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CO-94 Denial Code: Processed in Excess of Charges

CO-94 means the claim was processed in excess of charges: the payer's allowed or paid amount is higher than what you billed. It usually appears as a negative adjustment that balances the remittance, and it can signal that your charges are set below payer rates.

Quick facts

Code
CO-94 (CARC 94)
Status
Active In use since January 1, 1995.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): The payer reports the amount above the billed charge as a contractual adjustment, typically a negative value that increases payment rather than reducing it.
  • OA (Other Adjustment): Some payers use the other adjustment group when the excess reflects a pricing method, such as a per diem or case rate, rather than a contract term.
Official description
Processed in Excess of charges.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-94 means

CARC 94 means the claim or service was processed in excess of charges. The payer’s calculated payment is higher than the charge you submitted, and it reports the difference with CARC 94 so the remittance balances. Because the adjustment adds money rather than subtracting it, it usually appears as a negative amount on the ERA (835).

It is uncommon, and it is not a denial. It shows up most often when the payer’s pricing is not tied to your billed charge: inpatient DRG payments, per diem rates, case rates, bundled episode payments, or contracts that pay a fixed rate regardless of charge.

Example: a facility bills a short stay at a charge below the payer’s case rate. The payer pays the full case rate and reports the extra amount as CO-94.

Common causes

  • DRG, per diem, or case rate pricing that exceeds the billed charge for a low-charge stay.
  • Professional charges set below the payer’s fee schedule for some services, where the payer does not apply lesser-of-charge logic.
  • A charge entered in error (for example, a missing digit), making it far lower than intended.
  • Outlier or add-on payments calculated separately from charges.
  • Payer pricing errors, such as the wrong rate table applied to the claim.

How to fix it

  1. Verify the charge on the claim in box 24F (or the institutional total charges). If a keying error understated it, decide with the payer whether a corrected claim is appropriate, using resubmission code 7 in box 22.
  2. Check the payment against your contract. If it matches the contracted rate or pricing method, post the CO-94 as a positive adjustment and close the claim.
  3. If the payment looks wrong, contact the payer. Keeping money you believe was paid in error can create an overpayment liability. Follow the payer’s voluntary refund process where required.
  4. Review patient balances. If the patient paid cost-sharing based on the charge, confirm their responsibility is still correct and issue a refund if they overpaid.

How to prevent problems with CO-94

  • Review your chargemaster or fee schedule against payer allowed amounts at least once a year. Frequent CO-94 on fee schedule claims suggests some charges are set too low.
  • Validate charges at entry so a mistyped amount does not reach the payer. A pre-submission Claims Validator can flag charges that fall far outside normal ranges.
  • Map CARC 94 in your system as a payment increase so it does not distort write-off reports.
  • Keep contract rate sheets current so you can tell a correct excess payment from an error.
  • CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): The opposite situation: the charge exceeds the allowed amount and is reduced.
  • CO-131 (Claim specific negotiated discount.): Claim-specific negotiated discount, another pricing adjustment.
  • CO-A0 (Patient refund amount.): Patient refund amount, relevant if a patient overpaid.
  • OA-23 (The impact of prior payer(s) adjudication including payments and/or adjustments. (Use only with Group Code OA)): Prior payer impact, which can make secondary processing look unusual.

CO-94 FAQ

Why would a payer pay more than I billed?

Some pricing methods, such as per diem, case rate, DRG, or certain fee schedules, set payment independently of the billed charge. If your charge is lower than that rate, the payment can exceed it.

Do I have to refund a CO-94 amount?

Not automatically. If the payment follows the payer's pricing method and your contract, it may be correct. If it resulted from an error, follow the payer's overpayment and refund process.

Does CO-94 mean my fees are too low?

Possibly. If you see it often on professional claims paid from a fee schedule, your charges may be set below what payers allow, and some payers pay the lesser of charge or allowed amount.