T23.46 - Corrosion of unspecified degree of back of hand T23.4 - Corrosion of unspecified degree of wrist and hand T23.46 - Corrosion of unspecified degree of back of hand T23.461 - Corrosion of unspecified degree of back of right hand T23.462 - Corrosion of unspecified degree of back of left hand T23.469 - Corrosion of unspecified degree of back of unspecified hand