Question: How would you code an ultrasound guided thoracentesis? New Hampshire Subscriber Answer: Per CPT, you would report 76942 (Ultrasonic guidance for needle placement [e.g., biopsy, aspiration, injection, localization device], imaging supervision and interpretation) with either 32421 (Thoracentesis, puncture of pleural cavity for aspiration, initial or subsequent) or 32422 (Thoracentesis with insertion of tube, includes water seal [e.g., for pneumothorax], when performed [separate procedure]). Tip: