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TC Radiology / Pathology / Diagnostic
Last Verified: 2026-09-29

Modifier TC: Technical Component

Modifier TC indicates that only the technical component of a diagnostic procedure (equipment, supplies, technician wages) is being billed.

NCCI Policy: Separates facility overhead from professional interpretation.
Clinical Field: Radiology / Pathology / Diagnostic
Standard: AMA CPT & CMS HCPCS
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Quick Modifier TC Summary

What is Modifier TC? Modifier TC is a medical billing modifier appended to CPT or HCPCS codes to indicate Technical Component. Under official CMS and AMA coding rules, it is applied when modifier TC indicates that only the technical component of a diagnostic procedure (equipment, supplies, technician wages) is being billed.

Official guideline source: CMS Medicare Claims Processing Manual & AMA CPT Guidelines.
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When to Use Modifier TC

Independent testing center performing routine 12-lead ECG tracing without reading (93000-TC).

Clinical Example: Outpatient imaging center providing MRI scanner and technologist time (72148-TC).
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When NOT to Use (Audit Pitfalls)

Do not use by hospital departments billing on UB-04 institutional claims.

Denial Risk: Appending Modifier TC without meeting these criteria triggers post-payment claims recoupment under payer audits.

Official Coding Guidelines & NCCI PTP Unbundling

Billed by independent diagnostic testing facilities (IDTFs) or clinics performing tests without physician interpretation.

National Correct Coding Initiative (NCCI) Policy: Separates facility overhead from professional interpretation. When two procedure codes form a Column 1/Column 2 edit pair with modifier indicator 1, appending Modifier TC signals that the criteria for distinct, separate, or unbundled service delivery have been fully met.

Check Code Pairs for Modifier TC Eligibility
Verify whether your specific CPT code pair allows Modifier TC override under Q4 2026 CMS files.
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Medical Record Documentation Checklist

To defend against Medicare CERT and commercial payer audits, ensure the patient medical record contains:

Core Documentation Directive: Record machine calibration, technician credentials, and test completion timestamp.
  • Independent clinical justification documented contemporaneously with the encounter.
  • Clearly designated procedure timestamps, anatomical laterality (left, right, bilateral), or separate anatomical locations.
  • Physician electronic signature authenticated and dated in the electronic health record (EHR).

Frequently Asked Questions: Modifier TC

Does Modifier TC affect reimbursement payments?

Depending on the code and payer contract, Modifier TC either adjusts the payment percentage or enables secondary codes to be reimbursed without being bundled into the primary procedure.

Can Modifier TC be billed with telehealth services?

Yes, if the clinical encounter satisfies telehealth criteria and the specific conditions for Modifier TC are documented in the virtual medical record.