Lesion of radial nerve, left upper limb

This code signifies damage or dysfunction of the radial nerve specifically affecting the left upper extremity. This can manifest as motor weakness (e.g., wrist drop, inability to extend fingers) or sensory deficits (e.g., numbness, tingling) in the distribution of the radial nerve.

Apply this code when documentation clearly indicates a diagnosed lesion, neuropathy, or injury affecting the radial nerve in the patient's left arm. Supporting documentation should include physician notes detailing the location (left upper limb) and nature of the radial nerve involvement.

• Ensure laterality is explicitly documented as "left" to support this specific code.
• Distinguish from other mononeuropathies of the upper limb; confirm radial nerve involvement.
• Consider an external cause code if the lesion is due to trauma (e.g., fracture, laceration).