CO-265 Denial Code (CARC 265) 2026: Pharmacy Administrative Cost Adjustment

The CO-265 denial code means a plan reduced or refused an administrative cost a pharmacy billed on a drug claim. The drug itself often pays in full. Only the extra administrative amount is written down. The fix is to check whether your contract pays an administrative fee, then write off or appeal the line. (Primary source: X12 Claim Adjustment Reason Codes)

In brief: reason code 265 reads “Adjustment for administrative cost. Usage: To be used for pharmaceuticals only.” Most plans pay pharmacy overhead through the dispensing fee. A separate admin charge is often cut. With group CO, the patient cannot be billed for it.

Part of our denial codes library. Written by Manikandan J, CPC, CRCR, who has worked pharmacy remits for long-term care and specialty pharmacy billing teams. Published 3 November 2026. Last updated: 3 November 2026. Code wording quoted word for word from X12. Read about the author and our editorial policy, or contact us to report an error.

What does denial code CO-265 mean?

Denial code CO-265 means the plan adjusted an administrative cost on a pharmacy claim. The pharmacy sent the cost as an other amount with qualifier 04. The plan paid less than billed, or nothing. CO tells you the pharmacy must write off the difference under its contract.

Source: X12 Claim Adjustment Reason Codes, checked 3 November 2026. On the NCPDP D.0 claim, administrative cost is qualifier 04 in field 479-H8, with the amount in 480-H9 (Nebraska Medicaid D.0 payer sheet).

Methodology: the code wording is copied from the X12 list, and the fee rules come from the eCFR and payer sheet pages cited below.

Key terms: A CARC is a Claim Adjustment Reason Code that explains a payment change. The dispensing fee is the set amount a plan pays for filling a prescription. CO means contractual obligation, so the pharmacy owns the balance.

CO-265 vs OA-265: how are they different?

CO-265 says the admin cost cut comes from your contract with the plan. OA-265 says the cost was adjusted, but not under a contract term or patient share. For example, a secondary plan may use OA-265 after the primary already set the allowed amount. Neither version moves the cost to the patient.

In my experience, CO-265 spikes right after a billing profile change adds a default admin fee to every claim.

Why do plans cut pharmacy administrative costs?

Plans cut pharmacy administrative costs because the dispensing fee is meant to cover pharmacy overhead. The Part D rule in 42 CFR 423.100 includes work such as checking the computer for coverage information in dispensing fee costs (eCFR, 42 CFR 423.100). It also includes the pharmacy’s overhead.

Commercial and Medicaid plans can be different. Some pay a set admin fee for programs such as long-term care packaging. Most do not accept qualifier 04 at all.

How do I fix a CO-265 adjustment?

To fix a CO-265 adjustment, find out why the admin amount was on the claim. Then check the plan’s payer sheet and contract for an admin fee term. If there is none, write it off and stop billing it. If the contract pays it, appeal with the contract page.

1. Find qualifier 04. Confirm the CO-265 amount matches the 480-H9 value sent with qualifier 04.
2. Compare the payer sheet. See whether the plan accepts other amounts at all.
3. Check the contract. Look for a program fee, such as a long-term care or compounding allowance.
4. Post or appeal. Write it off as contractual, or appeal with the contract term.
5. Fix the source. Remove any default admin fee from plans that do not pay it.

Claim form note

No claim form visual is shown here. CARC 265 is for pharmaceuticals only. The admin cost is claimed on the NCPDP pharmacy claim, so there is no CMS-1500 box or UB-04 form locator to fix.

Does the patient owe a CO-265 amount?

No, the patient does not owe a CO-265 amount. CO means the contract places the cost on the pharmacy. Billing the patient for it would break most network agreements. Post it as a write-off and review only the patient pay amount the plan returned on the claim.

Related codes

FAQ

Sources

How we checked: the CARC 265 quote was matched word for word with the X12 CARC list on 3 November 2026, and the dispensing fee text with the eCFR.

• X12, Claim Adjustment Reason Codes (CARC 265). Accessed 3 Nov 2026.
• eCFR, 42 CFR 423.100 (dispensing fees definition). Accessed 3 Nov 2026.
• Nebraska Medicaid, NCPDP D.0 payer specification. Accessed 3 Nov 2026.
• X12, Claim Adjustment Group Codes. Accessed 3 Nov 2026.

Last updated: 3 November 2026 · Educational content; not legal advice.