ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.5 > T24.59 > T24.599 T24.599 Corrosion of first degree of multiple sites of unspecified lower limb, except ankle and foot Non-Billable/Non-Specific Codes T24.599A..., initial encounterT24.599D..., subsequent encounterT24.599S..., sequela