ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.7 > T23.76 > T23.769 T23.769 Corrosion of third degree back of unspecified hand Non-Billable/Non-Specific Codes T23.769A..., initial encounterT23.769D..., subsequent encounterT23.769S..., sequela