CO 203 denial code
Claim adjustment reason code 203. Often reported as CO 203.
Service discontinued or reduced
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 .
What 203 means
The payment was adjusted because the service was stopped partway or reduced compared with the full procedure.
The payer is reducing or denying payment because the service was not done to completion. This often ties to modifiers for discontinued or reduced services, or to documentation showing the procedure was cut short.
Sometimes the code shows up because the modifier was missing and the payer found the reduction in the records, or because the wrong discontinuation modifier was used for the setting.
Group codes seen with 203
On a remittance, 203 comes after a group code. These are the ones it is most often reported with:
- CO 203 (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
- A procedure was stopped after it started because of the patient's condition.
- A reduced or discontinued service modifier was billed and the payer cut the payment.
- Documentation showed less was done than the full code describes.
What to do next
- Read the operative or procedure note to confirm how much of the service was done.
- Check that the right discontinued or reduced service modifier was used for the setting.
- Correct the code or modifier and resubmit if the claim misstated what happened.
- Accept the reduction when it matches the documentation and the payer's policy.
Related codes
- 4 (reason code) Procedure code and modifier do not match
- 45 (reason code) Charge exceeds the allowed amount
- 234 (reason code) Procedure not paid separately
Source
Official wording: X12 Claim Adjustment Reason Codes list. The explanation on this page is our own plain-English wording, not the X12 text.
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