W. Va. Code § 33-15B-2

The provisions of this article apply to all health care providers in the state; all health insurers writing or issuing accident and sickness policies, including hospital service corporations, health service corporations, medical service corporations, dental service corporations and HMOs; all third party payers; all state agencies and departments, including, but not limited to, the public employees insurance agency and providers of services under Medicare and Medicaid; and all entities involved in the payment of health care claims.