientific studies (none of which included a control group) have assessed bilateral cochlear implants. Studies using children as their own controls have reported improvements in speech perception and directional hearing when children used both implants instead of only one. However, these studies provide only low-quality evidence because of their design. Results from clinical studies on complications of unilateral CI in children showed that complication rates varied from 2 percent to 16 percent. A second cochlear implant would double the risk for complications. The SBU assessment found that no studies have specifically investigated the complications or side effects from bilateral cochlear implantation". The SBU assessment recommended prospective controlled clinical outcome studies to evaluate the potential benefits of bilateral cochlear implantation.
The SBU graded the quality of all of the evidence that was available until the time that the systematic evidence review was published. The systematic evidence review provided a structured review of all of the evidence, with explicit consideration of the quality of the evidence. This is the first of several systematic evidence reviews of bilateral cochlear implants by any government agency; the fact that the review was prepared by a government funded agency without any particular stake in the issue better assures that the assessment is less prone to bias in its preparation and conclusions.
By contrast, industry-funded advocates have focused their arguments on the benefits of binaural hearing, rather than address the fundamental question of whether there is any reliable evidence that currently available cochlear implants are capable of providing the benefits of binaural hearing. Industry-funded advocates have made reference to the number of studies of bilateral cochlear implants without reference to the quality of that evidence. Advocates have extensively quoted non-peer reviewed promotional literature from cochlear implant manufacturers, and the conclusions of published studies are quoted while omitting an information about the strength of study or the authors' significant qualifications to their conclusions. Advocates have also included abstracts and unpublished articles among cited studies.
Additional literature on bilateral cochlear implants has been published since the SBU assessment. One of these recently published studies -- a randomized controlled clinical trial of bilateral implants in post-lingually deafened adults from the Medical Research Council Institute for Hearing Research (Summerfield et al, 2006) -- is of stronger design than earlier studies. (In theory, the benefits of bilateral cochlear implantation are more likely to be manifested in post-lingually deafened persons than pre-lingually deafened persons). This study found that any benefits of bilateral cochlear implants were modest and offset by negative effects, such that there was no significant improvement in quality of life. This study is important in that it is the only randomized controlled clinical study of bilateral cochlear implants published to date; randomized controlled clinical trials are considered more reliable than uncontrolled studies because they are significantly less prone to bias in interpretation of results. This study demonstrates the feasibility of conducting appropriate and ethical prospective controlled studies of bilateral cochlear implantation. The study by Summerfield et al (2006) is also significant in that it did not only assess intermediate outcomes of changes in audiologic parameters, but it also assessed the clinically relevant outcome of improvement in quality of life. Even though the study by Summerfield et al (2006) included only 24 subjects, it represented one of the largest studies of bilateral cochlear implantation published to date.
In this randomized, controlled study (Summerfield et al, 2006), adult users of unilateral cochlear implants were randomized either to receive a second identical implant in the contralateral ear immediately, or to wait 12 months while they acted as controls for late-emerging benefits of the first implant. A total of 24 subjects, 12 from each group, completed the study. Receipt of a second implant led to improvements in self-reported abilities in spatial hearing, quality of hearing, and hearing for speech, but to generally non-significant changes in measures of quality of life, which were offset by decreases in quality of life due to adverse effects. The investigators concluded: "Multi-variate analyses showed that positive changes in quality of life were associated with improvements in hearing, but were offset by negative changes associated with worsening tinnitus". The lack of net improvement in quality of life precluded a calculation of the cost-effectiveness of bilateral cochlear implantation using the actual outcomes of this study. A net improvement in quality of life estimated only in a hypothetical a best-case scenario, in which no worsening of tinnitus was assumed to occur. The investigators reported, however, that, even in this hypothetical best-case scenario, the gain in quality of life was too small to achieve an acceptable cost-effectiveness ratio". This investigator group is planning a similar randomized controlled clinical study of bilateral cochlear implants in children.
More recently Murphy and O'Donoghue (2007) presented a systematic evaluation of the evidence for bilateral cochlear implantation, which found no high-quality evidence for bilateral cochlear implantation. The investigators found that less than 1/10 of citations retrieved met minimal criteria for consideration as evidence in the analysis, and that more than 2/3 of those citations that qualified as evidence were of poor quality. The investigators identified 387 citations with reference to bilateral cochlear implantation dating back to 1979. Of these 387 articles, 28 were studies meeting minimal criteria for consideration as evidence in this analysis. A further 9 studies were identified from an examination of references and the "gray literature". Of the 37 studies, 9 (24 %) were level 2b evidence (individual cohort study, including low quality randomized controlled trial), 2 (6 %) level 3b (individual case-control study), 16 (43 %) level 4 (case series and poor quality cohort and case-control studies), and 10 (27 %) level 5 evidence (expert opinion).
