CO-260: Medicaid ACA Enhanced Fee Schedule Adjustment

What Does CO-260 Mean?

CO-260 indicates a contractual fee schedule adjustment under the Medicaid ACA Enhanced Fee Schedule. The difference between your billed amount and the ACA-enhanced allowed amount is a contractual write-off that cannot be billed to the patient. This is the standard group code for this adjustment because Medicaid participating providers agree to accept the Medicaid fee schedule as payment in full.

When CARC 260 appears on a remittance, the Medicaid payer is telling you that the claim was adjudicated using the ACA Enhanced Fee Schedule rather than (or in addition to) the standard Medicaid fee schedule. This code was introduced in 2014 to support the Affordable Care Act's provision requiring states to increase Medicaid reimbursement for certain primary care services to Medicare-equivalent rates. The adjustment amount reflects the difference between what was billed and what the ACA-enhanced schedule allows.

In most cases, CARC 260 appears with Group Code CO, indicating a contractual write-off that the provider must absorb. This is not a denial in the traditional sense — the claim was processed and paid, but at a rate determined by the Medicaid ACA fee schedule. If the enhanced rate is lower than your billed amount, the difference is a contractual adjustment. If you expected the standard Medicaid rate and instead received the ACA-enhanced rate (which may be higher or lower depending on the service), the code serves as an informational flag.

Practices that treat a high volume of Medicaid patients should pay close attention to this code, especially during periods when states are transitioning into or out of ACA-enhanced rate programs. Fee schedule changes at the state level can retroactively affect reimbursement, and monitoring CARC 260 patterns can help you identify revenue cycle disruptions early. If you believe the wrong fee schedule was applied — for example, a service that should have been paid at the enhanced rate but was not — you have grounds to request reprocessing from the payer.

Common Causes

How to Resolve

Confirm the correct Medicaid fee schedule was applied, verify your provider enrollment supports ACA-enhanced rates, and either accept the contractual adjustment or request reprocessing.

1. Compare the allowed amount to the ACA Enhanced Fee Schedule Cross-reference the payment against the current ACA-enhanced rates for the billed service code. If the allowed amount matches the published rate, the adjustment is correct.
2. Verify provider enrollment for enhanced rate eligibility Check that your enrollment status with the Medicaid program qualifies you for ACA-enhanced reimbursement. Update enrollment if necessary to prevent future underpayments.
3. Post the contractual adjustment or request reprocessing If the rate is correct, write off the CO-260 amount as a contractual allowance. If the rate appears incorrect, submit a reprocessing request with supporting documentation from the state Medicaid fee schedule.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-260:

How to Prevent CO-260

• Maintain an up-to-date copy of your state's Medicaid ACA Enhanced Fee Schedule and compare it against your charge master regularly
• Verify provider enrollment and specialty designations that qualify for enhanced Medicaid rates before submitting claims
• Use automated claim scrubbing tools that validate billed amounts against the applicable Medicaid fee schedule before submission
• Monitor state Medicaid bulletins for fee schedule updates or changes to ACA-enhanced rate programs

General Prevention

• Verify patient Medicaid eligibility and the applicable fee schedule before rendering services using real-time eligibility verification tools
• Stay current with Medicaid ACA Enhanced Fee Schedule updates by regularly reviewing Medicaid provider bulletins and policy notices
• Ensure provider enrollment and credentialing records are up to date so claims qualify for enhanced Medicaid rates
• Use accurate CPT/HCPCS codes and required modifiers that align with ACA enhanced fee schedule eligible services
• Monitor denial trends for CARC 260 to identify systematic issues with fee schedule application across your Medicaid claims
• Implement automated claim scrubbing to catch coding errors before submission to Medicaid payers

Also Filed As

The same CARC 260 may appear with different Group Codes:

Related Denial Codes