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