This subchapter was in the original title IV of Pub. L. 94–437, as amended. Prior to amendment by Pub. L. 102–573, title IV enacted section 1622 of this title and sections 1395qq and 1396j of Title 42, The Public Health and Welfare, amended sections 1395f, 1395n, and 1396d of Title 42, and enacted provisions set out as notes under section 1671 of this title and sections 1395qq and 1396j of Title 42.