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Aetna Aetna
Clinical Policy Bulletin:
Bone-Anchored Hearing Aid
Number: 0403


Policy

  1. Aetna considers implantable bone-anchored hearing aids (BAHAs) or temporal bone stimulators medically necessary prosthetics for persons aged 5 years and older with a unilateral or bilateral conductive or mixed conductive and sensorineural hearing loss who have any of the following conditions, where the condition prevents restoration of hearing using a conventional air-conductive hearing aid and who meet the audiologic criteria below:

    1. Congenital or surgically induced malformations of the external ear canal or middle ear (such as aural atresia); or
    2. Dermatitis of the external ear, including hypersensitivity reactions to ear moulds used in air conduction hearing aids; or
    3. Hearing loss secondary to otosclerosis in persons who can not undergo stapedectomy; or
    4. Severe chronic external otitis or otitis media; or
    5. Tumors of the external ear canal and/or tympanic cavity; or
    6. Other conditions in which an air-conduction hearing aid is contraindicated.

    Audiologic criteria:

    1. Unilateral implant: Conductive or mixed (conductive and sensorineural) hearing loss with pure tone average bone conduction threshold (measured at 0.5, 1, 2, and 3 kHz) less than or equal to 45 dB HL (BAHA Divino, BAHA BP100), 55 dB HL (BAHA Intenso, Cochlear Baha 3 Power [BP110]) or 65 dB HL (BAHA Cordelle II).
    2. Bilateral implant: Moderate-to-severe bilateral symmetric conductive or mixed (conductive and sensorineural) hearing loss, meeting above-listed bone conduction thresholds in both ears.  Symmetric bone conduction threshold is defined as less than:

      1. 10 dB average (measured at 0.5, 1, 2 and 4 kHz) or less than 15 dB at individual frequencies (BAHA Divino, BAHA BP100); or 
      2. 10 dB average difference between ears (measured at 0.5, 1, 2, and 3 kHz), or less than a 15 dB difference at individual frequencies (BAHA Cordelle II, BAHA Intenso).

  2. Aetna considers an implantable BAHA for conductive or mixed hearing loss experimental and investigational when criteria are not met because of insufficient evidence in the peer-reviewed published medical literature.

  3. Aetna considers the use of an implantable BAHA medically necessary in persons with unilateral sensorineural hearing loss (single-sided deafness, i.e., deafness in one ear while the other ear has normal hearing).  Aetna considers the use of an implantable BAHA experimental and investigational for bilateral pure sensorineural hearing loss, and for all other indications becuase its effectiveness for indications other than the ones listed above has not been established.

  4. Aetna considers intra-oral bone conduction hearing aids (e.g., the SoundBite hearing system) for the treatment of hearing loss experimental and investigational becuase their effectiveness have not been established.

  5. Aetna considers partially implantable bone conduction hearing systems using magnetic coupling for acoustic transmission (e.g., the Otomag Alpha 1(M) bone conduction hearing system) for the treatment of hearing loss experimental and investigational becuase their effectiveness have not been established.

Note: Aetna follows Medicare rules in considering osseointegrated implants, such as implantable BAHAs and temporal bone stimulators, as prosthetics.  Medicare considers as prosthetics "osseointegrated implants, i.e., devices implanted in the skull that replace the function of the middle ear and provide mechanical energy to the cochlea via a mechanical transducer." Non-osseointegrated hearing devices (e.g., BAHA Soft Band, SoundBite) are not covered under plans that exclude coverage of hearing aids. Please check benefit plan descriptions.

See also CPB 0013 - Cochlear Implants and Auditory Brainstem Implants; and CPB 0612 - Implantable Hearing Aids.



