The Centers for Medicare & Medicaid Services (CMS) will open the Medicare Part D Claims Data 340B Repository on October 1, 2026, allowing covered entities in the 340B Drug Pricing Program, or their third-party administrators or other contracted partners, to voluntarily submit data from 2026 Medicare Part D 340B claims.
CMS established the repository as part of the Medicare Part D Inflation Rebate Program to test whether submitted claims data could eventually be used to identify 340B units that must be excluded from Part D inflation rebate calculations; data submitted during the testing period will not be used for rebate calculations or other program purposes. Covered entities choosing to participate are requested to submit data quarterly, with claims from January 1 through September 30, 2026, due December 31, 2026. The fact sheet also notes that CMS has proposed, in the CY 2027 Physician Fee Schedule Proposed Rule, to require Medicare providers and suppliers that are 340B covered entities to submit repository data for claims with dates of service on or after January 1, 2027.