The authors stated that the results of the literature review identified studies of level 2b to 5 of the benefits of bilateral cochlear implantation (Murphy and O'Donoghue, 2007). However, the investigators found significant limitations that may have influenced their outcomes. The investigators found that most studies failed to provide details of selection criteria, and that some used the same group of cochlear implant users in multiple studies: "In general, the majority of papers failed to detail selection criteria for the participants recruited; in fact, some studies used the same group of cochlear implant users, who will undoubtedly be well-motivated and well-rehearsed in performing these experimental tasks". The investigators found that some studies did not mention the order of testing for bilateral cochlear implant users, a factor that is likely to influence outcomes. They also noted the bias introduced in studies comparing unilateral to bilateral use in persons with bilateral cochlear implants: "It is also important to know that a participant accustomed to wearing bilateral cochlear implants may well perform more poorly in the unilateral condition compared with a unilateral implant user". The investigators stated that "[t]he effect of these issues on a participant's performance could be considerable and may well have influenced the outcome of these clinical studies".
Although bilateral cochlear implantation has been promoted for infants and young children, the investigators found that more than 3/4 of available evidence focuses exclusively on adults (Murphy and O'Donoghue, 2007). Of the 37 studies, 28 (76 %) investigated adults only, 7 (19 %) investigated children only, and 2 (5 %) investigated adults and children.
The investigators concluded that, although available evidence supports the current trend toward bilateral cochlear implantation, "[c]ritical analysis of these studies has highlighted, in particular, the lack of control subjects used and the failure to report important methodologic considerations (e.g., whether sentence tests were open/closed). The low numbers of participants and the poor statistical analysis in the majority of the studies does not allow the reader to assess the true significance of the effects reported. These issues need to be addressed in future longitudinal, prospective clinical studies with sufficient numbers of early (less than 1 year old), simultaneously bilaterally implanted children". The investigators recommended that future implant systems be designed specifically for bilateral use (Murphy and O'Donoghue, 2007).
The conclusions of this assessment are similar to the conclusions of an assessment of cochlear implants prepared by the UK National Health Service (NHS, 2006), which found "no robust evidence" for bilateral cochlear implantation.
In addition, Chin et al (2007) found a lack of reliable evidence comparing the effectiveness of bilateral cochlear implants to binaural/bimodal fitting (combining a cochlear implant and a hearing aid in opposite ears). These researchers (2007) reviewed the evidence to address a question not addressed in the previously cited evidence reviews -- whether better binaural hearing can be achieved with bilateral cochlear implants or binaural/bimodal fitting. The authors found that most studies on comparing unilateral implantation to either mode of bilateral stimulation reported some binaural benefits in some test conditions on average but revealed that some individuals benefited, whereas others did not. The investigators found, however, no reliable evidence comparing bilateral cochlear implants to binaural/bimodal fitting: "There were no controlled comparisons between binaural/bimodal fitting and bilateral implantation and no evidence to support the efficacy of one mode over the other".
A technical report by the American-Speech Language Hearing Association (ASHA, 2004) on cochlear implants found: "Bilateral implantation is currently being studied in a limited number of cochlear implant recipients with mixed results. In some cases, recipients do experience enhanced speech understanding, especially in noise; in other users the improvement in speech understanding compared with unilateral performance is minimal or absent and the primary advantage of binaural implantation is sound localization. Bilateral implantation outcomes to date are encouraging but inconclusive due to the limited number of participants and the scope of the projects. There is a clear need for further exploration of the many variables that can affect the performance of people with binaural implants before widespread use is warranted". The ASHA report emphasized the need for further research on bilateral cochlear implantation: "Many of these studies are currently underway and the results will help to define prognosis and optimization of binaural implant usage. Such studies will determine the ultimate benefit and cost effectiveness of bilateral cochlear implantation".
Offeciers et al (2005) published an "international consensus" that recommended bilateral cochlear implants for all children with profound bilateral hearing loss. However, a review of this paper reveals no evidence that this statement represents anything more than the opinion of the 6 co-authors of this paper. In addition, this paper is not an evidence-based guideline because it makes no reference to the evidence that the coauthors relied upon in reaching their conclusions.
