ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.5 > T22.51 > T22.519 T22.519 Corrosion of first degree of unspecified forearm Non-Billable/Non-Specific Codes T22.519A..., initial encounterT22.519D..., subsequent encounterT22.519S..., sequela