Medicare program: Medicare Advantage and prescription drug programs MIPPA drug formulary & protected classes policies. Interim final rule with comment period.

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.