The purpose of this policy is to provide criteria for medical necessity determinations for genetic testing when no other clinical policy or decision-support criteria are available. The policy clarifies when genetic testing is appropriate to confirm or rule out suspected genetic conditions, predict disease risk, identify carrier status, and establish prenatal or clinical diagnoses or prognoses. It also guides review of genetic panels to determine whether each included gene analysis is medically necessary.
Genetic tests described include three principal methods: gene tests (DNA/RNA sequencing or probe-based assays to detect small or large alterations, copy number changes, or gene activity), chromosomal tests (karyotype and FISH to detect chromosome number and structural changes), and biochemical tests (measuring protein/enzyme amounts or activity, commonly used in newborn screening).
Intended use cases enumerated in the policy include: diagnosis of suspected inherited disorders, prediction of disease risk, carrier detection, prenatal diagnosis, and informing clinical prognosis and management. The policy emphasizes that testing should be used when results will lead to a clinically useful change in care (for example, prevention, earlier detection, management of disease progression, treatment of symptoms, or pregnancy decision‑making).
Special considerations for testing children are specified: testing should account for availability of evidence‑based risk‑reduction strategies and the likelihood of developing a serious condition during childhood. Unless a clinical intervention is appropriate in childhood, parents are encouraged to defer testing for adult‑onset conditions until the child reaches adulthood, with advocacy for the child’s best interests until they can decide for themselves.