ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.4 > T22.41 > T22.411 T22.411 Corrosion of unspecified degree of right forearm Non-Billable/Non-Specific Codes T22.411A..., initial encounterT22.411D..., subsequent encounterT22.411S..., sequela