ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.4 > T24.41 > T24.412 T24.412 Corrosion of unspecified degree of left thigh Non-Billable/Non-Specific Codes T24.412A..., initial encounterT24.412D..., subsequent encounterT24.412S..., sequela