ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.5 > T24.51 > T24.519 T24.519 Corrosion of first degree of unspecified thigh Non-Billable/Non-Specific Codes T24.519A..., initial encounterT24.519D..., subsequent encounterT24.519S..., sequela