T23.31 - Burn of third degree of thumb (nail) T23.3 - Burn of third degree of wrist and hand T23.31 - Burn of third degree of thumb (nail) T23.311 - Burn of third degree of right thumb (nail) T23.312 - Burn of third degree of left thumb (nail) T23.319 - Burn of third degree of unspecified thumb (nail)