Many insurance companies require a letter of medical necessity from a doctor as part of the precertification process before they will cover genetic testing. This letter should be written to justify testing and often explain how genetic testing will help doctors make a patient treatment plan and improve patient health. Medical geneticists are most familiar with writing these letters, but if your primary care or a doctor from another specialty is ordering your genetic testing, they may appreciate an example letter to review as they write their letter. Many support groups, genetic laboratories, and genetic testing companies provide test specific letter examples for doctors. For example, DuchenneConnect has a Example Letters of Medical Necessity webpage and Ambry Genetics Forms webpage.
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