ICD-10-CM > S00-T88 > S40-S49 > S44 > S44.2 S44.2 Injury of radial nerve at upper arm level Non-Billable/Non-Specific Type 1 Excludes radial nerve NOS (S54.2) Codes S44.20Injury of radial nerve at upper arm level, unspecified armS44.20XA..., initial encounterS44.20XD..., subsequent encounterS44.20XS..., sequelaS44.21Injury of radial nerve at upper arm level, right armS44.21XA..., initial encounterS44.21XD..., subsequent encounterS44.21XS..., sequelaS44.22Injury of radial nerve at upper arm level, left armS44.22XA..., initial encounterS44.22XD..., subsequent encounterS44.22XS..., sequela