I'm hoping somebody can help us. We're a general surgery office and it's common for us to remove suspicious masses (lipomas, cysts, etc) and typically more than one. We frequently run into using the same code because although it's the same code we may have 5 masses to remove. We follow the Mutually Exclusive List but Medicare (and really all insurance) is giving us a hard time trying to use our modifiers XU and XS. We even tried to just bill them as units. Has anybody had this happen to them? Does anybody know of any rules that differentiate when and what to use? I appreciate any help anybody can offer!