ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.4 > T25.41 > T25.411 T25.411 Corrosion of unspecified degree of right ankle Non-Billable/Non-Specific Codes T25.411A..., initial encounterT25.411D..., subsequent encounterT25.411S..., sequela