taking into account the adoption of such exceptions. (3) Agreements The Secretary of Veterans Affairs and the Secretary of Health and Human Services may enter into agreements to carry out this subsection. Any such agreement shall provide that any expenses incurred by the Secretary of Health and Human Services pertaining to carrying out this subsection shall be reimbursed by the Secretary of Veterans Affairs. (4) Group health plan defined In this subsection, the term group health plan means a group health plan (as that term is defined in section 5000(b)(1) of the Internal Revenue Code of 1986 without regard to section 5000(d) of the Internal Revenue Code of 1986). 2606. Receipt of health care through the Department (a) Contracts Any health insurance provider that provides a health plan for which health insurance support may be provided under this subchapter or subchapter II may enter into a contract with the Veterans Accountable Care Organization under which the medical personnel and facilities of the Veterans Accountable Care Organization may be treated as a designated provider for purposes of such health plan. (b) Cost of care The cost, including any copayments, of any health care or treatment provided to a veteran by the Veterans Accountable Care Organization under a contact under subsection (a) shall be determined by the Veterans Accountable Care Organization. (c) Mechanism The Board of Directors of the Veterans Accountable Care Organization shall establish a mechanism through which the Veterans Accountable Care Organization enters into contracts with health insurance providers under subsection (a). 2607. Pharmacy benefits A veteran who is enrolled in the VetsCare Choice program or the VetsCare Senior program may fill prescriptions at pharmacies of the Department. II Medicare-Eligible Veterans 2611. VetsCare Senior program: designation of recipients (a) In general The authorities for the provision of health insurance support under this subchapter may be referred to as the VetsCare Senior program . (b)