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CMS details its 340B claims repository. Prepare before it’s required

CMS has published the rules of the road for a 340B Part D claims repository that opens Oct. 1, and because the agency has proposed tying mandatory reporting to Medicare enrollment in 2027, the voluntary period is a chance to fix data problems early.

3 min read
CMS details its 340B claims repository. Prepare before it's required

Executive takeaway

Treat the voluntary 340B repository as a dress rehearsal. If the 2027 mandate is finalized, incomplete data could put Medicare enrollment at risk, so assign ownership and test files now.

Article

What CMS released

This week, CMS posted a fact sheet and FAQs on the repository. Starting Oct. 1, 340B covered entities can submit data on drugs dispensed under 340B and paid by Part D plans, for dates of service on or after Jan. 1, 2026. Claims count whether the drug was dispensed in-house or at a contract pharmacy.

Each record carries a short list of fields: the entity’s 340B ID, a claim record indicator, date of service, prescription or service reference number, fill number, NDC-11 and the dispensing pharmacy’s NPI. Files can be uploaded as spreadsheets or CSV. CMS asks for submissions at least quarterly, within one quarter after the quarter closes. Claims from January through September 2026 are due Dec. 31.

Third-party administrators can submit on an entity’s behalf, but the covered entity remains responsible for accuracy. Accounts must be set up by a CEO, CFO or someone with delegated authority.

Why it matters

For now, CMS says it will use the data only to test whether it could identify 340B units to exclude from Part D inflation rebate calculations. It will not share the data with manufacturers or Part D plans, and the repository does not change what hospitals are paid for 340B drugs.

The bigger issue is what comes next. In its proposed 2027 physician fee schedule rule, CMS would require Medicare-enrolled covered entities to submit data for claims on or after Jan. 1, 2027. If finalized, participation would become a condition of Medicare enrollment, and CMS could revoke enrollment for failure to comply. That turns a pharmacy data task into an enterprise compliance risk.

What to do before Oct. 1

  • Name an executive owner. Decide who will create the account and certify data, and document any delegation to a third-party administrator.
  • Test the data. Ask your 340B team and contract pharmacy administrators whether they can produce every required field, especially the pharmacy NPI and fill number, for 2026 claims.
  • Use the voluntary window. Submitting early surfaces mapping and matching errors while the stakes are low.
  • Check vendor contracts. Confirm that administrators must deliver repository-ready files on time and correct errors.
  • Brief the board. Make sure audit and compliance committees know that 340B reporting may soon affect Medicare enrollment.

Archive entry for Aug 27, 2026, added Nov. 11, 2026.

Sources

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