ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.7 > T24.73 > T24.739 T24.739 Corrosion of third degree of unspecified lower leg Non-Billable/Non-Specific Codes T24.739A..., initial encounterT24.739D..., subsequent encounterT24.739S..., sequela