CO-109 Denial Code Explained

CO-109 is a medical billing denial code that indicates the claim was submitted to a payer that is not responsible for covering the service. This denial commonly occurs when claims are sent to the wrong insurance company or when coverage information is incorrect.

What Does CO-109 Mean?

The CO-109 denial code means the claim is not covered by this payer or contractor.

This denial is often related to incorrect insurance information, coordination of benefits issues, or billing the wrong payer.

Common Reasons for CO-109

• Claim submitted to the wrong insurance company

• Incorrect primary or secondary payer information

• Coverage terminated before the date of service

• Patient eligibility issues

• Coordination of benefits errors

• Incorrect member or policy information

How To Fix CO-109

Review the patient's insurance information and verify coverage for the date of service. Confirm the correct primary and secondary payer order and update any inaccurate policy information before resubmitting the claim.

If the denial occurred after a service was performed, verify patient eligibility and benefits with the insurance carrier.

Frequently Asked Questions

What does CO-109 mean?

CO-109 means the claim was submitted to a payer that is not responsible for covering the service.

Can CO-109 be appealed?

Generally, no. Most CO-109 denials require correcting the insurance information and submitting the claim to the appropriate payer.

Is CO-109 related to coordination of benefits?

Yes. Incorrect primary and secondary insurance information is a common cause of CO-109 denials.

Can patient eligibility issues cause CO-109?

Yes. Coverage termination or incorrect policy information can trigger this denial.

What should I check first after receiving CO-109?

Verify the patient's insurance coverage, payer sequence, and policy information for the date of service.

Related Denial Codes

You may also encounter:

• CO-16 — Missing or incomplete claim information

• CO-22 — Coordination of benefits issue

• CO-26 — Expenses incurred prior to coverage

• CO-27 — Expenses incurred after coverage terminated

• CO-29 — Timely filing limit exceeded

Quick Summary

CO-109 indicates the claim was submitted to a payer that is not responsible for the service. Most denials are caused by incorrect insurance information, eligibility issues, or coordination of benefits errors.