CO 94 denial code

Claim adjustment reason code 94. Often reported as CO 94 or OA 94.

Processed above the billed charges

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 94 means

The payer allowed or paid more than the amount billed on the claim and reported the difference with this code.

Sometimes a payer's fee schedule or case rate is higher than what the provider billed, and the payer pays the higher amount. This code explains the gap between charges and payment.

It is generally good news, but it can also signal that your charge for the service is set below what payers allow, or that the payer priced the wrong service.

Group codes seen with 94

On a remittance, 94 comes after a group code. These are the ones it is most often reported with:

• CO 94 (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.
• OA 94 (Other Adjustment): Used for adjustments that are neither the provider's contractual write-off nor the patient's share. It often appears with coordination of benefits, for example when another payer already paid.

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

• The provider's charge for the service is below the payer's fee schedule amount.
• An inpatient case rate or DRG payment exceeded the total charges for a short stay.
• The payer priced the claim under a different service or rate than the one billed.

What to do next

1. Confirm the payment matches the contract so you are not holding an overpayment.
2. Review your charge master if several payers allow more than you bill for the same service.
3. Contact the payer if the payment looks tied to the wrong service or patient.

Related codes

• 45 (reason code) Charge exceeds the allowed amount