ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.6 > T24.69 > T24.691 T24.691 Corrosion of second degree of multiple sites of right lower limb, except ankle and foot Non-Billable/Non-Specific Codes T24.691A..., initial encounterT24.691D..., subsequent encounterT24.691S..., sequela