CO-199: Revenue code and Procedure code do not match.
On an institutional facility claim, the revenue code billed is not a valid or expected pairing with the CPT or HCPCS procedure code on the same line.
What the group code means
- CO
- Contractual Obligation. The provider is responsible and the amount cannot be billed to the patient.
Why it fires
- The revenue code used does not correspond to the category of service the procedure code represents
- The charge master mapping between revenue codes and CPT/HCPCS codes is outdated or misconfigured
- A data entry error paired the wrong revenue code with the correct procedure code, or vice versa
Corrective actions, ranked
- 1
Check the charge master mapping
Verify the correct revenue code to procedure code pairing per your charge description master and payer requirements.
- 2
Correct the mismatched field
Fix whichever code, revenue or procedure, is actually wrong and resubmit as a corrected claim.
- 3
Audit the charge master
If this recurs across many claims, have HIM or coding staff review and update the charge master mapping tables.
Is it worth appealing
Not an appeal. Correct the revenue or procedure code pairing and resubmit rather than appealing.
Other denial codes to check
Codes that share a remark code with this one, or that are reported under the same group code.
- CO-45Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.
- CO-97The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated.
- CO-16Claim/service lacks information or has submission/billing error(s).
- CO-11The diagnosis is inconsistent with the procedure.
- OA-18Exact duplicate claim/service (Use only with Group Code OA except where state workers' compensation regulations requires CO)
- CO-29The time limit for filing has expired.
Retrieved 2026-07-18.
Do not let this happen again
Scrub the claim against NCCI PTP and MUE edits before you submit, free and in your browser.
Denial7 provides billing and administrative guidance based on published CMS and X12 sources. It is not medical advice, not a coverage determination, and not a guarantee of payment. NCCI and MUE edits are republished quarterly and payer policies vary by contract. Always confirm against the payer's own current policy before submitting or appealing.