340B Duplicate Discount and Claim Identifiers
What a 340B claim must carry and whether 340B stock may be used, by payer.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Payer
- Medicare Part B
- Date of service
- 2026-05-01
Result: Put the TB modifier on each separately payable Part B drug line for units acquired under 340B; it replaced JG for every covered entity on January 1, 2025 (CMS MLN4800856).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Payer
- Medicaid Exclusion File status (Medicaid fee-for-service)
- Date a carve-in or carve-out change was approved (YYYY-MM-DD)
- The state's 340B identifier rule for Medicaid managed care
- Date of service (YYYY-MM-DD)
How this is calculated
Citation
CMS MLN4800856: the TB modifier on Part B 340B drug lines from January 1, 2025; CMS Part D 340B repository fact sheet (August 2026); HRSA: the Medicaid Exclusion File applies to fee-for-service only, with a snapshot at 12:01 am ET on the 16th of the month before a quarter. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.