ICD-10-CM > S00-T88 > S50-S59 > S50 > S50.8 > S50.84 S50.84 External constriction of forearm Non-Billable/Non-Specific Codes S50.841External constriction of right forearmS50.841A..., initial encounterS50.841D..., subsequent encounterS50.841S..., sequelaS50.842External constriction of left forearmS50.842A..., initial encounterS50.842D..., subsequent encounterS50.842S..., sequelaS50.849External constriction of unspecified forearmS50.849A..., initial encounterS50.849D..., subsequent encounterS50.849S..., sequela