Require health plan and Medicaid coverage of biomarker testing

HB 8 requires health insurance plans and Ohio Medicaid to cover biomarker testing for diagnosis, treatment, and ongoing disease monitoring when ordered by a provider as medically necessary. The bill mandates coverage only for tests supported by specific evidence, such as FDA-approved uses, clinical guidelines, or peer-reviewed studies showing improved health outcomes, and explicitly excludes screening purposes. It also requires plans to minimize disruptions in care (like multiple biopsies) and ensures an accessible appeal process for coverage denials. This affects patients with conditions requiring these tests and healthcare providers ordering them, but does not change existing coverage for screening.