I need some help coding the removal and replacement of a multi component penile prosthesis. The surgeon removed and replaced the pump and cylinders but not the reservoir. I though I would append modifier 52 since he did not remove and replace all components (pump, cylinders, and reservoir) however the surgeon is stating that because he removed and replaced the 2 main parts of the prosthesis, the cylinders and pump, that it wouldn't require modifier 52. I cannot find any rules on this. Do you only append modifier 52 when just one component is removed and replaced?