ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.4 > T23.46 > T23.469 T23.469 Corrosion of unspecified degree of back of unspecified hand Non-Billable/Non-Specific Codes T23.469A..., initial encounterT23.469D..., subsequent encounterT23.469S..., sequela