A technology appraisal prepared by the National Institute for Health and Clinical Excellence (NICE, 2007) recommended simultaneous bilateral cochlear implantation as an option for prelingual children with severe to profound deafness who do not receive adequate benefit from acoustic hearing aids. The NICE Appraisal Committee considered the evidence for the clinical effectiveness of bilateral cochlear implants (NICE, 2007). The Committee considered that the additional benefits of bilateral cochlear implantation were less certain than the benefits of unilateral cochlear implantation. This was because of the limitations of the evidence base owing to the small number of studies and the small numbers of participants. However, the Committee considered that the studies had shown additional benefits to having a second cochlear implant in relation to speech perception in noisy situations and directional perception of sound. The Committee heard from patient experts that they considered that there were other benefits from bilateral cochlear implantation. These benefits included easier, less exhausting communication (e.g., determining the direction of the sound in group conversations without unnecessary head movement). The Committee concluded that there were additional benefits of bilateral cochlear implants that had not been adequately evaluated in the published studies. Therefore there was potential for additional gains in quality of life, although these might vary among individuals.
The NICE technology appraisal (NICE, 2007) recommended simultaneous bilateral cochlear implantation as an option for persons with severe to profound deafness who are at risk for ossification of the cochlea (e.g., after meningitis). The Committee heard from clinical specialists that ossification of the cochlea could preclude successful re-implantation if the first implanted device failed. This would not be an issue for situations in which relatively normal cochlear anatomy is preserved and implanting a second device might be possible if the first failed.
The NICE technology appraisal also concluded that simultaneous bilateral cochlear implantation is an option for person who are blind (NICE, 2007). The Committee heard from clinical specialists that for people who are both deaf and blind, the gains in quality of life following bilateral implantation are greater than for other people. This is because of their increased reliance on auditory stimuli for spatial awareness.
Bichey and colleagues (2008) explored improvements in quality of life (QOL) and the cost-utility of bilateral cochlear implantation. A prospective case-control study was conducted on 23 bilateral cochlear implant patients with the Mark III health utility index. Results indicated a 0.48 mean gain in health utility after bilateral cochlear implantation and a discounted cost per quality adjusted life year of $24,859 in this cohort of patients. With a comparison of patient scores for unilateral and bilateral use, improvements in the domains of hearing, speech, emotion, and cognition were noted, resulting in a mean gain in health utility of 0.11. The authors concluded that this study found an improvement in QOL and a favorable cost-utility associated with bilateral cochlear implantation in patients with profound hearing loss. These patients showed additional improvements in QOL after they received their second implant. This is the first study that showed improvements in QOL and a favorable cost-utility after bilateral cochlear implantation in patients with profound hearing loss.
A statement by the Australian Association for the Deaf (2006) identified another problem with bilateral cochlear implants. They do not endorse bilateral implantation due to the fact that any residual hearing a child has will be totally destroyed by the procedure. They explain that rapid changes in related technology mean that, by leaving one ear intact, the child has the potential to benefit from future developments.
An assessment prepared for the Agency for Healthcare Research and Quality (Raman et al, 2011) found that unilateral cochlear implantation with or without additional use of hearing aids has been an effective method of hearing assistance. The reported stated that published studies show improved speech perception and health-related quality of life in adults with sensorineural hearing loss. The assessment stated that bilateral cochlear implantation provides added improvements in speech perception outcomes in noisy environments over unilateral cochlear implants. However, the report stated that further studies with longer follow-up duration are needed to assess the additional benefits in terms of improved health-related QOL and potential risks of bilateral cochlear implantation compared to unilateral implantation. The report noted that, additionally, none of the studies have been able to quantify the sensation described by patients of fusion of bilateral sound into a stereo perception within one's head. The report concluded that there is a need to develop better measures of performance and disease-specific QOL instruments that may reflect the significance of these subjective benefits.
In October 2007, the FDA reminded physicians that patients with cochlear implants for inner-ear malformations, especially implants with a positioner, are at risk for bacterial meningitis from Streptococcus pneumoniae. This warning follows the deaths of 2 children within the past year, aged 9 and 11 years, who had implants with a positioner and were not fully vaccinated. It should be noted that only 1 implant model has a positioner, and it was withdrawn from the market 5 years ago.
To decrease the risk for meningitis in this population, the FDA recommends:
Educating implant recipients and their caregivers about the early signs of meningitis;
Following the CDC's vaccination guidelines;
Treating middle ear infections early.
