# Medicare Program: Medicare Advantage and Prescription Drug Programs MIPPA Drug Formulary & Protected Classes Policies
> **Centers for Medicare and Medicaid Services** · Interim final rule with comment period. · Published 2009-01-16 · Effective 2009-01-16 · 74 FR 2881
## Document
- **Document number:** E9-783
- **Category:** medicare
- **Sub-agency:** Centers for Medicare and Medicaid Services
- **Federal Register citation:** 74 FR 2881
- **CFR reference:** 42 CFR 423
- **Publication date:** 2009-01-16
- **Effective date:** 2009-01-16
- **HHS docket:** CMS 4138-IFC4
## Abstract

This interim final rule with comment period revises the regulations governing the Medicare prescription drug benefit program (Part D). This regulation makes conforming changes to reflect revisions to the rules governing Part D that were made as a result of provisions in the Medicare Improvements for Patients and Providers Act (MIPPA), which became law on July 15, 2008. These MIPPA provisions change the definition of a covered Part D drug, and add new requirements that apply to Part D formularies.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/01/16/E9-783/medicare-program-medicare-advantage-and-prescription-drug-programs-mippa-drug-formulary-and)
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