20 CFR 416.1400 : Employees' Benefits (§ 1.1 To Parts 1011-1099) — (Part 400 To Part 499) — Social Security Administration (Part 400 To Part 499) — Supplemental Security Income For The Aged, Blind, And Disabled (§ 416.101 To § 416.2227) — Determinations, Administrative Review Process, And Reopening Of Determinations And Decisions (§ 416.1400 To § 416.1499) — Introduction, Definitions, And Initial Determinations (§ 416.1400 To § 416.1406) — Introduction.