Background

The bone-anchored hearing aid (BAHA) is a bone-conduction hearing aid that allows direct bone-conduction through a titanium implant and has become available as an acceptable alternative if an air-conduction hearing aid is contraindicated.  The BAHA transmits sound vibrations through the skull bone via a skin-penetrating titanium implant, and then are further transmitted to the cochlea, bypassing the middle ear.  Several clinical trials have shown its efficacy in patients with a conductive or mixed hearing loss.  Indications for the BAHA include hearing loss from congenital ear problems, chronic suppurative otitis media, and in some cases otosclerosis as a third treatment option in those who can not or will not undergo stapedectomy.  A second group of potential candidates are patients who suffer from an almost instantaneous skin reaction to any kind of ear mold.  In some patients, the benefits are not necessarily those in hearing ability but relate to cosmetic or comfort improvements.  Pre-operative assessment of the size of the air-bone gap is of some help to predict whether speech recognition may improve or deteriorate with the BAHA compared with the air-conduction hearing aid.

There is evidence in the peer-reviewed published medical literature to support the use of BAHAs over air conduction hearing aids, however, most of the studies have focused on individuals who suffer from single sided deafness, with unilateral sensorineural deafness in one ear while the other ear has normal hearing.  The Food and Drug Administration (FDA) has cleared for marketing the bone anchored hearing aid for individuals aged 5 years and older who have conductive or mixed hearing loss and for patients with sensorineural deafness in one ear and normal hearing in the other based on a 510(k) application.  Such clearance was granted based on a determination that the BAHA was substantially equivalent to a contralateral routing of sound (CROS) air conduction hearing aid.  A unilateral implant is used for individuals with unilateral conductive or mixed hearing loss and for unilateral sensorineural hearing loss.  According to the FDA-approved indications, a bilateral implant is intended for patients with bilaterally symmetric moderate to severe conductive or mixed hearing loss.
In a recently published meta-analysis of the evidence for BAHA for single-sided deafness, Baguley and colleagues (2006) explained that acquired unilateral sensorineural hearing loss reduces the ability to localize sounds and to discriminate in background noise.  Four controlled trials have been conducted to determine the benefit of contralateral BAHAs over CROS hearing aids and over the unaided condition.  Speech discrimination in noise and subjective questionnaire measures of auditory abilities showed an advantage for BAHA over CROS and over unaided conditions.  However, these studies did not find significant improvements in auditory localization with either aid.  The investigators noted that these conclusions should be interpreted with caution because these studies have material shortfalls: (i) the BAHA was always trialled after the CROS aid; (ii) CROS aids were only trialled for 4 weeks; (iii) none used any measure of hearing handicap when selecting subjects; (iv) 2 studies have a bias in terms of patient selection; (v) all studies were under-powered; and (vi) double reporting of patients occurred (Baugley et al, 2006).

Priwin et al (2007) investigated (i) whether bilateral BAHAs in children with conductive bilateral hearing loss provided additional hearing benefits, (ii) the effects of unilateral hearing aids in children with conductive unilateral hearing loss, and (iii) the auditory problems of children with conductive unilateral or bilateral hearing loss.  This prospective case series included 22 children with either conductive unilateral hearing loss (unaided or with unilateral hearing aid) or conductive bilateral hearing loss (with unilateral or bilateral BAHAs) and 15 controls.  The investigators tested baseline audiometry, tone thresholds in a sound field, and speech recognition in noise and sound localization with and without unilateral and bilateral hearing aids.  Two self-assessment questionnaires were completed.  The investigators reported 2 problem areas in the children with hearing impairment: (i) reactions to sounds, and (ii) intelligibility of speech.  An additional BAHA in the children with bilateral hearing loss resulted in a tendency to have improved hearing in terms of better sound localization and speech recognition in noise.  Fitting of unilateral hearing aids in the children with unilateral hearing loss gave some supplementary benefit in terms of better speech recognition in noise but no positive effect on ability to localize sound could be detected.  Even so, all children fitted with hearing aids, either unilaterally or bilaterally, reported a positive outcome with their devices in the self-assessment questionnaire.  The investigators concluded that the fitting of bilateral BAHAs in children with bilateral hearing loss and of a single-sided hearing aid in children with unilateral hearing loss appears to have some supplementary audiological benefits and also renders high patient satisfaction.

