Question: What ASA code would you use for removal of sternal wires from a coronary artery bypass graft (CABG)? Texas Subscriber Answer: The procedure, 20680 (Removal of implant;deep [e.g., buried wire, pin, screw, metal band, nail, rod or plate]), crosswalks to 00470 (Anesthesia for partial rib resection; not otherwise specified), according to the Relative Value Guide.