ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.4 > T24.41 > T24.419 T24.419 Corrosion of unspecified degree of unspecified thigh Non-Billable/Non-Specific Codes T24.419A..., initial encounterT24.419D..., subsequent encounterT24.419S..., sequela