S.D. Codified Laws § 58-17-61
Any person insured by a health insurance company, health maintenance organization, preferred provider organization, individual practice association, or nonprofit hospital service corporation may assign in writing benefits from such policy, contract, or certificate to a hospital licensed pursuant to chapter 34-12. If such assignment is executed and written notice thereof is given, the insurance company, health maintenance organization, preferred provider organization, individual practice association, or nonprofit hospital service corporation shall pay the benefits directly to the hospital.
Nothing in this section modifies the scope of coverage or the amount of benefits payable under a health insurance policy, contract, or certificate.
SDCL 58-17-61