What does CO-236 mean?
CARC code 236 means there is a conflict between the procedure/modifier combination you billed and another claim line that has already been processed. This is a coding and modifier issue. Review the NCCI edits and payer-specific modifier requirements. Ensure you are using the correct modifiers (such as -59, -25, or X modifiers) to properly distinguish the services. Correct the modifier usage and resubmit. Overturn rate is approximately 75%.
How to appeal CO-236
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
Modifier conflict. Review NCCI edits and ensure proper modifier application.
Related denial codes
Procedure code inconsistent with modifier used or required modifier missing
Diagnosis inconsistent with the procedure
Claim lacks information or has submission/billing error(s)
Benefit included in payment for another service
Attachment/documentation required to adjudicate this claim