ICD-10-CM > S00-T88 > S40-S49 > S40 > S40.2 > S40.22 > S40.221 S40.221 Blister (nonthermal) of right shoulder Non-Billable/Non-Specific Codes S40.221A..., initial encounterS40.221D..., subsequent encounterS40.221S..., sequela