ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.6 > T22.63 > T22.631 T22.631 Corrosion of second degree of right upper arm Non-Billable/Non-Specific Codes T22.631A..., initial encounterT22.631D..., subsequent encounterT22.631S..., sequela