In a meta-analysis, Vlastarakos et al (2010a) reviewed the evidence on cochlear implantation in infancy, regarding auditory perception/speech production outcomes. The number of cohort-studies comparing implanted infants with under 2-year-old children was 5; 3 represented type-III and 2 type-II evidence. No study was supported by type I evidence. Overall, 125 implanted infants were identified. Precise follow-up period was reported in 82. Median follow-up duration ranged between 6 and 12 months; only 17 children had follow-up duration equal or longer than 2 years. Reliable outcome measures were reported for 42 infants; 15 had been assessed with open/closed-set testing, 14 with developmental rating scales, and 13 with pre-lexical speech discrimination tools. Ten implanted infants assessed with open/closed-set measures had been compared with under 2-year-old implanted children; 4 had shown better performance, despite the accelerated rate of improvement after the first post-operative year. The authors concluded that neuroplasticity/neurolinguistic issues have led cochlear implant centers to implant deaf children in infancy; however, widespread policies regarding the afore-mentioned issue are still not justified. Evidence of these children's outperformance regarding auditory perception/speech production outcomes is limited. Wide-range comparisons between infant implantees and under 2-year-old implanted children are lacking. Longer-term follow-up outcomes should be also made available. They stated that there is a need to develop and validate robust measures of monitoring implanted infants. Potential factors of sub-optimal outcomes (e.g. mis-diagnosis, additional disorders, device tuning, parental expectations) should also be weighted, when considering cochlear implantation in infancy.
In a meta-analysis of diagnostic challenges and safety considerations in cochlear implantation under the age of 12 months, Vlastarakos et al (2010b) stated that the diagnosis of profound hearing loss in infancy, although challenging, can be confirmed with acceptable certainty when objective measures (auditory brainstem response, auditory steady-state response, and otoacoustic emissions) and behavioral assessments are combined in experienced centers. Reliable assessment of the pre-lexical domains of infant development is also important and feasible using appropriate evaluation techniques. Overall, 125 implanted infants were identified in the present meta-analysis; no major anesthetic complication was reported. The rate of surgical complications was found to be 8.8 % (3.2 % major complications) quite similar to the respective percentages in older implanted children (major complications ranging from 2.3 % to 4.1 %). The authors concluded that assessment of hearing in infancy is feasible with adequate reliability. If parental expectations are realistic and hearing aid trial unsuccessful, cochlear implantation can be performed in otherwise healthy infants, provided that the attending pediatric anesthesiologist is considerably experienced and appropriate facilities of pediatric peri-operative care are readily available. A number of concerns, with regard to anatomic constraints, existing co-morbidities or additional disorders, tuning difficulties, and special phases of the developing child should be also taken into account. The present meta-analysis did not find an increased rate of anesthetic or surgical complications in infant implantees, although long-term follow-up and large numbers are lacking.
Table: Usual medically necessary frequency of replacement of cochlear implant parts
Battery charger kit
1 per 3 years
Cochlear auxiliary cable adapter
1 per 3 years
Cochlear belt clip
1 per 3 years
Cochlear harness extension adapter
1 per 3 years
Cochlear signal checker
1 per 3 years
Disposable batteries for ear-level processors
72 per 6 months
Headset (3-piece component)
1 per 3 years
Headset cochlear coil (individual component)
1 per year
Headset cochlear magnet (individual component)
1 per year
Headset microphone (individual component)
1 per year
Headset cable or cord
4 per 6 months
1 per year
1 per year
Rechargeable batteries (per set of 2)
1 per year
Transmitter cable or cord
4 per 6 months
Adapted from: Wisconsin Department of Health and Family Services, 2005.
CPT Codes / HCPCS Codes / ICD-9 Codes
Auditory Brainstem Implant:
CPT codes covered if criteria are met:
HCPCS codes covered if selection criteria are met:
Implantation of auditory brain stem implant
Other HCPCS codes related to the CPB:
Prosthetic implant, not otherwise specified [auditory brainstem implant]
ICD-9 codes covered if selection criteria are met:
237.70 - 237.79
Disorders of acoustic nerve
CPT codes covered if selection criteria are met:
92507 - 92508
92601 - 92602
92603 - 92604
92626 - 92627
92630 - 92633
Other CPT codes related to the CPB:
69714 - 69715
69717 - 69718
HCPCS codes covered if selection criteria are met:
Cochlear device, includes all internal and external components
Headset/headpiece for use with cochlear implant device, replacement
Microphone for use with cochlear implant device, replacement
Transmitting coil for use with cochlear implant device, replacement
Transmitter cable for use with cochlear implant device, replacement
Transmitting coil and cable, integreated, for use with cochlear implant device, replacement
Other HCPCS codes related to the CPB:
Administration of pneumococcal vaccine
Pneumococcal conjugate vaccine, polyvalent, intramuscular, for children from five to nine years of age who have not previously received the vaccine
Assistive listening device, for use with cochlear implant
ICD-9 codes covered if selection criteria are met:
Sensory hearing loss, bilateral
Neural hearing loss, bilateral
Sensorineural hearing loss, bilateral
Mixed hearing loss, bilateral
Other ICD-9 codes related to the CPB:
Anomalies of inner ear [cochlear aplasia]
The above policy is based on the following references:
Nikolopoulos TP, O'Donoghue GM. Cochlear implantation in adults and children. Hosp Med. 1998;59(1):46-49.
