Lesion of lateral popliteal nerve, left lower limb

This code signifies damage or dysfunction of the lateral popliteal nerve (also known as the common peroneal nerve) affecting the left lower extremity. This can manifest as foot drop, numbness, tingling, or weakness in the ankle and foot, particularly in the dorsiflexion and eversion movements. The lesion can result from trauma, compression, or systemic conditions.

Apply this code when documentation clearly indicates a diagnosed lesion or neuropathy of the left common peroneal nerve. This includes conditions like peroneal nerve palsy, entrapment neuropathy, or injury to the nerve due to fracture or external compression. Supporting documentation should specify the affected nerve and laterality.

• Ensure laterality is explicitly documented as "left" to support this specific code.
• Distinguish from G57.31 (right lateral popliteal nerve lesion) and G57.30 (unspecified laterality).
• Consider an external cause code (V00-Y99) if the lesion is due to an injury, along with a seventh character for encounter type.