T23.61 - Corrosion of second degree of thumb (nail) T23.6 - Corrosion of second degree of wrist and hand T23.61 - Corrosion of second degree of thumb (nail) T23.611 - Corrosion of second degree of right thumb (nail) T23.612 - Corrosion of second degree of left thumb (nail) T23.619 - Corrosion of second degree of unspecified thumb (nail)