Linstrom CJ. Cochlear implantation. Practical information for the generalist. Prim Care. 1998;25(3):583-617.
Ruth RA. Evaluation of sensorineural hearing loss. Compr Ther. 1997;23(11):742-749.
Syms CA 3rd, House WF. Surgical rehabilitation of deafness. Otolaryngol Clin North Am. 1997;30(5):777-782.
Langman AW, Quigley SM, Souliere CR Jr. Cochlear implants in children. Pediatr Clin North Am. 1996;43(6):1217-1231.
Balkany T, Hodges AV, Luntz M. Update on cochlear implantation. Otolaryngol Clin North Am. 1996;29(2):277-289.
Maniglia AJ. State of the art on the development of the implantable hearing device for partial hearing loss. Otolaryngol Clin North Am. 1996;29(2):225-243.
Gordon KA, Daya H, Harrison RV, Papsin BC. Factors contributing to limited open-set speech perception in children who use a cochlear implant. Int J Pediatr Otorhinolaryngol. 2000;56(2):101-111.
Krabbe PF, Hinderink JB, van den Broek P. The effect of cochlear implant use in postlingually deaf adults. Int J Technol Assess Health Care. 2000;16(3):864-873.
Faber CE, Grontved AM. Cochlear implantation and change in quality of life. Acta Otolaryngol Suppl. 2000;543:151-153.
Waltzman SB, Scalchunes V, Cohen NL. Performance of multiply handicapped children using cochlear implants. Am J Otol. 2000;21(3):329-335.
Alberta Heritage Foundation for Medical Research (AHFMR). Multichannel auditory brainstem implant. TechScan No. 30. Edmonton, AB; AHFMR; 2002. Available at: http://www.ahfmr.ab.ca/hta/hta-publications/techscans/auditory-30-00.rtf. Accessed June 5, 2002.
U.S. Food and Drug Administration (FDA), Center for Devices and Radiologic Health. Nucleus 24 Auditory Brainstem Implant System. PMA No. P000015. Rockville, MD: FDA; updated March 27, 2001.
Institute for Clinical Systems Integration (ICSI). Cochlear implants. Technology Assessment No. 1. Bloomington, MN: ICSI; May 1993. Available at: http://www.icsi.org/ta/T01ar.pdf. Accessed June 24, 2002.
Grayeli AB, Bouccara D, Kalamarides M, et al. Auditory brainstem implant in bilateral and completely ossified cochleae. Otol Neurotol. 2003;24(1):79-82.
Centers for Disease Control and Prevention (CDC). Use of vaccines for the prevention of meningitis in persons with cochlear implants. Fact Sheet for Health Care Professionals. Atlanta, GA: CDC; July 31, 2003 (previously published October 2002). Available at: http://www.cdc.gov/nip/issues/cochlear/cochlear-hcp.htm. Accessed January 9, 2004.
Reefhuis J, Honein MA, Whitney CG, et al. Risk of bacterial meningitis in children with cochlear implants, USA 1997-2002. N Engl J Med. 2003;349(5):435-445.
Centers for Disease Control and Prevention (CDC). Advisory Committee on Immunization Practices. Pneumococcal vaccination for cochlear implant candidates and recipients: Updated recommendations of the Advisory Committee on Immunization Practices. MMWR Morb Mortal Wkly Rep. 2003;52(31):739-740.
Tyler RS, Dunn CC, Witt SA, Preece JP. Update on bilateral cochlear implantation. Curr Opin Otolaryngol Head Neck Surg. 2003;11(5):388-393.
Wilson BS, Lawson DT, Muller JM, et al. Cochlear implants: Some likely next steps. Annu Rev Biomed Eng. 2003;5:207-249.
National Institute for Clinical Excellence (NICE). Auditory brain stem implants. Interventional Procedure Consultation Document. London, UK: NICE; June 2004. Available at: http://www.nice.org.uk/page.aspx?o=118148. Accessed May 26, 2004.
Canadian Coordinating Office of Health Technology Assessment (CCOHTA). Auditory brain stem implants. Pre-assessment No. 36. Ottawa, ON: CCOHTA; June 2004. Available at: http://www.ccohta.ca/. Accessed June 24, 2004.
van Hoesel RJ. Exploring the benefits of bilateral cochlear implants. Audiol Neurootol. 2004;9(4):234-246.
de Vries CS. Cochlear implants in adults. Bazian, Ltd, eds. London, UK: Wessex Institute for Health Research and Development, University of Southampton; 2003:1-12.
National Institute for Clinical Excellence (NICE). Auditory brain stem implants. Interventional Procedure Guidance 108. London, UK: NICE; January 2005.
