Final answer:
The first unit of practice expense for Diagnostic imaging procedures is reimbursed at 100%.
Step-by-step explanation:
The correct answer is C) Diagnostic imaging. In the Current Procedural Terminology (CPT) coding system, the practice expense component is one of the three components used to determine the reimbursement amount for a service or procedure. Diagnostic imaging procedures, such as X-rays, CT scans, and MRI scans, have the first unit of their practice expense reimbursed at 100% of its value.