W. Va. Code § 33-16-10: Policies discriminating among health care providers.

Notwithstanding any other provisions of law, when any health insurance policy, health care services plan or other contract provides for the payment of medical expenses, benefits or procedures, such policy, plan or contract shall be construed to include payment to all health care providers including medical physicians, osteopathic physicians, podiatric physicians, chiropractic physicians, midwives and nurse practitioners who provide medical services, benefits or procedures which are within the scope of each respective provider's license. Any limitation or condition placed upon services, diagnoses or treatment by, or payment to any particular type of licensed provider shall apply equally to all types of licensed providers without unfair discrimination as to the usual and customary treatment procedures of any of the aforesaid providers.