Papsin BC. Cochlear implantation in children with anomalous cochleovestibular anatomy. Laryngoscope. 2005;115(1 Pt 2 Suppl 106):1-26.
Colletti V, Carner M, Miorelli V, et al. Auditory brainstem implant (ABI): New frontiers in adults and children. Otolaryngol Head Neck Surg. 2005;133(1):126-138.
Tyler RS, Gantz BJ, Rubinstein JT, et al. Three-month results with bilateral cochlear implants. Ear Hear. 2002;23(1 Suppl):80S-89S.
Swedish Council on Technology Assessment in Health Care (SBU). Bilateral cochlear implantation (CI) in children (ALERT). Stockholm, Sweden, SBU; 2006. Available at: http://www.sbu.se/. Accessed February 20, 2007 .
Pichon Riviere A, Augustovski F, Cernadas C, et al. Safety and efficacy of cochlear implants. Technology Assessment. Buenas Aires, Argentina: Institute for Clinical Effectiveness and Health Policy (IECS); September 2003.
Callanan V, Poje C. Cochlear implantation and meningitis. Int J Pediatr Otorhinolaryngol. 2004;68(5):545-550.
American Speech-Language-Hearing Association (ASHA). Working Group on Cochlear Implants. Cochlear Implants. ASHA Technical Report. Rockville, MD: ASHA; 2004:1-35. Available at: http://www.asha.org/NR/rdonlyres/215CC9B8-6831-494F-83ED-E02A6832A8A9/0/24402%A01.pdf. Accessed January 30, 2007.
Kuhn-Inacker H, Shehata-Dieler W, Muller J, Helms J. Bilateral cochlear implants: A way to optimize auditory perception abilities in deaf children? Int J Pediatr Otorhinolaryngol. 2004;68:1257-1266.
Laszig R, Aschendorff A, Stecker M, et al. Benefits of bilateral electrical stimulation with the nucleus cochlear implant in adults: 6-month postoperative results. Otol Neurotol. 2004;25:958-968.
Litovsky RY, Johnstone PM, Godar S. Benefits of bilateral cochlear implants and/or hearing aids in children. Int J Audiol. 2006;45 (Suppl):78-91.
Litovsky RY, Johnstone PM, Godar S. Bilateral cochlear implants in children: Localization acuity measured with minimum audible angle. Ear Hear. 2006;27:43-59.
Au DK, Hui Y, Wei WI. Superiority of bilateral cochlear implantation over unilateral cochlear implantation in tone discrimination in Chinese patients. Am J Otolaryngol. 2003;24:19-23.
Dunn CC, Tyler RS, Witt SA, Gantz BJ. Effects of converting bilateral cochlear implant subjects to a strategy with increased rate and number of channels. Ann of Oto Rhinol Laryngol. 2006.115:425-432.
Gantz BJ, Tyler RS, Rubenstein JT, et al. Binaural cochlear implants placed during the same operation. Otol Neurotol. 2002;23(2):169-180.
Litovsky RY, Parkinson A, Arcaroli J, Peters R. Bilateral cochlear implants in adults and children. Arch Otolaryngol Head Neck Surg. 2004;130:648-655.
Muller J, Schön F, Helms J, et al. Speech understanding in quiet and noise in bilateral users of the MED-EL COMBI 40/40+ cochlear implant system. Ear Hear. 2002;23:198-206.
Nopp P, Schleich P, D’Haese P. Sound localization in bilateral users of MED-EL COMBI 40/40+ cochlear implants. Ear Hear. 2004;25:205-214.
Ramsden R, Greenham P, O’Driscoll M, Mawman D. Evaluation of bilaterally implanted adult subjects with the Nucleus 24 cochlear implant system. Otol Neurotol. 2005; 26(5):988-998.
Schleich P, Nopp P, D’Haese P. Head shadow, squelch, and summation effects in bilateral users of the MED-EL COMBI 40/40+ cochlear implant. Ear Hear. 2004;25:197-204.
Schön F, Müller J, Helms J, Nopp P. Sound localization and sensitivity to interaural cues in bilateral users of the Med-El Combi 40/40+cochlear implant system. Otol Neurotol. 2005;26:429-437.
Schön F, Müller J, Helms J. Speech reception thresholds obtained in a symmetrical four-loudspeaker arrangement from bilateral users of MED-EL cochlear implants. Otol Neurotol. 2002; 23:710-714.
Seeber BU, Baumann U, Fastl H. Localization ability with bimodal hearing aids and bilateral cochlear implants. J Acoust Soc Am. 2004;116(3):1698-1709.
Senn P, Kompis M, Vischer M, Haeusler R. Minimum audible angle, just noticeable interaural differences and speech intelligibility with bilateral cochlear implants using clinical speech processors. Audiol Neurootol. 2005;10:342-352.
