CO-22: Coordination of Benefits
This care may be covered by another payer per coordination of benefits. The payer believes another insurance should be primary.
Why Claims Get Denied with CO-22
Denial code CO-22 is triggered when this care may be covered by another payer per coordination of benefits. the payer believes another insurance should be primary. Understanding the root causes helps prevent future denials and strengthens your appeal when one occurs.
Patient has multiple insurance policies and primary/secondary order is incorrect
Medicare Secondary Payer rules apply (e.g., patient has employer coverage)
Divorce decree or custody agreement affects coverage order for dependents
Auto accident or workers' compensation should be primary
How to Appeal CO-22
Verify the correct primary payer using coordination of benefits rules (birthday rule for dependents, etc.). If your payer is secondary, submit the primary payer's EOB with your claim. If your payer should be primary, provide documentation proving no other coverage exists.
Documentation Required for Appeal
A successful appeal of CO-22 requires thorough documentation. Gather these items before drafting your appeal letter:
Primary payer's Explanation of Benefits (EOB)
Proof of no other coverage (if applicable)
Medicare Secondary Payer questionnaire (if Medicare involved)
Updated insurance card copies
How to Prevent CO-22 Denials
Verify primary and secondary insurance at every visit. Ask about other coverage, auto accidents, and workers' compensation during registration. Update insurance information regularly.
Stop Fighting CO-22 Denials Manually
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