ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.6 > T25.63 T25.63 Corrosion of second degree of toe(s) (nail) Non-Billable/Non-Specific Codes T25.631Corrosion of second degree of right toe(s) (nail)T25.631A..., initial encounterT25.631D..., subsequent encounterT25.631S..., sequelaT25.632Corrosion of second degree of left toe(s) (nail)T25.632A..., initial encounterT25.632D..., subsequent encounterT25.632S..., sequelaT25.639Corrosion of second degree of unspecified toe(s) (nail)T25.639A..., initial encounterT25.639D..., subsequent encounterT25.639S..., sequela