((a)) ** .—** If, in the course of furnishing hospital care, a medical service, or an extended care service authorized by the Secretary and pursuant to a contract, agreement, or other arrangement with the Secretary, a provider who is not a party to the contract, agreement, or other arrangement furnishes hospital care, a medical service, or an extended care service that the Secretary considers necessary, the Secretary may compensate the provider for the cost of such care or service.

((b)) ** .—** The Secretary shall take reasonable efforts to enter into a contract, agreement, or other arrangement with a provider described in subsection (a) to ensure that future care and services authorized by the Secretary and furnished by the provider are subject to such a contract, agreement, or other arrangement.