W. Va. Code § 15A-4-12
The division, or its contracted medical providers, may not pay an amount to an outside provider of a medical service for an adult inmate residing in a jail or correctional facility greater than the reimbursement rate applicable to service providers established in the Medicaid plan by the Bureau for Medical Services: Provided, That critical access hospitals shall be reimbursed at 75 percent of the billed charges. These limitations apply to all medical care services, goods, prescription drugs, and medications provided to a person who is in the custody of a correctional facility and is provided these services outside of a correctional facility: Provided, however, That the Department of Military Affairs and Public Safety and the Department of Human Services effectuate an interagency agreement for the electronic processing and payment of medical services.
W. Va. Code § 15A-4-12