Technical component charges must be billed separately (Updated for 2026)

Common Causes for CO-134

Denials with code CO-134 typically happen for the following specific reasons:

• Billing a global service code (without modifiers) for a diagnostic test performed in an inpatient or outpatient hospital setting (Place of Service 21 or 22) where the facility owns the equipment.
• Failure to append modifier 26 to restrict the physician's claim to the professional component of a split-eligible CPT code.
• Inconsistent billing between the rendering physician and the facility, where both parties attempt to claim the global or overlapping components of the same diagnostic test.
• Payer-specific billing rules that restrict freestanding clinics or IDTFs from billing globally for specific cardiology, radiology, or neurology services.

How to Prevent CO-134 Denials

To avoid receiving this denial in the future, implement these specific checks:

• Implement billing system edits that automatically append modifier 26 to diagnostic services when the Place of Service is a facility (POS 21, 22, 23, etc.).
• Review and align contract-specific guidelines regarding global billing versus split-billing for all major commercial and government payers.
• Verify ownership of the diagnostic equipment and the location of the service prior to claim submission to determine if global billing is permitted.
• Conduct regular staff training on CMS Physician Fee Schedule (PFS) relative value file indicators to identify which codes have professional/technical splits.

Appeal Letter Template for CO-134

If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.

[Your Practice Header]
[Date]

[Payer Name]
[Appeals Department Address]

RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: CO-134 - Technical component charges must be billed separately

Dear Appeals Department,

I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-134: "Technical component charges must be billed separately".

We are appealing the denial of this claim under code CO-134. In accordance with CMS Physician Fee Schedule guidelines and AMA CPT coding conventions, the diagnostic service billed is split-eligible. The clinical documentation demonstrates that our provider performed only the professional component (Modifier 26) of the procedure, while the facility maintained the technical infrastructure. We have updated the claim to reflect the appropriate modifier to ensure accurate split-billing compliance. Please reprocess this corrected claim for payment of the professional component as supported by the attached medical records.

Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].

We respectfully request that you reprocess this claim for payment.

Sincerely,

[Your Name]
[Title]
[Practice Name]