CFR›Title 21›Chapter I›Part 4 ContainsSubparts A–BCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 4—REGULATION OF COMBINATION PRODUCTS Subparts A Subpart A—Current Good Manufacturing Practice Requirements for Combination Products Sections 4.1–4.4 B Subpart B—Postmarketing Safety Reporting for Combination Products Sections 4.100–4.105 Authority21 U.S.C. 321, 331, 351, 352, 353, 355, 360, 360b-360f, 360h-360j, 360l, 360hh-360ss, 360aaa-360bbb, 360ddd, 360ddd-1, 371(a), 372-374, 379e, 381, 383, 394; 42 U.S.C. 216, 262, 263a, 264, 271.Source78 FR 4321, Jan. 22, 2013, unless otherwise noted. Previous 3 Part 3—Product Jurisdiction Next 5 Part 5—Organization