CO-25: Code Edit: Procedure Code Mismatch
CO (Contractual Obligation)What is CO-25?
CO-25 is a Contractual Obligation code indicating a code edit found the procedure code does not match expected patterns. This is similar to CO-4 but specifically addresses code edits rather than NCCI bundling. The payer's editing system flagged an inconsistency in the code combination.
Why Does CO-25 Occur?
- Procedure code and modifier combination fails the payer's code edit logic.
- Add-on code billed without the required primary procedure code.
- Code pair flagged by the payer's proprietary editing system (beyond NCCI).
- Mutually exclusive codes billed on the same date of service.
How to Fix CO-25 Denials
- Identify which code pair or combination triggered the edit by reviewing the RARC code.
- If an add-on code was billed without the primary, add the primary procedure code.
- If the edit is a payer-specific rule (not NCCI), check the payer's code editing manual.
- Appeal if the code combination is clinically appropriate and the payer's edit is incorrect.
CO-25 by Payer
| Payer | Common RARC | Appeal Deadline | Notes |
|---|---|---|---|
| UnitedHealthcare | Varies | 60 days from remittance | Reconsideration required before formal appeal. |
| Anthem | Varies | 365 days from denial notice | Check state-specific provider manual for variations. |
| Aetna | Varies | 180 days from denial | Strict in-network filing enforcement. |
| Cigna | Varies | 180 days from denial | Cigna COB team: 1-800-244-6224. |
| Medicare | Varies | 120 days (redetermination at MAC) | Five levels of appeal starting with MAC redetermination. |
Related CARC Codes
If you are seeing CO-25, check these related codes: CO-4 (incompatible coding), CO-97 (bundled service), CO-16 (claim differs).
Common Questions About CO-25
What does CO-25 mean?
CO-25 indicates code edit: procedure code mismatch. Check the RARC code on the EOB for the specific reason and follow the resolution steps above.
Can I appeal a CO-25 denial?
Yes. Commercial payers allow 60-365 days to appeal depending on the payer. Gather supporting documentation before filing. Medicare allows 120 days for a redetermination request.
Altair catches CO-25 denials before submission with code edit checking. See how pre-submit claim scoring works.