ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.5 > T22.53 > T22.531 T22.531 Corrosion of first degree of right upper arm Non-Billable/Non-Specific Codes T22.531A..., initial encounterT22.531D..., subsequent encounterT22.531S..., sequela