Section 523 of the Public Health Service Act, referred to in subsec. (b) and formerly classified to section 290dd–3 of Title 42, The Public Health and Welfare, was renumbered section 544 of that Act by Pub. L. 100–77, title VI, § 611(2), July 22, 1987, 101 Stat. 516 and then omitted in the general revision of Part D of Subchapter III–A of Chapter 6A of Title 42 by Pub. L. 102–321, title I, § 131, July 10, 1992, 106 Stat. 366. Provisions relating to the confidentiality of patient records are now classified to section 290dd–2 of Title 42.