T23.41 - Corrosion of unspecified degree of thumb (nail) T23.4 - Corrosion of unspecified degree of wrist and hand T23.41 - Corrosion of unspecified degree of thumb (nail) T23.411 - Corrosion of unspecified degree of right thumb (nail) T23.412 - Corrosion of unspecified degree of left thumb (nail) T23.419 - Corrosion of unspecified degree of unspecified thumb (nail)