CARC275ReferenceCurrentVerified Aug 15, 2026CARC 275
AR Guide Workflow
Coordination of Benefits
Another plan may be primary, the primary's payment was not applied correctly, or the claim belongs with a different payer under COB rules.
AR Guide explanation
What it means
The prior payer's patient responsibility (deductible, coinsurance, copay) is not covered. Used with group code PR.
AR Guide knowledge
Common denial category
Coordination of Benefits — Another plan may be primary, the primary's payment was not applied correctly, or the claim belongs with a different payer under COB rules.
AR Guide knowledge
Common causes
- Secondary plan does not cover the primary's patient responsibility
AR Guide knowledge
What AR should verify
- Review the secondary plan's COB terms
AR Guide knowledge
Recommended action
- Bill the patient for the remaining patient responsibility per the plan
About this guidance: Note
AR Guide knowledge is general reference content written by our team — it is not payer-specific policy and never replaces the payer’s documentation or your contract. Always confirm specifics with the payer.