ICD-10-CM > S00-T88 > S40-S49 > S40 > S40.8 > S40.82 > S40.822 S40.822 Blister (nonthermal) of left upper arm Non-Billable/Non-Specific Codes S40.822A..., initial encounterS40.822D..., subsequent encounterS40.822S..., sequela