MEDICAL NECESSITY is a term common to health care coverage and insurance policies in the United States. A common definition of medical necessity as used by insurers is:
[H]ealth care services that a Physician, exercising prudent clinical judgment, would provide to a patient for the purpose of preventing, evaluating, diagnosing or treating an illness, injury, disease or its symptoms, and that are: (a) in accordance with generally accepted standards of medical practice; (b) clinically appropriate, in terms of type, frequency, extent, site and duration, and considered effective for the patients illness, injury, or disease; and (c) not primarily for the convenience of the patient, physician, or other health care provider, and not more costly than an alternative service or sequence of services at least as likely to produce equivalent therapeutic or diagnostic results as to the diagnosis or treatment of that patients illness, injury or disease.
Generally accepted standards of medical practice means standards that are based on credible scientific evidence published in peer-reviewed medical literature generally recognized by the relevant medical community, Physician Specialty Society recommendations and the views of Physicians practicing in relevant clinical areas and any other relevant factors.4
The current Board of Directors of the WPATH herewith expresses its considered opinion based on clinical and peer reviewed evidence that gender affirming/confirming treatments and surgical procedures, properly indicated and performed as provided by the Standards of Care, have proven to be beneficial and effective in the treatment of individuals with transsexualism or gender dysphoria. Gender affirming/confirming surgery, also known as sex reassignment surgery, plays an undisputed role in contributing toward favorable outcomes. Treatment includes legal name and sex or gender change on identity