CO 194 denial code

Claim adjustment reason code 194. Often reported as CO 194.

Anesthesia by the surgeon or attending

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What 194 means

The anesthesia charge was adjusted because the same physician who did the surgery or attended the patient also gave the anesthesia.

Many payers do not pay a separate anesthesia service when the operating surgeon, assistant surgeon or attending physician provides it. They treat that anesthesia as part of the surgical or attending service.

This usually concerns moderate sedation or local anesthesia billed by the proceduralist, or an anesthesia code submitted under the surgeon's provider number.

Group codes seen with 194

On a remittance, 194 comes after a group code. These are the ones it is most often reported with:

• CO 194 (Contractual Obligation): The provider's side of the ledger. The reduction comes from the payer contract or a rule the provider has to follow, and the patient normally cannot be billed for it.

The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.

Common causes

• An anesthesia service was billed under the same rendering provider as the surgery.
• The rendering NPI on the anesthesia line was entered wrong and matched the surgeon instead of the anesthesia provider.
• Sedation provided by the proceduralist was billed in a way the payer considers included in the procedure.

What to do next

1. Confirm who actually gave the anesthesia using the anesthesia record and operative note.
2. If a separate anesthesia provider did the work, correct the rendering provider and resubmit.
3. Check the payer's policy on sedation by the procedure physician before billing it separately again.
4. Treat the line as included in the surgical payment when the surgeon did provide the anesthesia.

Related codes

• 236 (reason code) Procedure combo conflicts same day
• 234 (reason code) Procedure not paid separately
• 97 (reason code) Service included in another payment