ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.62 T23.62 Corrosion of second degree of single finger (nail) except thumb Non-Billable/Non-Specific Codes T23.621Corrosion of second degree of single right finger (nail) except thumbT23.621A..., initial encounterT23.621D..., subsequent encounterT23.621S..., sequelaT23.622Corrosion of second degree of single left finger (nail) except thumbT23.622A..., initial encounterT23.622D..., subsequent encounterT23.622S..., sequelaT23.629Corrosion of second degree of unspecified single finger (nail) except thumbT23.629A..., initial encounterT23.629D..., subsequent encounterT23.629S..., sequela