ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.4 > T25.41 > T25.419 T25.419 Corrosion of unspecified degree of unspecified ankle Non-Billable/Non-Specific Codes T25.419A..., initial encounterT25.419D..., subsequent encounterT25.419S..., sequela