ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.5 > T24.53 > T24.531 T24.531 Corrosion of first degree of right lower leg Non-Billable/Non-Specific Codes T24.531A..., initial encounterT24.531D..., subsequent encounterT24.531S..., sequela