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5.2.5.4 Technical Components
For technical components of laboratory, radiology, or radiation therapy procedures, use modifier TC. Using this modifier results in TOS T being assigned to the procedure.
Exception: Outpatient hospitals do not include the TC modifier when they provide technical components of lab and radiology services. These services automatically have TOS 4 or 5 assigned and are subject to the facility's interim reimbursement rate or the clinical lab fee schedule.
Additionally, the following procedure codes do not require a modifier for TOS assignment and are processed automatically as a technical component with a TOS T:
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