MA27: Missing/incomplete/invalid entitlement number or name shown on the claim
The Medicare Beneficiary Identifier (or old HICN) or the patient's name on the claim does not match what Medicare has on file, so the claim could not be matched to a beneficiary record.
Corrective actions
- 1
Verify the MBI against the patient's Medicare card
Confirm the exact Medicare Beneficiary Identifier and legal name as printed on the current Medicare card, since even a single-character mismatch causes this rejection.
- 2
Resubmit with corrected identifiers
Update the patient demographic fields with the verified MBI and name and resubmit as a corrected claim.
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Retrieved 2026-07-18.
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DenialPath provides billing and administrative guidance based on published CMS and X12 sources. It is not medical advice, not a coverage determination, and not a guarantee of payment. NCCI and MUE edits are republished quarterly and payer policies vary by contract. Always confirm against the payer's own current policy before submitting or appealing.