ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.61 > T23.611 T23.611 Corrosion of second degree of right thumb (nail) Non-Billable/Non-Specific Codes T23.611A..., initial encounterT23.611D..., subsequent encounterT23.611S..., sequela