ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.7 > T25.73 > T25.731 T25.731 Corrosion of third degree of right toe(s) (nail) Non-Billable/Non-Specific Codes T25.731A..., initial encounterT25.731D..., subsequent encounterT25.731S..., sequela