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