Our surgeon performed a Chiari Decompression (61343) with a pericranial autograft patch from a seperate scalp incision. Based on the coding description for 61343 the graft is included. The physician states since the graft was from a separate incision we should add code 20926 and use modifier 59. Would appreciate additional feedback, do you agree we should code 20926 with a 59 modifier since the graft is from a seperate scalp incision. He only feels code 20926 bundles when the graft is taken from the same incision.