Quick Explanation
This denial occurs when the payer's adjudication system calculates a patient liability amount—such as a deductible, copayment, or coinsurance—that is greater than the total submitted charge for the service. Under healthcare billing standards, a patient cannot be held financially responsible for an amount that exceeds the actual billed charges of the provider.
Common Causes for CO-97
Denials with code CO-97 typically happen for the following specific reasons:
- Payer adjudication system errors where a flat copayment is automatically applied to a low-cost service, exceeding the actual billed charge.
- Incorrect Coordination of Benefits (COB) processing where the secondary payer's cost-share calculation fails to account for the primary payer's payment, artificially inflating patient liability.
- Improperly loaded payer contract fee schedules that do not place a cap on patient responsibility relative to the allowed or billed amount.
- Duplicate or split billing of single services that results in multiple copayments being misapplied to fractional charges.
How to Prevent CO-97 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Pre-verify payer-specific contract terms regarding flat-rate copayments for low-cost procedures to ensure automated billing systems flag potential overages.
- Audit secondary claims prior to submission to confirm that prior payments and patient liabilities are accurately mapped in the COB loops.
- Perform regular billing system updates to validate that line-item charges are set appropriately above standard contract copayments.
- Monitor electronic remittance advices (ERAs) for recurring CO-97 codes to identify and report systemic payer system adjudication bugs.
Appeal Letter Template for CO-97
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-97 - Patient liability may not exceed charges
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-97: "Patient liability may not exceed charges".
We are appealing the adjudication of this claim as the patient liability has been incorrectly calculated to exceed the total charges, violating CMS billing standards and basic healthcare accounting guidelines. Pursuant to industry regulations, a patient's cost-sharing responsibility (copayment, coinsurance, or deductible) must never exceed the contracted allowed amount or the actual billed charge for the rendered service. The current remittance indicates a patient liability that surpasses the submitted charge of the line item, representing an administrative processing error. We request a manual review and immediate re-adjudication of this claim to correctly align the patient's financial responsibility with our contract terms and the actual billed charges.
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]
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