Lesion of lateral popliteal nerve, bilateral lower limbs

This code signifies damage or dysfunction affecting the peroneal nerve (also known as the lateral popliteal nerve) in both lower extremities. This condition typically results in weakness or paralysis of the muscles that lift the foot (dorsiflexion) and turn it outward (eversion), leading to a "foot drop" gait. Sensory disturbances, such as numbness or tingling, may also be present along the outer lower leg and top of the foot.

Apply this code when documentation clearly indicates a lesion or neuropathy of the lateral popliteal nerve affecting both the right and left lower limbs. This diagnosis is supported by findings from neurological examinations, nerve conduction studies (NCS), and electromyography (EMG) confirming bilateral peroneal nerve involvement.

• Ensure documentation specifies bilateral involvement; otherwise, a unilateral code (G57.31 or G57.32) would be more appropriate.
• Distinguish from other mononeuropathies of the lower limb (G57.x) by confirming the specific nerve affected is the lateral popliteal/peroneal.
• Code any underlying cause of the lesion (e.g., trauma, compression, systemic disease) as an additional diagnosis.