When suggested indications for treatment with the BAHA system are followed, the success rate is very high.  The improved quality of life reported by the patients is a combination of improved quality of sound (warble tone threshold, speech reception threshold, and discrimination in noise), improved comfort, and relief from middle ear and ear canal disease occasioned by conventional hearing aids.

An assessment of the BAHA device by the Institute for Clinical Effectiveness and Health Policy (Pichon-Rivere et al, 2009) concluded that there is evidence that BAHA is useful for people with conductive-type hearing loss who can not undergo surgery or who have contraindications or adverse effects to hearing aids.  If implantation is used, it should be implanted to patients over 5 years old and by specially trained staff in an operating room.  Evidence comes, however, from observational studies, many of which include a few participants.

Although no longer marketed, the Audiant (Medtronic Xomed, Inc., Jacksonville, FL) Bone Conductor, also known as the temporal bone stimulator, is an FDA-approved implanted device with an external processor that uses transcutaneous inductive electromagnetic energy to cause vibration of an implanted titanium magnet screwed into the temporal bone.  Like the currently marketed BAHA device, the Audiant Bone Conductor is also based on a bone conduction concept, and is also indicated for persons with conductive or mixed conductive and sensorineural hearing loss who have conditions that prevent restoration of hearing using a conventional air-conductive hearing aid.

Hol et al (2010) evaluated the effectiveness of 3 CROS hearing aids in adults (n = 10 with unilateral inner ear deafness and normal hearing in the contralateral ear: (i) the CROS hearing aid, (ii) the completely in the canal hearing aid, and (iii) the BAHA CROS (BAHA).  Each of the 3 hearing aids was tried in a random order for a period of 8 weeks.  Audiometric performance, including speech-in-noise, directional hearing and subjective benefit were measured after each trial period, using the Abbreviated Profile of Hearing Aid Benefit (APHAB), SSQ and single-sided deafness questionnaire.  Sound localization performance was essentially at chance level in all 4 conditions.  Mixed results were seen on the other patient outcome measures that alternated in favor of one of the 3 CROS devices.  After the trial, 3 patients chose to be fitted with the BAHA CROS and 1 with the conventional CROS.  The authors concluded that most of the patients experienced some degree of benefit with each of the 3 hearing aids.  Preference for one of the 3 hearing aids was independent of the order in which they were tried.  It would be worthwhile to formulate selection criteria; still, the authors recommended that all patients with unilateral inner ear deafness should be offered a trial with at least the BAHA CROS.

de Wolf and colleagues (2011a) stated that a study performed in the 1990s with analog linear hearing aids showed that in patients with mixed hearing loss and an air-bone gap that exceeded 25 to 30 dB, speech perception was better with a BAHA than with a conventional behind-the-ear (BTE) device.  The objective of the present study was to examine if this conclusion applies to today's digital BTEs with feedback cancellation and whether the cross-over point still occurs at an air-bone gap of 25 to 30 dB.  Experienced unilateral BAHA users with the latest digital Baha processors were fitted with a powerful BTE with feedback cancellation.  After an acclimatization period of 4 weeks, aided thresholds and speech recognition scores were determined and compared to those recorded previously with the BAHA.  To obtain patients' opinions, a disability-specific questionnaire was used. Participants comprised 16 subjects with bilateral mixed hearing loss.  Audiometric and speech recognition data showed similar trends to those described previously, but the cross-over point had shifted to an air-bone gap of 30 to 35 dB.  In the questionnaire, the BTE was rated higher than the BaHA, except by the patients with an air-bone gap that exceeded an average of 45 dB.  The authors concluded that in patients with mixed hearing loss whose air-bone gap exceeded 35 dB, speech recognition is likely to be better with a BAHA than with a BTE.  Thus, the BAHA should receive greater consideration when mixed hearing loss is combined with a significant air-bone gap, even when there are no contraindications for BTEs.

