ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.4 > T22.43 > T22.432 T22.432 Corrosion of unspecified degree of left upper arm Non-Billable/Non-Specific Codes T22.432A..., initial encounterT22.432D..., subsequent encounterT22.432S..., sequela