ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.5 > T23.56 > T23.569 T23.569 Corrosion of first degree of back of unspecified hand Non-Billable/Non-Specific Codes T23.569A..., initial encounterT23.569D..., subsequent encounterT23.569S..., sequela