ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.4 > T25.42 > T25.429 T25.429 Corrosion of unspecified degree of unspecified foot Non-Billable/Non-Specific Codes T25.429A..., initial encounterT25.429D..., subsequent encounterT25.429S..., sequela