Technical component (-TC)

When a diagnostic service is split between two entities—one providing the physical infrastructure and staff to run the test, another providing the clinical interpretation—each entity bills only its share. The Technical Component captures the 'doing' side: the imaging equipment, radiological supplies, contrast agents, the technician's time, and all associated practice and malpractice expense tied to running the procedure. Reimbursement flows to whoever owns or pays for those resources, typically a hospital outpatient department, independent imaging center, or a physician-owned practice that employs the technical staff.

To claim only the TC, append modifier TC in the first modifier field of the same CPT or HCPCS code that the interpreting physician will use with modifier 26. This split billing is appropriate only for codes carrying a PC/TC Indicator of '1' in the CMS Medicare Physician Fee Schedule Database (MPFSDB). Codes flagged with indicator '2' (professional component only), '3' (technical component only), or '4' (global test only) are not eligible for this split; appending TC to them is a billing error that triggers automated RAC review.

In orthopedics, TC billing appears most often with plain radiographs, fluoroscopic imaging, bone-density (DEXA) scans, nerve-conduction studies, and intraoperative imaging when the surgeon's practice owns the equipment but refers interpretation to a radiologist or neurologist. Understanding the split is critical for practices that lease imaging time or purchase technical services from a hospital under a professional services agreement, since the TC and professional component must be billed on separate claim lines rather than combined on a single global claim.

Misusing the TC modifier—or failing to use it when required—creates direct financial and compliance consequences. If a physician bills the global code when only the technical work was performed in their facility, the practice is overclaiming the professional RVUs and risks repayment demands through automated RAC auditing (RAC Topic 0116). Conversely, omitting TC when a facility should bill it results in lost revenue that cannot easily be recouped after timely-filing deadlines pass. CMS specifies that TC procedures are institutional and cannot be billed separately by a physician when the patient is an inpatient, in a covered Part A SNF stay, or receiving hospital outpatient services—errors in those settings can generate both overpayment and Medicare compliance exposure.