Does the path have to come back as a tumor to use "Excision,tumor" codes? I've seen other coders suggest using the musculoskeletal excision codes for cysts, etc. but I thought the diag had to match the description of the code. For example, a pt had a low axillary mass located in subcutaneous tissue that came back as "benign breast tissue with nodular pseudoangiomatous stromal hyperplasia". The mass was located in the subcu so I'm wondering if I should use 11403 or 21555. Any suggestions?