ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.7 > T25.79 > T25.791 T25.791 Corrosion of third degree of multiple sites of right ankle and foot Non-Billable/Non-Specific Codes T25.791A..., initial encounterT25.791D..., subsequent encounterT25.791S..., sequela