ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.5 > T25.51 > T25.519 T25.519 Corrosion of first degree of unspecified ankle Non-Billable/Non-Specific Codes T25.519A..., initial encounterT25.519D..., subsequent encounterT25.519S..., sequela