CFR›Title 20›Chapter III›Part 404›Subpart A ContainsSections 404.1–404.3CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart A—Introduction, General Provisions and Definitions Sections 404.1 § 404.1 Introduction. 404.2 § 404.2 General definitions and use of terms. 404.3 § 404.3 General provisions. AuthoritySecs. 203, 205(a), 216(j), and 702(a)(5) of the Social Security Act (42 U.S.C. 403, 405(a), 416(j), and 902(a)(5)) and 48 U.S.C. 1801. Next B Subpart B—Insured Status and Quarters of Coverage