A 25-year-old obese male has had right-sided flank pain for about two months and noticed a lump during work one day. He initially thought it was a muscle spasm and ignored it, but it has increased in size and has gotten more painful. He went through a CT scan, which showed an intramuscular mass consistent to the physical exam that is approximately 6 cm in diameter. Due to the size and presentation, it was decided to excise the tumor. What is the correct code to use for this procedure?