N479N-series (general use)COB & Secondary
N479: Missing EOB for COB or MSP
Coordination-of-benefits or Medicare-Secondary-Payer processing requires an explanation of benefits that wasn't provided.
Commonly appears with these denial codes
The denial code gives the category; N479 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Obtain the controlling payer's EOB and rebill with complete COB/MSP information. For MSP, confirm the correct payer order first — MSP questionnaires prevent repeats.
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