CPT codes 76942,77002,77003,77012, and 77021 describe radiological guidance for needle placement by different modalities. CMS payment policy allows one unit of service for any of these codes at a single patient encounter regardless of the number of needle placements performed. The unit of service for these codes is the patient encounter, not the number of lesions, number of aspirations, number of biopsies, number of injetions or number of localizations.
NCCI Policy Manual ...Chapter 9...Radiology Services....