ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.5 > T25.53 T25.53 Corrosion of first degree of toe(s) (nail) Non-Billable/Non-Specific Codes T25.531Corrosion of first degree of right toe(s) (nail)T25.531A..., initial encounterT25.531D..., subsequent encounterT25.531S..., sequelaT25.532Corrosion of first degree of left toe(s) (nail)T25.532A..., initial encounterT25.532D..., subsequent encounterT25.532S..., sequelaT25.539Corrosion of first degree of unspecified toe(s) (nail)T25.539A..., initial encounterT25.539D..., subsequent encounterT25.539S..., sequela