ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.4 > T22.43 > T22.431 T22.431 Corrosion of unspecified degree of right upper arm Non-Billable/Non-Specific Codes T22.431A..., initial encounterT22.431D..., subsequent encounterT22.431S..., sequela