CO-266: Adjustment for Compound Preparation Cost (Pharmaceuticals Only)
CO-266 is a contractual adjustment to compound preparation charges. Verify medical necessity documentation and appeal with formulation details if the charge is legitimate.
What Does CO-266 Mean?
When paired with Group Code CO, the compound preparation cost adjustment is contractual. The provider absorbs the adjustment and cannot transfer it to the patient.
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.
Common Causes
| Cause | Frequency |
|---|---|
| Compound preparation costs not covered under plan The payer's plan does not cover or reimburse compound preparation costs for customized medications created by combining different ingredients | Most Common |
| Incorrect coding for compound pharmaceutical charges Improper code assignment to pharmaceutical compound costs resulted in the adjustment or denial | Common |
| Insufficient documentation for medical necessity of compound Insufficient evidence demonstrating the compound medication is medically required versus a commercially available alternative | Common |
| Compound cost exceeds insurance plan maximum allowance The compound preparation cost surpasses the insurance plan's maximum allowable amount for compounding fees | Occasional |
| Missing prior authorization for compound medications The insurance plan requires pre-approval for compound medications and the authorization was not obtained before dispensing | Occasional |
How to Resolve
- Review documentation for accuracy Confirm the compound preparation documentation is complete with formulation details.
- Verify coding Ensure appropriate compound pharmaceutical codes are used.
- Evaluate medical necessity Confirm documentation shows why compounding was required over a commercially available alternative.
- Appeal if warranted File an appeal with the compound formulation, medical necessity documentation, and prescriber's rationale.
If compound preparation costs should be covered, file an appeal with the compound formulation details, medical necessity documentation, prescriber's rationale for compounding, and contract provisions supporting the charge.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-266:
| RARC | Description |
|---|---|
| N381 | Alert: Consult your contractual agreement for restrictions, billing, and payment information. Review compound preparation cost provisions in the payer contract to verify the correct allowed amount → |
How to Prevent CO-266
- Maintain accurate documentation of compound pharmaceutical preparations with complete formulation details
- Verify medical necessity documentation is sufficient before submitting claims for compound medications
- Review current coding guidelines for compound pharmaceuticals to ensure proper code selection
- Conduct regular audits of compound pharmaceutical billing to identify errors before submission
- Train staff on compound medication billing requirements and payer-specific policies
Also Filed As
The same CARC 266 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/266
- https://resdac.org/sites/datadocumentation.resdac.org/files/Adjustment%20Reason%20Code%20Code%20Table%20(TAF%20Claims).txt
- https://x12.org/codes/claim-adjustment-reason-codes
- Codes maintained by X12. Visit x12.org for official definitions.