This CPB is revised to state that neuropsychological and psychological testing are considered medically necessary for selected indications when all of the following criteria are met: 1) the number of hours or units requested for testing does not exceed the reasonable time necessary to address the clinical questions with the identified measures; 2) the testing techniques are validated for the proposed diagnostic or treatment plan; 3) the testing techniques do not represent redundant measurements of the same cognitive, behavioral or emotional domain; 4) the testing techniques are both validated for the age and population of the member, and they are the most updated version of the instrument; and 5) the instruments selected have the empirically substantiated reliability, validity, standardized administration and clinically relevant normative data to assess the diagnostic question or treatment planning goals.