ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.5 > T23.56 > T23.561 T23.561 Corrosion of first degree of back of right hand Non-Billable/Non-Specific Codes T23.561A..., initial encounterT23.561D..., subsequent encounterT23.561S..., sequela