CO-22 Denial Code Explained

CO-22 is a medical billing denial code that indicates payment has been adjusted because another payer may be responsible for the claim. This denial commonly occurs when coordination of benefits information is incomplete, incorrect, or missing.

What Does CO-22 Mean?

The CO-22 denial code means the insurance payer believes another insurance carrier may have primary responsibility for the claim.

This denial is often related to coordination of benefits issues, multiple insurance plans, or incorrect payer sequencing.

Common Reasons for CO-22

• Incorrect primary insurance information

• Secondary insurance billed before primary insurance

• Coordination of benefits errors

• Multiple active insurance policies

• Outdated patient coverage information

• Medicare Secondary Payer (MSP) issues

How To Fix CO-22

Verify the patient's insurance coverage and determine which payer is primary. Update any incorrect coordination of benefits information and submit the claim to the appropriate insurance carrier.

If the patient has multiple insurance plans, ensure the correct payer order is followed before resubmitting the claim.

Frequently Asked Questions

What does CO-22 mean?

CO-22 means another insurance payer may be responsible for the claim before the current payer can issue payment.

Is CO-22 a coordination of benefits denial?

Yes. CO-22 is one of the most common denial codes related to coordination of benefits and payer sequencing issues.

Can CO-22 be appealed?

Most CO-22 denials are resolved by correcting insurance information rather than filing an appeal.

What should I check first after receiving CO-22?

Verify the patient's active insurance coverage and determine the correct primary and secondary payer order.

Can Medicare claims receive a CO-22 denial?

Yes. Medicare Secondary Payer rules can result in CO-22 denials when another insurance carrier should be billed first.

Related Denial Codes

You may also encounter:

• CO-20 — Another payer is primary

• CO-21 — Charges covered under a capitation agreement

• CO-23 — Charges paid by another payer

• CO-109 — Claim not covered by this payer

Quick Summary

CO-22 indicates another insurance payer may be responsible for the claim. Most denials are caused by coordination of benefits issues, incorrect payer sequencing, or outdated insurance information.