US lawFederal (United States)RegulationsTitle 42 CFR — Public HealthChapter IV — CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICESPart 417 — HEALTH MAINTENANCE ORGANIZATIONS, COMPETITIVE MEDICAL PLANS, AND HEALTH CARE PREPAYMENT PLANSSubpart K — Enrollment, Entitlement, and Disenrollment under Medicare Contract417.43442 C.F.R. § 417.434Reenrollment.Last amended: 2017Year: 2026Length: 41 wordsOfficial source Cite as 42 C.F.R. § 417.434 (2026)If an HMO or CMP requires periodic reenrollment, it must reenroll Medicare enrollees unless there is a basis for disenrollment as set forth in § 417.460. [50 FR 1346, Jan. 10, 1985, as amended at 58 FR 38082, July 15, 1993]Cross-references to the CFR417.460.Previous42 C.F.R. § 417.432Next42 C.F.R. § 417.436