I have a question regarding codes 11720 and 11721. Do we code based on how many nails are debrided or how many nails are mycotic? My doctor is coding a 11720 because the patient has 4 mycotic toenails even though his documentation states he debrided ten dystrophic toenails. I have read the medicare guidelines and I see that Medicare will only cover services if the nails are mycotic and that it must be documented. The way I see it the doctor worked on all ten so shouldn’t we code a 11721. I am a little confused and would really appreciate any information. Thank you