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U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 06, 2025

All TitlesTitle 42Chapter IVPart 423Subpart K - Subpart K—Application Procedures and Contracts with Part D plan sponsors
§ 423.500 - Scope.
§ 423.501 - Definitions
§ 423.502 - Application requirements.
§ 423.503 - Evaluation and determination procedures.
§ 423.504 - General provisions.
§ 423.505 - Contract provisions.
§ 423.506 - Effective date and term of contract.
§ 423.507 - Nonrenewal of contract.
§ 423.508 - Modification or termination of contract by mutual consent.
§ 423.509 - Termination of contract by CMS.
§ 423.510 - Termination of contract by the Part D sponsor.
§ 423.512 - Minimum enrollment requirements.
§ 423.514 - Validation of Part D reporting requirements.
§ 423.516 - Prohibition of midyear implementation of significant new regulatory requirements.
§ 423.520 - Prompt payment by Part D sponsors.
§ 423.521 - Final settlement process and payment.
§ 423.522 - Requesting an appeal of the final settlement amount.
§ 423.530 - Plan crosswalks.
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