RARC N479 Active Supplemental

RARC N479: Missing EOB for COB or MSP Claim

What This Means

The Explanation of Benefits (EOB) required for Coordination of Benefits (COB) or Medicare Secondary Payer (MSP) processing is missing from the claim. When billing a secondary payer, the primary payer's EOB must be attached to show payment or denial details. Obtain the primary payer's EOB, attach it to the claim, and resubmit to the secondary payer.

Disclaimer
This content is for informational purposes only. Always verify against your payer contracts and current coding guidelines.

Commonly Paired With

RARC N479 commonly appears alongside these CARC denial codes:

Code Name
CO-19 Workers' Compensation Claim →
CO-20 Liability Carrier Responsible →
CO-21 No-Fault Carrier Responsible →
CO-106 Patient Payment Option Not in Effect →
CO-112 Service Not Furnished Directly or Not Documented →
CO-116 Advance Indemnification Notice Requirements Not Met →
CO-159 Service Provided as Result of Terrorism →
CO-163 Attachment/Documentation Not Received →
CO-164 Attachment/Documentation Not Received Timely →
CO-215 Third Party Subrogation Settlement →
CO-219 Extent of Injury Adjustment (also OA-219) →
CO-223 Mandated Federal/State/Local Law Adjustment (also OA-223, PR-223) →
CO-224 Patient Identity Compromised (also OA-224) →
CO-226 Provider Information Not Provided or Incomplete →
PR-227 Patient/Insured Information Not Provided →
CO-228 Information Not Provided to Previous Payer (also PR-228, OA-228) →
CO-250 Incorrect Attachment Received — Expected Document Still Missing →
CO-252 Attachment Required to Adjudicate Claim →
CO-P13 Workers' Compensation Jurisdictional Regulation Adjustment →
CO-P15 Workers' Compensation Medical Treatment Guideline Adjustment →
CO-P16 Provider Not Authorized to Treat Injured Workers →
CO-P2 Non-Work Related Injury/Illness →
CO-P4 Workers' Compensation Claim Non-Compensable →
CO-P6 Benefits Entitlement Adjustment →

Sources

  1. X12.org