ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.63 > T23.632 T23.632 Corrosion of second degree of multiple left fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.632A..., initial encounterT23.632D..., subsequent encounterT23.632S..., sequela