ICD-10-CM > S00-T88 > S40-S49 > S44 > S44.2 > S44.20 S44.20 Injury of radial nerve at upper arm level, unspecified arm Non-Billable/Non-Specific Codes S44.20XA..., initial encounterS44.20XD..., subsequent encounterS44.20XS..., sequela