ICD-10-CM > S00-T88 > S40-S49 > S40 > S40.8 > S40.84 S40.84 External constriction of upper arm Non-Billable/Non-Specific Codes S40.841External constriction of right upper armS40.841A..., initial encounterS40.841D..., subsequent encounterS40.841S..., sequelaS40.842External constriction of left upper armS40.842A..., initial encounterS40.842D..., subsequent encounterS40.842S..., sequelaS40.849External constriction of unspecified upper armS40.849A..., initial encounterS40.849D..., subsequent encounterS40.849S..., sequela