CFR›Title 42›Chapter IV›Part 428›Subpart B ContainsSections 428.100–428.101CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart B—Determination of Part D Rebatable Drugs Sections 428.100 § 428.100 Definitions. 428.101 § 428.101 Identification of Part D rebatable drugs. Previous A Subpart A—General Provisions Next C Subpart C—Determination of the Rebate Amount for Part D Rebatable Drugs