Lesion of radial nerve, right upper limb

This code signifies a specific lesion or injury affecting the radial nerve in the patient's right upper extremity. This could manifest as nerve compression, entrapment, or damage, leading to sensory and/or motor deficits in the areas innervated by the radial nerve. Common presentations include wrist drop, weakness in forearm extension, or numbness along the back of the hand and thumb.

Use this code when documentation clearly indicates a diagnosis of a radial nerve lesion or neuropathy specifically affecting the right upper limb. This diagnosis is typically supported by clinical examination findings, electrodiagnostic studies (e.g., NCS/EMG) confirming radial nerve involvement, or imaging studies identifying a causative lesion.

• Ensure laterality is explicitly documented as "right" to support this specific code.
• Distinguish from other mononeuropathies of the upper limb (e.g., median or ulnar nerve lesions) based on nerve distribution.
• If the cause of the lesion is known (e.g., fracture, external compression), consider coding the underlying condition first, followed by this code.