ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.6 > T25.69 T25.69 Corrosion of second degree of multiple sites of ankle and foot Non-Billable/Non-Specific Codes T25.691Corrosion of second degree of right ankle and footT25.691A..., initial encounterT25.691D..., subsequent encounterT25.691S..., sequelaT25.692Corrosion of second degree of left ankle and footT25.692A..., initial encounterT25.692D..., subsequent encounterT25.692S..., sequelaT25.699Corrosion of second degree of unspecified ankle and footT25.699A..., initial encounterT25.699D..., subsequent encounterT25.699S..., sequela