de Wolf and colleagues (2011b) evaluated the benefits of a BAHA in the daily lives of hearing-impaired children.  A total of 38 BAHA users with a minimum age of 4 years at BAHA fitting and 1 to 4 years of use were divided into groups with bilateral conductive or mixed hearing loss and either normal cognition or mental disability and a group with unilateral conductive hearing loss.  Main outcome measures included scores on the Glasgow Children's Benefit Inventory, APHAB, and Health Utilities Index Mark 3.  The Glasgow Children's Benefit Inventory showed a subjective overall benefit of +32, +16, and +26 in the 3 groups (on a scale of -100 to +100).  The APHAB also showed an overall mean benefit in the groups.  On an individual level, a clinically significant benefit was reported by more children in the group with bilateral hearing loss and normal cognition (7 patients [70 %]) than in the unilateral hearing loss group (4 patients [27 %]).  Overall mean health utility scores and disability index scores on the Health Utility Index Mark 3 were comparable among the 3 groups.  The authors concluded that overall, BAHA fitting can be considered effective and beneficial in children with bilateral or unilateral hearing loss.

The SoundBite hearing system (Sonitus Medical, San Mateo, CA) allows people with single-sided deafness (SSD) to wear an intra-oral device and a small microphone in the deaf ear to regain lost hearing.  A piezoelectric activator in a small removable unilateral oral appliance conducts sound through the bone via the teeth to the good ear.  Currently, there is insufficient evidence to support the use of an intra-oral bone conduction hearing aid for the treatment of hearing loss.  The quality of the studies was low due to small study populations, short follow-up, and the lack of randomization and appropriate control groups.  Future studies with larger populations of patients wearing the device for longer periods are needed to evaluate hearing benefits and device safety.

Popelka et al (2010) stated that a new approach for SSD has been proposed that optimizes microphone location and delivers sound by bone conduction through a removable oral appliance.  Measures in the laboratory using normal-hearing subjects indicated that the device provides useful gain and output for SSD patients, is comfortable, does not seem to have detrimental effects on oral function or oral health, and has several advantages over existing devices.  Specifically, microphone placement is optimized for reducing the auditory deficit caused by SSD, frequency bandwidth is much greater, and the system does not require surgical placement.  Auditory performance in a small sample of SSD subjects indicated a substantial advantage compared with not wearing the device.  The authors noted that future studies will involve performance measures on SSD patients wearing the device for longer periods.

Murray et al (2011a) determine the benefit, safety and effectiveness, of a new intra-oral conduction device (SoundBite Hearing System) for SSD.  Adults (aged between greater than 18 and less than 80 years) with acquired, permanent SSD (n = 28) and no current use of any SSD device were included in this study.  Intervention was continual daily wear of the new device over a 30-day trial period.  Main outcome measures included the Hearing in Noise Test (HINT), the Abbreviated Profile of Hearing Aid Benefit (APHAB), comprehensive pre-trial and post-trial medical, audiologic, and dental examinations and an SSD questionnaire.  The Hearing in Noise Test scores improved an average of -2.5 dB after 30 days, compared with wearing no device (p < 0.001).  The Abbreviated Profile of Hearing Aid Benefit scores improved (p < 0.05) for all subjects for the Global and Background Noise subscales and for all but 1 subject for the Reverberation and Ease of Communication subscales.  There were no medical, audiologic, or dental complications.  The authors concluded that the SoundBite system is safe and effective and provided substantial benefit for SSD patients with continual daily use over a 30-day period.

