ICD-10-CM > S00-T88 > S40-S49 > S40 > S40.8 > S40.82 > S40.829 S40.829 Blister (nonthermal) of unspecified upper arm Non-Billable/Non-Specific Codes S40.829A..., initial encounterS40.829D..., subsequent encounterS40.829S..., sequela