I bill for a wound care clinic and had submitted some redeterminations to Medicare for large debridements that they say were billed with too many units (eg. 11042, 11045 x30 units for a debridement of 600 sq cm) The response I got back is unfavorable stating that 97597, 97598 are the proper codes for recurrent debridement services. But after doing some research, it seems to me that 97597, 97598 is only for debridement of the epidermis/dermis and 11042, 11045 is for the subcutaneous tissue (which is the depth the dr debrided). Before I go to the next level with appeals I wanted to see if anyone out there had any knowledge to share with me about this. Thanks!