Murray et al (2011b) determined the long-term safety and benefit of the SoundBite Hearing System for SSD.  Adults (n = 22) with acquired, permanent SSD and no current use of any other SSD device were included in this study.  Main outcome measures included comprehensive medical, audiologic, and dental measures; aided thresholds; Abbreviated Profile of Hearing Aid Benefit scores, and an SSD questionnaire.  There were no related adverse events or changes in the medical or audiologic findings at the end of the trial compared with the beginning.  There were no significant changes in the mean aided thresholds (p > 0.01) or the mean dental measures (p > 0.05) at 3 or 6 months compared with pre-trial measures.  The mean Abbreviated Profile of Hearing Aid Benefit scores showed improvement (p < 0.01) for the Background Noise, Reverberation, and Ease of Communication subscales and the Global scale at 3 and 6 months.  The results of the SSD questionnaire indicated that the vast majority (greater than 90 %) of the subjects reported satisfaction and improvement in a variety of areas after wearing the device long-term.  The authors concluded that the SoundBite system is safe and continues to provide substantial benefit for SSD patients with continual daily use over a 6-month period.

The Otomag bone conduction hearing system (Sophono, Inc., Boulder, CO) is a partially implantable bone conduction hearing aid without a percutaneous abutment.  The Otomag sound processor is attached magnetically to an implanted magnet assembly.  The magnetic field holds the sound processor against the head and vibration is transduced through direct contact with the patient's skin and the bone below.  The principle of these bone conduction hearing aids is a magnetic coupling and acoustic transmission between implanted and external magnets.  Currently, there is insufficient evidence that the Otomag bone conduction hearing system is beneficial for patients with hearing loss.  Further investigation with larger populations and long-term follow-up are needed to evaluate improvement of hearing with this device.

Siegert (2011) developed new partially implantable bone conduction hearing aid without a percutaneous abutment and have been using them clinically for 4 years.  The goal of this study was to evaluate clinical and audiological results.  Magnets were implanted into shallow bone beds in a 1-step procedure.  The skin area above the magnets was also reduced to a thickness of 4 to5 mm, which reduces the attenuation to less than 10 dB compared to direct bone stimulation.  Over 100 patients have been implanted in the last 5 years.  Except for temporary pressure marks in 4 %, which healed after careful shimming of the external base plate, there were no other complications.  The author concluded that the holding strength of the external components is equivalent to partially implantable hearing aids and cochlea implants and the hearing improvement is similar to other bone conduction hearing aids.  The author noted that the comfort and safety of this system is significantly improved compared to conventional or percutaneous bone conduction hearing aids.  The main drawback of this study was the lack of a control group.  These preliminary findings need to be validated by well-designed studies.

Kiringoda and Lustig (2013) summarized available peer-reviewed literature to describe the range and rate of complications related to osseo-integrated hearing aids in adult and pediatric patients.  These investigators searched PubMed using the terms bone-anchored hearing aid for articles published in English between 2000 and 2011.  They included all articles reporting complications rates, except those that were case reports, general review (not systematic review), or commentary, as well as those that did not include patient outcomes, that reported outcomes associated with non-standard implantation (e.g., 8.5-mm abutment) or were of poor study or reporting quality.  After excluding articles that did not meet criteria, a total of 20 articles were identified, comprising 2,134 patients who underwent a total of 2,310 osseo-implants.  Complications reported in the literature were typically minor in nature.  Skin reactions from Holgers Grade 2 to 4 ranged from 2.4 % to 38.1 %.  Failure of osseo-integration ranged from 0 % to 18 % in adult and mixed populations, and 0 % to 14.3 % in pediatric populations.  The rate of revision surgery ranges from 1.7 % to 34.5 % in adult and mixed populations and 0.0 % to 44.4 % in pediatric patients, whereas the total rate of implant loss ranged from 1.6 % to 17.4 % in adult and mixed populations and from 0.0 % to 25 % in pediatric patients.  The authors concluded that overall, the quality of large scale and/or prospective studies reporting the incidence of complications after osseo-integrated hearing aid surgery is poor and lacks uniformity.  However, based on available data, which shows a lack of major complications, osseo-integrated implantation is a safe procedure in both adult and pediatric populations.  Moreover, they stated that well-designed, prospective studies with uniform reporting standards would allow greater comparison between techniques and more reliable analysis of complications of osseo-integration surgery of the temporal bone for cochlear stimulation.

