CO-35 Denial Code Explained

CO-35 is a medical billing denial code that indicates the claim was denied because benefits are not available under the patient’s current insurance plan. This denial commonly occurs when coverage limitations or policy exclusions apply.

What Does CO-35 Mean?

The CO-35 denial code means the insurance payer determined the billed service is not eligible for reimbursement under the patient’s policy benefits.

This denial is often related to benefit exclusions, eligibility limitations, or non-covered treatments.

Common Reasons for CO-35

• Non-covered services

• Benefit exclusions

• Policy limitations

• Incorrect payer billing

• Out-of-network restrictions

• Eligibility verification issues

How To Fix CO-35

Review the patient’s insurance benefits and confirm the service is covered under the active policy. Verify payer guidelines, eligibility information, and coverage limitations before resubmitting the claim.

Providers may need to discuss financial responsibility with the patient if coverage is unavailable.

Related Denial Codes

You may also encounter:

• PR-204 — Non-covered service denial

• CO-32 — Patient not eligible for service benefits

• CO-96 — Non-covered service denial

• CO-109 — Coverage limitation denial

Quick Summary

CO-35 indicates the billed service is not covered under the patient’s insurance benefits. Most denials are related to eligibility or policy limitation issues.

Medical billing denial codes, insurance prefixes, and claim guidance in one searchable resource hub.

© 2026. All rights reserved.

Quick Links

Denial Codes

BCBS Prefixes

Articles

Resources

About ClariMed

Terms and Conditions

Privacy Policy