ICD-10-CM > S00-T88 > S40-S49 > S41 > S41.1 > S41.10 > S41.109 S41.109 Unspecified open wound of unspecified upper arm Non-Billable/Non-Specific Codes S41.109A..., initial encounterS41.109D..., subsequent encounterS41.109S..., sequela