ICD-10-CM > S00-T88 > S50-S59 > S54 > S54.2 > S54.20 S54.20 Injury of radial nerve at forearm level, unspecified arm Non-Billable/Non-Specific Codes S54.20XA..., initial encounterS54.20XD..., subsequent encounterS54.20XS..., sequela