42 U.S.C. § 4593
Payments
Payments under this chapter may be made in advance or by way of reimbursement and in such installments as the Secretary may determine.
( Pub. L. 91–616, title VI, § 603 , formerly title V, § 503, Dec. 31, 1970 , 84 Stat. 1855 , renumbered Pub. L. 94–371, § 7 , July 26, 1976 , 90 Stat. 1038 .)