Quentin Summerfield A, Barton GR, Toner J, et al. Self-reported benefits from bilateral cochlear implantation in post-lingually deafened adults: Randomised controlled trial. Int J Audiol. 2006;45:1-9.
Verschuur CA, Lutman M, Ramsden R, et al. Auditory localization abilities in bilateral cochlear implant recipients. Otol Neurotol. 2005;26:965-971.
van Hoesel RJ, Tyler RS. Speech perception, localization, and lateralization with bilateral cochlear implants. J Acoust Soc Am. 2003;113:1617-1630.
Neuman AC, Haravon A, Sislian N, Waltzman SB. Sound-direction identification with bilateral cochlear implants. Ear Hear. 2007;28(1):73-82.
Schafer EC, Thibodeau LM. Speech recognition in noise in children with cochlear implants while listening in bilateral, bimodal, and FM-system arrangements. Am J Audiol. 2006;15(2):114-126.
Ricketts TA, Grantham DW, Ashmead DH, et al. Speech recognition for unilateral and bilateral cochlear implant modes in the presence of uncorrelated noise sources. Ear Hear. 2006;27(6):763-773.
Litovsky R, Parkinson A, Arcaroli J, Sammeth C. Simultaneous bilateral cochlear implantation in adults: A multicenter clinical study. Ear Hear. 2006;27(6):714-731.
Bauer PW, Sharma A, Martin K, Dorman M. Central auditory development in children with bilateral cochlear implants. Arch Otolaryngol Head Neck Surg. 2006;132(10):1133-1136.
Long CJ, Carlyon RP, Litovsky RY, Downs DH. Binaural unmasking with bilateral cochlear implants. J Assoc Res Otolaryngol. 2006;7(4):352-360.
Tyler RS, Noble W, Dunn C, Witt S. Some benefits and limitations of binaural cochlear implants and our ability to measure them. Int J Audiol. 2006;45 Suppl 1:S113-S119.
National Health Service (NHS), Bassetlaw Primary Care Trust. Policy on the Commissioning of Cochlear Implants. Reference: PCT CM 35. Barnsley, UK: NHS Bassetlaw Primary Care Trust; revised March 2006.
Australian Association of the Deaf Inc. Policy on cochlear implants. Policies. Brisbane, Australia: Australian Association of the Deaf; November 3, 2006. Available at: http://www.aad.org.au/info/policy_cochlear.php. Accessed June 19, 2007.
Wackym PA, Runge-Samuelson CL, Firszt JB, et al. More challenging speech-perception tasks demonstrate binaural benefit in bilateral cochlear implant users. Ear Hear. 2007;28(2 Suppl):80S-85S.
Peters BR, Litovcsky R, Parkinson A, Lake J. Importance of age and postimplantation experience on speech perception measures in children with sequential bilateral cochlear implants. Otol Neurotol. 2007;28(5):649-657.
Beijen JW, Snik AF, Mylanus EA. Sound localization ability of young children with bilateral cochlear implants. Otol Neurotol. 2007;28(4):479-485.
Tyler RS, Dunn CC, Witt SA, Noble WG. Speech perception and localization with adults with bilateral sequential cochlear implants. Ear Hear. 2007;28(2 Suppl):86S-90S.
Portmann D, Felix F, Negrevergne M, et al. Bilateral cochlear implantation in a patient with long-term deafness. Rev Laryngol Otol Rhinol (Bord). 2007;128(1-2):65-68.
Galvin KL, Mok M, Dowell RC. Perceptual benefit and functional outcomes for children using sequential bilateral cochlear implants. Ear Hear. 2007;28(4):470-482.
Grantham DW, Ashmead DH, Ricketts TA, et al. Horizontal-plane localization of noise and speech signals by postlingually deafened adults fitted with bilateral cochlear implants. Ear Hear. 2007;28(4):524-541.
Smith ZM, Delgutte B. Sensitivity to interaural time differences in the inferior colliculus with bilateral cochlear implants. J Neurosci. 2007;27(25):6740-6750.
Gordon KA, Valero J, Papsin BC. Binaural processing in children using bilateral cochlear implants. Neuroreport. 2007;18(6):613-617.
Murphy J, O'Donoghue G. Bilateral cochlear implantation: An evidence-based medicine evaluation. Laryngoscope. 2007;117:1412-1418.
Ching TY, van Wanrooy E, Dillon H. Binaural-bimodal fitting or bilateral implantation for managing severe to profound deafness: A review. Trends Amplif. 2007;11(3):161-192.
National Institute for Health and Clinical Excellence (NICE). Cochlear implants for children and adults with severe to profound deafness. Appraisal Consultation Document. London, UK: NICE; December 2007.
