ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.4 > T25.43 T25.43 Corrosion of unspecified degree of toe(s) (nail) Non-Billable/Non-Specific Codes T25.431Corrosion of unspecified degree of right toe(s) (nail)T25.431A..., initial encounterT25.431D..., subsequent encounterT25.431S..., sequelaT25.432Corrosion of unspecified degree of left toe(s) (nail)T25.432A..., initial encounterT25.432D..., subsequent encounterT25.432S..., sequelaT25.439Corrosion of unspecified degree of unspecified toe(s) (nail)T25.439A..., initial encounterT25.439D..., subsequent encounterT25.439S..., sequela