CO-204 Denial Code: Service Not Covered Under Current Benefit Plan
Unlike a coding or authorization problem, CARC 204 is about the plan design itself. The member's plan excludes the service. It commonly appears with PR when the patient is responsible and with CO when the contract makes the provider responsible.
Also appears as PR-204. The group code changes who is responsible, not the reason.
CARC 204 means the patient's current benefit plan does not cover this service, drug, or equipment. Verify the benefit with the payer, confirm the claim went to the right plan, and follow your financial policy for patient responsibility if the exclusion is valid.
Common causes of CO-204.
- Plan excludes the service, drug, or equipment
- Benefit was removed at plan renewal
- Service billed under a medical benefit when it falls under a separate benefit (for example pharmacy or vision)
- Claim sent to the wrong plan for a member with multiple products
How to work a CO-204 denial.
The order matters: confirm the facts before deciding between a corrected claim, a reconsideration, or an adjustment.
- 1Verify the member's benefit for the specific service with the payer.
- 2Confirm the service was billed under the correct benefit and plan.
- 3If the payer applied the exclusion in error, request reprocessing.
- 4If the exclusion is valid, follow your financial policy and any waiver the patient signed.
How to keep CO-204 from coming back.
- Verify service-specific benefits, not just active eligibility
- Collect financial responsibility waivers for commonly excluded services where permitted
Fixing this at the source usually sits with eligibility verification →
Questions about CO-204.
Denials that often travel with this one.
CO-96: Non-Covered Charge
CO-96 means the payer considers the service a non-covered charge. How to read the RARC, verify benefits, and decide whether to appeal or bill the patient.
Read about CO-96 →CO-27: Expenses Incurred After Coverage Terminated
CO-27 (often PR-27) means coverage was not active on the date of service. How to verify eligibility, find new coverage, and bill correctly before timely filing.
Read about CO-27 →CO-109: Claim Not Covered by This Payer
CO-109 means the claim was sent to the wrong payer or contractor. How to identify the correct payer, including carve-outs and Medicare Advantage, and rebill.
Read about CO-109 →Add a Dedicated Denial Specialist
RCM Staff places trained denial management specialists inside your EHR and clearinghouse to work the queue, correct and appeal claims, and track root causes by payer.
Kevin Jamito has 18+ years of U.S. healthcare revenue cycle management experience across billing, coding, practice management, and offshore RCM operations. He founded RCM Staff to give U.S. healthcare teams dedicated Philippines-based specialists who work inside their existing systems.