CFR › Title 42 › Part 417 › §417.43442 CFR §417.434Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkIf 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.