ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.62 > T23.629 T23.629 Corrosion of second degree of unspecified single finger (nail) except thumb Non-Billable/Non-Specific Codes T23.629A..., initial encounterT23.629D..., subsequent encounterT23.629S..., sequela