ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.5 > T23.53 > T23.532 T23.532 Corrosion of first degree of multiple left fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.532A..., initial encounterT23.532D..., subsequent encounterT23.532S..., sequela