facilities, $500,000,000 which shall be in addition to funds previously appropriated under this heading that become available on October 1, 2018: and, in addition, $14,419,786,000, plus reimbursements, shall become available on October 1, 2019, and shall remain available until September 30, 2020: Provided , That, of the amount made available on October 1, 2019, under this heading, $2,000,000,000 shall remain available until September 30, 2021. Medical support and compliance For necessary expenses in the administration of the medical, hospital, nursing home, domiciliary, construction, supply, and research activities, as authorized by law