Any group health policy may on request by the group policyholder provide that all or any portion of any indemnities provided by any such policy on account of hospital, nursing, medical, or surgical services may, at the insurer’s option, be paid directly to the hospital or person rendering such services; but the policy may not require that the service be rendered by a particular hospital or person. See definition sections S.D. Codified Laws §§ 58-18-1 through 58-18-4.