T23.56 - Corrosion of first degree of back of hand T23.5 - Corrosion of first degree of wrist and hand T23.56 - Corrosion of first degree of back of hand T23.561 - Corrosion of first degree of back of right hand T23.562 - Corrosion of first degree of back of left hand T23.569 - Corrosion of first degree of back of unspecified hand