CFR›Title 42›Chapter IV›Part 407 ContainsSubparts A–DCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 407—SUPPLEMENTARY MEDICAL INSURANCE (SMI) ENROLLMENT AND ENTITLEMENT Subparts A Subpart A—General Provisions Sections 407.1–407.4 B Subpart B—Individual Enrollment and Entitlement for SMI Sections 407.10–407.32 C Subpart C—State Buy-In Agreements Sections 407.40–407.50 D Subpart D—Part B Immunosuppressive Drug Benefit Sections 407.55–407.62 Authority42 U.S.C. 1302, 1395p, 1395q, and 1395hh.Source53 FR 47204, Nov. 22, 1988, unless otherwise noted. Previous 406 Part 406—Hospital Insurance Eligibility and Entitlement Next 408 Part 408—Premiums for Supplementary Medical Insurance