ICD-10-CM > S00-T88 > S50-S59 > S54 > S54.2 S54.2 Injury of radial nerve at forearm level Non-Billable/Non-Specific Applicable To Injury of radial nerve NOS Codes S54.20Injury of radial nerve at forearm level, unspecified armS54.20XA..., initial encounterS54.20XD..., subsequent encounterS54.20XS..., sequelaS54.21Injury of radial nerve at forearm level, right armS54.21XA..., initial encounterS54.21XD..., subsequent encounterS54.21XS..., sequelaS54.22Injury of radial nerve at forearm level, left armS54.22XA..., initial encounterS54.22XD..., subsequent encounterS54.22XS..., sequela