U.S. Food and Drug Administration (FDA). FDA public health notification: Importance of vaccination in cochlear implant recipients. Rockville, MD: FDA; October 10, 2007. Available at: http://www.fda.gov/cdrh/safety/101007-cochlear.html. Accessed January 5, 2008.
Ali W, O'Connell R. The effectiveness of early cochlear implantation for infants and young children with hearing loss. NZHTA Technical Brief Series. Christchurch, New Zealand: New Zealand Health Technology Assessment (NZHTA); 2007.
Wisconsin Department of Health and Family Services. Replacement parts for cochlear implants and bone-anchored hearing devices. Attachment 3. Wisconsin Medicaid and BadgerCare Update. No. 2005-20. Madison, WI; Wisconsin Department of Health and Family Services; March 2005. Available at: http://dhs.wisconsin.gov/medicaid/updates/2005/2005pdfs/2005-20.pdf. Accessed August 25, 2008.
Schwartz MS, Otto SR, Shannon RV, et al. Auditory brainstem implants. Neurotherapeutics. 2008;5(1):128-136.
Papsin BC, Gordon KA. Bilateral cochlear implants should be the standard for children with bilateral sensorineural deafness. Curr Opin Otolaryngol Head Neck Surg. 2008;16(1):69-74.
Bichey BG, Miyamoto RT. Outcomes in bilateral cochlear implantation. Otolaryngol Head Neck Surg. 2008;138(5):655-661.
Centers for Medicare & Medicaid Services (CMS). Hearing aids and auditory implants. Medicare Benefit Policy Manual, Ch. 16 - General Exclusions from Coverage, Sec. 100 (Rev. 39; Issued: 11-10-05; Effective: 11-10-05; Implementation: 12-12-05). Baltimore, MD: CMS; 2005. Available at: http://www.cms.hhs.gov/manuals/downloads/bp102c16.pdf. Accessed January 6, 2008.
National Institute for Health and Clinical Excellence (NICE). Cochlear implants for children and adults with severe to profound deafness. NICE Technology Appraisal Guidance 166. London, UK: NICE; January 2009.
Elvsåshagen T, Solyga V, Bakke SJ, et al. Neurofibromatosis type 2 and auditory brainstem implantation. Tidsskr Nor Laegeforen. 2009;129(15):1469-1473.
Bond M, Elston J, Mealing S, et al. Effectiveness of multi-channel unilateral cochlear implants for profoundly deaf children: A systematic review. Clin Otolaryngol. 2009;34(3):199-211.
Bond M, Mealing S, Anderson R, et al. The effectiveness and cost-effectiveness of cochlear implants for severe to profound deafness in children and adults: A systematic review and economic model. Health Technol Assess. 2009;13(44):1-330.
Vlastarakos PV, Proikas K, Papacharalampous G, et al. Cochlear implantation under the first year of age -- the outcomes. A critical systematic review and meta-analysis. Int J Pediatr Otorhinolaryngol. 2010a;74(2):119-126.
Vlastarakos PV, Candiloros D, Papacharalampous G, et al. Diagnostic challenges and safety considerations in cochlear implantation under the age of 12 months. Int J Pediatr Otorhinolaryngol. 2010b;74(2):127-132.
Raman G, Lee J, Chung M, et al. Effectiveness of cochlear implants in adults with sensorineural hearing loss. Technology Assessment Report. Prepared by the Tufts Evidence-based Practice Center for the Agency for Healthcare Research and Quality (AHRQ). Project ID: AUDT0501. Rockville, MD: AHRQ; June 17, 2011.
Niparko JK, Tobey EA, Thal DJ, et al; CDaCI Investigative Team. Spoken language development in children following cochlear implantation. JAMA. 2010;303(15):1498-1506.
Lovett RE, Kitterick PT, Hewitt CE, Summerfield AQ. Bilateral or unilateral cochlear implantation for deaf children: An observational study. Arch Dis Child. 2010;95(2):107-112.
Leigh J, Dettman S, Dowell R, Sarant J. Evidence-based approach for making cochlear implant recommendations for infants with residual hearing. Ear Hear. 2011;32(3):313-322.
Copyright Aetna Inc. All rights reserved. Clinical Policy Bulletins are developed by Aetna to assist in administering plan benefits and constitute neither offers of coverage nor medical advice. This Clinical Policy Bulletin contains only a partial, general description of plan or program benefits and does not constitute a contract. Aetna does not provide health care services and, therefore, cannot guarantee any results or outcomes. Participating providers are independent contractors in private practice and are neither employees nor agents of Aetna or its affiliates. Treating providers are solely responsible for medical advice and treatment of members. This Clinical Policy Bulletin may be updated and therefore is subject to change.