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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 42
Chapter IV
Part 421
Subpart E - Subpart E—Medicare Administrative Contractors (MACs)
§ 421.400 - Statutory basis and scope.
§ 421.401 - Definitions.
§ 421.404 - Assignment of providers and suppliers to MACs.
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