((a)) ** In general** The States of North Dakota and South Dakota shall be designated as a contract health service delivery area by the Service for the purpose of providing contract health care services to members of Indian tribes in the States of North Dakota and South Dakota.

((b)) ** Maintenance of services** The Service shall not curtail any health care services provided to Indians residing on any reservation, or in any county that has a common boundary with any reservation, in the State of North Dakota or South Dakota if the curtailment is due to the provision of contract services in those States pursuant to the designation of the States as a contract health service delivery area by subsection (a).