ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.4 > T22.41 T22.41 Corrosion of unspecified degree of forearm Non-Billable/Non-Specific Codes T22.411Corrosion of unspecified degree of right forearmT22.411A..., initial encounterT22.411D..., subsequent encounterT22.411S..., sequelaT22.412Corrosion of unspecified degree of left forearmT22.412A..., initial encounterT22.412D..., subsequent encounterT22.412S..., sequelaT22.419Corrosion of unspecified degree of unspecified forearmT22.419A..., initial encounterT22.419D..., subsequent encounterT22.419S..., sequela