Appendix

Table: Usual medically necessary frequency of replacement for BAHA parts

Replacement Parts  Life Expectancy
Batteries 72 per 6 months
Headband 1 per year
Processor 1 per 5 years

Adapted from: Wisconsin Department of Health and Family Services, 2005.

 
CPT Codes / HCPCS Codes / ICD-9 Codes
CPT codes covered if selection criteria are met:
69710
69711
69714
69715
69717
69718
Other CPT codes related to the CPB:
69550 - 69554
69660 - 69662
92521
92522
92523
92524
92551 - 92557, 92558, 92567 - 92569, 92579, 92582 - 92587
92626 - 92627
92630 - 92633
HCPCS codes covered if selection criteria is met:
L8690 Auditory osseointegrated device, includes all internal and external components
L8691 Auditory osseointegrated device, external sound processor, replacement
L8693 Auditory osseointegrated device abutment, any length, replacement only
Other HCPCS codes related to the CPB:
G0153 Services performed by a qualified speech-language pathologist in the home health or hospice setting, each 15 minutes
L8692 Auditory osseointegrated device, external sound processor, used without osseointegration, body worn, includes headband or other means of external attachment [excluded under plans that exclude coverage of hearing aids]
S9128 Speech therapy, in the home, per diem
V5008 - V5299 Hearing services
ICD-9 codes covered if selection criteria are met:
160.1 Malignant neoplasm of auditory tube, middle ear, and mastoid air cells
171.0 Malignant neoplasm of head, face and neck
173.2 Malignant neoplasm of skin of ear and external auditory canal
212.0 Benign neoplasm of nasal cavities, middle ear, and accessory sinuses
215.0 Benign neoplasm of head, face, and neck
216.2 Benign neoplasm of ear and external auditory canal
232.2 Carcinoma in situ of ear and external auditory canal
380.32 Acquired deformities of auricle or pinna [surgically induced malformations of external ear canal or middle ear]
381.10 Chronic serous otitis media, simple or unspecified [severe]
381.20 Chronic mucoid otitis media [severe]
381.3 Other and unspecified chronic nonsuppurative otitis media [severe]
382.2 Chronic atticoantral suppurative otitis media [severe]
382.3 Unspecified chronic suppurative otitis media [severe]
382.9 Unspecified otitis media [chronic severe]
387.0 - 387.9 Otosclerosis [causing hearing loss in persons who cannot undergo stapedectomy]
389.00 - 389.08 Conductive hearing loss
389.15 Sensorineural hearing loss, unilateral
389.20 - 389.22 Mixed conductive and sensorineural hearing loss
691.8 Other atopic dermatitis and related conditions
692.0 - 692.6, 692.81
692.83 - 692.9
Contact dermatitis and other eczema [external ear/hypersensitivity reactions]
744.02 Other anomalies of external ear with impairment of hearing [congenital malformations of external ear canal]
744.03 Anomaly of middle ear, except ossicles [congenital malformations of middle ear]
744.04 Anomalies of ear ossicles [congenital malformations of middle ear]
744.3 Unspecified anomaly of ear [congenital malformations of external ear canal or middle ear]
ICD-9 codes not covered for indications listed in the CPB:
389.10 - 389.14, 389.16 - 389.18 Sensorineural hearing loss [other than unilateral]
SoundBite Hearing System [e.g., intra-oral bone conduction hearing aids] [excluded under plans that exclude coverage of hearing aids]:
No specific code
ICD-9 codes not covered for indications listed in the CPB:
389.00 - 389.9 Hearing loss
Otomag Alpha 1(M) Bone Conduction Hearing System [e.g., partially implantable bone conduction hearing systems]:
No specific code
ICD-9 codes not covered for indications listed in the CPB:
389.00 - 389.9 Hearing loss


