ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.4 > T24.43 > T24.431 T24.431 Corrosion of unspecified degree of right lower leg Non-Billable/Non-Specific Codes T24.431A..., initial encounterT24.431D..., subsequent encounterT24.431S..., sequela