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CO-96 Denial Code — Non-Covered Charge — What It Means and How to Appeal
CO-96 means the charge is non-covered — but the CO group code means the provider owes this write-off, not you. If you're being billed for a CO-96 amount, that's the problem to fix.
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CO-96 Is Often a Billing Error — Not Your Bill
The CO group code means the write-off sits with the provider. Appeal only if the exclusion itself is wrong.
CO-96 Denial Code Description — What It Means in Medical Billing
The CO-96 denial code description is: "Non-covered charge(s)."
CO-96 and PR-96 carry the same description but mean very different things financially. The group code — CO vs. PR — determines who is responsible for the non-covered amount:
- CO-96 (Contractual Obligation): The provider absorbs the non-covered write-off. You owe nothing. The provider's network contract prohibits billing you for CO-group adjustments.
- PR-96 (Patient Responsibility): The insurer is designating the non-covered amount as your financial responsibility.
If you received a CO-96 on your remittance advice but are being asked to pay the amount, the provider is billing you for a contractual write-off — which is a contract violation.
CO-96 Denial Reason — Why This Denial Happens and How to Overturn It
The service is genuinely excluded from the plan
The plan's Summary Plan Description or Evidence of Coverage lists the specific service as a non-covered benefit. If the exclusion language clearly and unambiguously covers your service, this is a legitimate CO-96. The provider absorbs the write-off and you owe nothing.
The exclusion language is ambiguous
Insurance exclusions must be explicit and unambiguous to be enforceable. If the plan document's exclusion language could reasonably be read as covering your service, it may be overturnable on appeal under the legal doctrine of contra proferentem — ambiguous policy language must be interpreted in your favor.
The service falls within ACA essential health benefits
ACA-compliant plans must cover ten categories of essential health benefits without annual or lifetime dollar limits. If your CO-96 denial is for a service within an EHB category — preventive care, maternity, mental health, prescription drugs, rehabilitative services — the exclusion may violate the ACA. File both an internal appeal and a state insurance commissioner complaint.
CO-96 Denial Code Solution — Step-by-Step Resolution
If you're being billed — dispute immediately
Send a written dispute to the provider citing the CO group code. CO-96 is a contractual write-off — billing patients for CO-coded amounts violates most network contracts. Request the remittance advice showing the CO-96 code.
If the coverage denial is the issue — review the exclusion
Obtain your Summary Plan Description and locate the specific exclusion cited. If it's ambiguous, unclear, or doesn't explicitly cover your service, file a written appeal.
Cite ACA essential health benefits if applicable
If your service falls within an EHB category, cite the ACA and file a complaint with your state insurance commissioner simultaneously with your internal appeal.
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