ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.7 > T25.71 > T25.719 T25.719 Corrosion of third degree of unspecified ankle Non-Billable/Non-Specific Codes T25.719A..., initial encounterT25.719D..., subsequent encounterT25.719S..., sequela