ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.7 > T22.71 > T22.719 T22.719 Corrosion of third degree of unspecified forearm Non-Billable/Non-Specific Codes T22.719A..., initial encounterT22.719D..., subsequent encounterT22.719S..., sequela