U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 42Chapter IVPart 421 - PART 421—MEDICARE CONTRACTING
Subpart A [§ 421.1 - § 421.5] - Subpart A—Scope, Definitions, and General Provisions
Subpart B [§ 421.100 - § 421.128] - Subpart B—Intermediaries
Subpart C [§ 421.200 - § 421.214] - Subpart C—Carriers
Subpart D [§ 421.300 - § 421.316] - Subpart D—Medicare Integrity Program Contractors
Subpart E [§ 421.400 - § 421.404] - Subpart E—Medicare Administrative Contractors (MACs)
Subpart F - Subpart F [Reserved]
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