Fast answer: Missing Explanation of Benefits for Coordination of Benefits or Medicare Secondary Payer processing.
How to use RARC N479
RARC N479 should be read with the CARC and group code on the same claim or service line. For BCBS denials, the remark often tells you whether the next move is a corrected claim, attachment response, COB update, authorization proof, or appeal packet.
Common paired CARCs
Recommended workflow
- Verify payer order using eligibility, member COB updates, Medicare records, and plan coordination rules.
- Attach the primary payer EOB/ERA or explain why BCBS is primary.
- Submit secondary claim data with correct CAS segments, paid amount, deductible, coinsurance, and adjustment information.
- Ask the member to complete COB updates if the payer requires member response.
- Appeal only after payer order and primary adjudication proof are clean.
Evidence checklist
- Primary payer EOB/ERA
- COB questionnaire status
- Eligibility responses
- Medicare crossover record
- Accident/workers compensation notes
- Secondary claim extract
FAQ
What does RARC N479 mean?
Missing Explanation of Benefits for Coordination of Benefits or Medicare Secondary Payer processing.
Is N479 enough to appeal a BCBS denial?
No. Pair the RARC with the CARC, group code, EOB text, claim line, and plan rule. The RARC explains the missing detail or context; the CARC explains the adjustment reason.
What should I attach for N479?
Start with Primary payer EOB/ERA, COB questionnaire status, Eligibility responses, Medicare crossover record. Add only the records that answer the specific remark code and denial reason.