What does CO-11 mean?
CARC code 11 indicates the ICD-10 diagnosis code you submitted does not support the CPT procedure code billed. In behavioral health, this commonly happens when a general diagnosis code is used instead of a specific one, or when the diagnosis does not establish medical necessity for the service provided. Review the LCD/NCD coverage policies for your CPT code to find the accepted diagnosis codes. Update the diagnosis to the most specific ICD-10 code that accurately reflects the patient's condition. Resubmit with the corrected linkage. Success rate is approximately 80%.
How to appeal CO-11
Check the RARC code
The RARC (Remittance Advice Remark Code) on your ERA provides specific details about why the claim was denied. This tells you exactly what needs to be fixed.
Correct the identified issue
Fix the specific billing or coding error identified. Verify the correction against payer guidelines before resubmitting.
Resubmit the corrected claim
Resubmit with the appropriate frequency code (7 for replacement, 8 for void/resubmit) along with the corrected information.
Key notes for behavioral health
ICD-10 does not support the CPT billed. Review medical necessity linkage. May need more specific diagnosis.
Related denial codes
Procedure code inconsistent with modifier used or required modifier missing
Claim lacks information or has submission/billing error(s)
Benefit included in payment for another service
Procedure/modifier combination not compatible with another already adjudicated
Attachment/documentation required to adjudicate this claim