HCPCS Modifier TC
Technical Component
Source: AMA CPT / CMS HCPCS Level II definitions. Maintained by the D3rx Clinical Billing Team.
What modifier TC means
Modifier TC identifies the technical component of a diagnostic test — the equipment, supplies, technician time, and overhead — when the professional interpretation is billed separately by another provider. It is the counterpart to modifier 26.
When to use it
A facility or provider owns the equipment and furnishes the technical resources for a test, while a different physician interprets it — for example, an imaging center billing the technical component of an MRI.
Documentation checklist
The record should support every item below before you append modifier TC.
- That the entity furnished the technical component (equipment/technician/overhead)
- That the code has a professional/technical split (PC/TC indicator 1)
- That the interpretation was billed separately
Do NOT use modifier TC when
- The code is professional-only or has no PC/TC split
- You furnish both components — bill the code globally
- Only the interpretation was furnished — use modifier 26
Common denial reasons
- Appended to a code with no PC/TC split
- Both the global code and the TC component billed
- The technical component was already reimbursed (e.g., packaged under OPPS)
How to appeal a modifier TC denial
Confirm the code carries PC/TC indicator 1 and that the technical component was not already packaged or billed globally. Resubmit with documentation that your entity furnished the equipment/technical resources and that the interpretation was billed separately.
Payer notes
Only PC/TC-indicator-1 codes split into 26 and TC. The technical component is often paid under different rules (for example, facility/OPPS packaging or IDTF policies), so payment behavior differs from the professional component.
Related & commonly confused modifiers
Where modifier TC is used
- Radiology (70450, 72148, 73721)
- Cardiology diagnostics
- Pathology technical services
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Medical billing disclaimer
Modifier definitions follow standard AMA CPT and CMS HCPCS Level II guidance and are for educational reference. Payer policies, billing formats, and coverage rules vary and change. Always verify the current rule with the specific payer before submitting. D3rx is not responsible for claim outcomes.