I'm going back and forth between different codes; mainly 21601 and 19120. I'm going to summarize the OP report: "Recurrence in chest wall after undergoing mastectomies for breast cancer. Mass palpated in upper outer quadrant of right mastectomy flap. Incision full-thickness down to muscle and capsule was undertaken. Mass resected and had not penetrated through the capsule margin........ Turned over for plastics closure and implant exchange." Does anyone have any experience of this field of coding? It's still fairly new to me so I am still learning. This was performed by a breast surgeon. Any feedback would be greatly appreciated.