CFR›Title 21›Chapter I›Part 821›21 CFR Part 821 Subpart A Citation21 CFR Part 821 Subpart AContainsSections § 821.1–§ 821.4CorpusDaily eCFRDisplayed edition2026-09-17Last updated2026-09-17 Subpart A—General Provisions Sections § 821.1 § 821.1 Scope. § 821.2 § 821.2 Exemptions and variances. § 821.3 § 821.3 Definitions. § 821.4 § 821.4 Imported devices. Authority21 U.S.C. 331, 351, 352, 360, 360e, 360h, 360i, 371, 374.Source58 FR 43447, Aug. 16, 1993, unless otherwise noted.