Unspecified mononeuropathy of bilateral lower limbs

This code signifies a nerve disorder affecting both lower extremities, where a single nerve in each leg is damaged, but the specific nerve or cause is not identified. Patients typically present with symptoms such as numbness, tingling, weakness, or pain in both legs.

This code is appropriate when documentation indicates mononeuropathy affecting both lower limbs, but the physician has not specified the particular nerve involved (e.g., peroneal, tibial) or the etiology. It is used when a more specific diagnosis is not yet established or cannot be determined from the available clinical information.

• Avoid using this code if the specific nerve affected in each limb is documented; instead, code to the appropriate G57.x category.
• Do not use this code if the mononeuropathy is clearly unilateral; refer to G57.x1 or G57.x2.
• Always query the provider for greater specificity regarding the affected nerve(s) and laterality if possible, to allow for more precise coding.