(a) The Secretary may contract for the delivery of health care to which covered beneficiaries are entitled under chapter 55 of title 10. The Secretary may enter into a contract under this section with any of the following:
(b) A contract entered into under this section may provide for the delivery of—
total health care services for all covered beneficiaries who reside in a geographic area designated by the Secretary.
The Secretary may prescribe a premium, deductible, copayment, or other change for health care provided under this section.