ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.62 > T23.622 T23.622 Corrosion of second degree of single left finger (nail) except thumb Non-Billable/Non-Specific Codes T23.622A..., initial encounterT23.622D..., subsequent encounterT23.622S..., sequela