The above policy is based on the following references:
  1. Hakansson BE, Carlsson PU, Tjellstrom A, et al. The bone-anchored hearing aid: Principal design and audiometric results. Ear Nose Throat J. 1994;73(9):670-675.
  2. Tjellstrom A, Hakansson B. The bone-anchored hearing aid. Design principles, indications, and long- term clinical results. Otolaryngol Clin North Am. 1995;28(1):53-72.
  3. Snik AF, Mylanus EA, Cremers CW. Bone-anchored hearing aids in patients with sensorineural hearing loss and persistent otitis externa. Clin Otolaryngol. 1995;20(1):31-35.
  4. Browning GG, Gatehouse S. Estimation of the benefit of bone-anchored hearing aids. Ann Otol Rhinol Laryngol. 1994;103(11):872-878.
  5. Cooper HR, Burrell SP, Powell RH, et al. The Birmingham bone anchored hearing aid programme: Referrals, selection, rehabilitation, philosophy and adult results. J Laryngol Otol Suppl. 1996;21:13-20.
  6. Niehaus HH, Helms J, Muller J. Are implantable hearing devices really necessary? Ear Nose Throat J. 1995;74(4):271-274, 276.
  7. Powell RH, Burrell SP, Cooper HR, et al. The Birmingham bone anchored hearing aid programme: Paediatric experience and results. J Laryngol Otol Suppl. 1996;21:21-29.
  8. Burrell SP, Cooper HC, Proops DW. The bone anchored hearing aid--the third option for otosclerosis. J Laryngol Otol Suppl. 1996;21:31-37.
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  10. Granstrom G, Tjellstrom A. The bone-anchored hearing aid (BAHA) in children with auricular malformations. Ear Nose Throat J. 1997;76(4):238-240, 242, 244-247.
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  14. Snik AF, Mylanus EA, Cremers CW. The bone-anchored hearing aid: A solution for previously unresolved otologic problems. Otolaryngol Clin North Am. 2001;34(2):365-372.
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  19. National Deaf Children's Society (NDCS). Quality standards in bone anchored hearing aids for children and young people. London, UK: NDCS; July 2003.
  20. U.S. Food and Drug Administration (FDA). Branemark Bone Anchored Hearing Aid (BAHA). Summary of Safety and Effectiveness. 510(k) No. K021837. Rockville, MD: FDA; June 1, 2002.
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  26. Ontario Ministry of Health and Long-Term Care, Medical Advisory Secretariat. Bone anchored hearing aid (BAHA). Health Technology Scientific Literature Review. Toronto, ON: Ontario Ministry of Health and Long-Term Care; September 2002. Available at: http://www.health.gov.on.ca/english/providers/program/. Accessed August 4, 2004.
  27. Priwin C, Granstrom G. The bone-anchored hearing aid in children: A surgical and questionnaire follow-up study. Otolaryngol Head Neck Surg. 2005;132(4):559-565.
  28. Hol MK, Snik AF, Mylanus EA, Cremers CW. Does the bone-anchored hearing aid have a complementary effect on audiological and subjective outcomes in patients with unilateral conductive hearing loss? Audiol Neurootol. 2005;10(3):159-168.
  29. UK National Health Service (NHS), National Library for Health. Knowledge update: Hearing aid provision and rehabilitation. Specialist Library for ENT and Audiology. London, UK: NHS; April 2006. Available at: www.library.nhs.uk/SpecialistLibraries/ Download.aspx?resID=124002. Accessed May 30, 2006.
  30. Bergeron F.  Bone-anchored hearing aid. AETMIS 06-05. Summary. Montreal, QC: Agence D’Evaluation des Technologies et des Modes D’Intervention en Santé (AETMIS); May 2006.
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  33. Davids T, Gordon KA, Clutton D, Papsin BC. Bone-anchored hearing aids in infants and children younger than 5 years. Arch Otolaryngol Head Neck Surg. 2007;133(1):51-55. 
  34. Clark M, Mierzwinski-Urban M. Bone anchored hearing aid in adults. Health Technology Inquiry Service. Ottawa, ON: Canadian Agency for Drugs and Technologies in Health (CADTH); September 28, 2007.
  35. Wisconsin Department of Health and Family Services. Replacement parts for cochlear implant 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 July 29, 2008.
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