I need some clarification with the coding of DeNovo NT cartilage allograft. Per Zimmer, it was suggested to use unlisted code
27599 for the knee. My supervisor, however, is asking why code
27415 osteochondral allograft, be used. I'm not really confident on how to answer her, only that 27415 is for subchondral bone, and DeNovo is for cartilage.