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 O — Medicare Payment: Cost Basis417.54242 C.F.R. § 417.542Reinsurance costs.Last amended: 2017Year: 2026Length: 5 wordsOfficial source Cite as 42 C.F.R. § 417.542 (2026)Reinsurance costs are not allowable.Previous42 C.F.R. § 417.540Next42 C.F.R. § 417.544