CARC 266 Active

OA-266: Adjustment for Compound Preparation Cost (Pharmaceuticals Only)

TL;DR

The payer adjusted the compound preparation cost on a pharmaceutical claim. Verify the compound is covered, properly documented with medical necessity, and correctly coded, then resubmit or appeal with formulation details.

Action
Review & Decide
Who Pays
Depends
Appeal
No
Patient Impact
Indirect
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does OA-266 Mean?

CARC 266 is a pharmaceutical-specific adjustment that addresses the compounding preparation cost for customized medications. Compounding involves combining, mixing, or altering ingredients to create a medication tailored to a patient's specific needs. The preparation cost covers the labor, equipment, and expertise required for the compounding process.

The adjustment may occur because the plan does not cover compound preparation costs, the cost exceeds plan limits, the payer questions whether compounding was necessary (when a commercially available alternative exists), required prior authorization was not obtained, coding was incorrect, or medical necessity documentation was insufficient.

Compound medication billing has been subject to increased scrutiny by payers. Demonstrating medical necessity — why a compounded medication was required rather than a commercially available alternative — is often the key to successful reimbursement.

How to Resolve

Verify the compound preparation is covered and documented, confirm coding accuracy, and appeal with formulation details and medical necessity documentation.

  1. Review the claim documentation Confirm the compound preparation is properly documented with formulation details and ingredients.
  2. Verify coding accuracy Ensure appropriate HCPCS or CPT codes are used for the compound pharmaceutical.
  3. Evaluate medical necessity documentation Confirm that records demonstrate why the compound medication was required versus a commercially available alternative.
  4. Contact the payer for clarification Clarify the specific reason for the adjustment with the payer.
  5. File an appeal if warranted Appeal with compound formulation details, medical necessity documentation, prescriber's rationale, and contract provisions supporting the charge.
  6. Track outcomes Monitor the appeal and track all communications.
Do Not Appeal This Code

Adjustment for Compound Preparation Cost (Pharmaceuticals Only) grouped under OA is an Other Adjustment that doesn't fall into the standard contractual write-off or patient responsibility categories. Whether action is needed depends on the specific reason — review any accompanying RARC codes and payer guidance to decide whether this is a final adjustment to accept or an issue to resolve through resubmission.

Also Filed As

The same CARC 266 may appear with different Group Codes:

CO-266 PR-266

Related Denial Codes

OA-74 — Indirect Medical Education Adjustment OA-75 — Direct Medical Education Adjustment OA-76 — Disproportionate Share Adjustment OA-85 — Patient Interest Adjustment OA-89 — Professional Fees Removed from Charges

Sources

  1. https://www.mdclarity.com/denial-code/266
  2. https://resdac.org/sites/datadocumentation.resdac.org/files/Adjustment%20Reason%20Code%20Code%20Table%20(TAF%20Claims).txt
  3. https://x12.org/codes/claim-adjustment-reason-codes
  4. Codes maintained by X12. Visit x12.org for official definitions.