CO-53: Services by Immediate Relative Not Covered

What Does CO-53 Mean?

With CO (Contractual Obligation), the CARC 53 adjustment for services by immediate relative not covered is a contractual reduction. The provider absorbs this amount per the payer contract or regulatory payment methodology. The patient is not responsible for the adjusted amount. Review the remittance to confirm the adjustment is consistent with your contract terms.

CARC 53 indicates services by immediate relative not covered. The payer determined that the service or a portion of it does not meet coverage criteria under the patient's current plan benefits or the applicable coverage rules.

Common scenarios that trigger this adjustment include: the rendering provider is an immediate family member (spouse, parent, child, sibling) of the patient; The provider and patient reside in the same household; Medicare and most payers exclude services rendered by immediate relatives. The group code paired with CARC 53 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, OA indicates a coordination of benefits or other payer adjustment, PR shifts it to the patient.

Common Causes

How to Resolve

1. Review the adjustment against contract terms Compare the CO-53 adjustment with your payer contract to confirm the reduction is consistent with agreed terms or regulatory methodology.
2. Verify the adjustment amount Confirm the dollar amount of the adjustment is calculated correctly based on the contracted rate and the service provided.
3. Appeal if the adjustment is incorrect If the provider is not related to the patient, appeal with documentation proving no family relationship. Include provider and patient identification showing different last names, addresses, or an attestation of non-relationship.
4. Process the contractual adjustment If the adjustment is correct per contract terms, process it accordingly in your billing system. This amount cannot be transferred to the patient.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-53:

How to Prevent CO-53

• Ensure services are not rendered by family members for billing purposes
• Check provider-patient relationship before scheduling and billing
• Assign a non-related provider for family members' care
• Train billing staff on family member exclusion rules

Also Filed As

The same CARC 53 may appear with different Group Codes:

Related Denial Codes