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Denial Code M56

RARC M56: Missing/invalid payer identifier

This is a Remittance Advice Remark Code (RARC, M-series) — a remark that supplements a CARC on the remittance advice (ERA/EOB) to add detail. Codes appear on the EOB / ERA after a claim is adjudicated.

Reference only — CARC/RARC are national code sets updated periodically. Verify against the current official list before acting on a denial or appeal.

Related RARC codes

M53
Missing/invalid days or units of service
M54
Missing/invalid total charges
M55
We do not pay for self-administered anti-emetic drugs that are not administered with a cov…
M59
Missing/invalid 'to' date(s) of service
M60
Missing Certificate of Medical Necessity
M61
We cannot pay for this as the approval period for the FDA clinical trial has expired

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