Patient is not covered under this benefit (Updated for 2026)

Common Causes for CO-80

Denials with code CO-80 typically happen for the following specific reasons:

• The service billed is an explicit exclusion under the patient's contract, such as cosmetic, experimental, or routine wellness services.
• The service requires a specific benefit rider that the patient's employer group or individual plan did not elect to purchase.
• The services are managed by a third-party carve-out administrator, such as mental health or physical therapy, and were billed to the primary medical payer in error.
• The service was performed outside of the active coverage dates, either before the policy's effective date or after its termination.

How to Prevent CO-80 Denials

To avoid receiving this denial in the future, implement these specific checks:

• Perform comprehensive eligibility and benefit verification prior to scheduling elective or highly specialized services.
• Utilize pre-determination of benefits processes for services frequently categorized as plan exclusions.
• Secure signed financial responsibility waivers, such as an Advance Beneficiary Notice or commercial equivalent, when non-coverage is anticipated.
• Configure practice management software to alert billing staff of plan-specific exclusions during the registration and scheduling phase.

Appeal Letter Template for CO-80

If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.

[Your Practice Header]
[Date]

[Payer Name]
[Appeals Department Address]

RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: CO-80 - Patient is not covered under this benefit

Dear Appeals Department,

I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-80: "Patient is not covered under this benefit".

We are writing to appeal the denial of code [Procedure Code] for the date of service [Date of Service] based on denial code CO-80. While this service was categorized as a non-covered benefit, clinical documentation demonstrates that the procedure was performed as a vital, medically necessary treatment for the patient's acute clinical condition, distinguishing it from standard elective or cosmetic exclusions. In accordance with standard medical billing guidelines and AMA CPT definitions, this service represents the standard of care for the documented diagnosis. We request a clinical peer review of the attached medical records and ask that an exception be made to cover this service as a necessary medical benefit.

Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].

We respectfully request that you reprocess this claim for payment.

Sincerely,

[Your Name]
[Title]
[Practice Name]