CO-204: Service/Equipment/Drug Not Covered Under Benefit Plan
The service is not covered under the plan. Appeal with plan language and clinical documentation if you believe it should be covered.
What Does CO-204 Mean?
With CO (Contractual Obligation), the non-covered service is denied contractually. Appeal if you believe the service is covered under the plan language or meets medical necessity criteria. If genuinely non-covered, the provider cannot bill the patient under most contracts unless the patient signed an Advance Beneficiary Notice (ABN) or similar waiver.
CARC 204 indicates that the billed service, drug, or equipment is explicitly excluded from the patient's benefit plan. Unlike denials for medical necessity (where the service type is covered but the specific use was not justified), this code means the entire category of service or specific item is not part of the plan's covered benefits.
This denial commonly occurs when a medication is not on the plan's formulary, DME is excluded from the benefit package, the plan has a benefit cap that has been reached, or the service requires prior authorization that was not obtained. Understanding the specific reason for non-coverage is essential for determining the correct resolution path.
Common Causes
| Cause | Frequency |
|---|---|
| Service excluded from the patient's benefit plan The specific service, equipment, or drug is explicitly excluded from the patient's current insurance plan benefits | Most Common |
| Plan does not cover the specific drug or equipment The medication or durable medical equipment prescribed is not on the plan's formulary or covered equipment list | Most Common |
| Service not medically necessary per payer policy The payer determined the service does not meet their medical necessity criteria under the patient's current benefit plan | Common |
| Prior authorization not obtained The service required prior authorization that was not obtained before the service was delivered | Common |
| Maximum benefit reached The patient has exhausted their plan's benefit limit for this type of service, equipment, or drug | Common |
| Out-of-network provider for non-covered service The service was provided by an out-of-network provider and the plan does not provide out-of-network benefits for this service type | Occasional |
How to Resolve
- Review plan coverage Confirm the service is excluded from the patient's benefit plan.
- Appeal if coverage should apply Submit plan benefit language, clinical documentation, and NCD/LCD citations supporting coverage.
- Request formulary exception For drugs, submit a medical necessity-based formulary exception request.
- Explore alternatives If non-covered, discuss alternative covered options with the physician.
Appeal if you believe the service is covered under the patient's benefit plan or meets medical necessity criteria. Include clinical documentation, physician orders, relevant plan benefit language, and any applicable NCD/LCD citations. Demonstrate why the specific service, drug, or equipment was required for the patient's condition.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-204:
| RARC | Description |
|---|---|
| N130 | Consult plan benefit documents/guidelines for coverage of this service. Review the patient's plan documents to understand coverage exclusions and limitations → |
| N386 | This decision was based on a National Coverage Determination (NCD) or Local Coverage Determination (LCD). Review the applicable NCD or LCD for coverage criteria → |
| N381 | Alert: Consult your contractual agreement for restrictions, billing, and payment information. Review your payer contract for details on non-covered service billing → |
How to Prevent CO-204
- Verify insurance coverage for specific services, drugs, and equipment before delivery
- Obtain required prior authorizations proactively before providing services
- Maintain thorough clinical documentation supporting medical necessity
- Educate patients about their plan's coverage limitations before scheduling services
- Stay current with payer policy updates and formulary changes
- Verify formulary status for prescribed medications before dispensing
Also Filed As
The same CARC 204 may appear with different Group Codes:
Related Denial Codes
Sources
- https://x12.org/codes/claim-adjustment-reason-codes
- https://www.mdclarity.com/denial-code/204
- https://portal.ct.gov/-/media/ohs/health-it-advisory-council/apcd-advisory-group/data-submission-guide-workgroup/meeting-materials/6-30-22/carc-codes_final.pdf
- Codes maintained by X12. Visit x12.org for official definitions.