ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.7 > T23.71 > T23.711 T23.711 Corrosion of third degree of right thumb (nail) Non-Billable/Non-Specific Codes T23.711A..., initial encounterT23.711D..., subsequent encounterT23.711S..., sequela