Mononeuritis of lower limb, unspecified

This code signifies inflammation or damage to a single peripheral nerve in the lower extremity, where the specific nerve affected is not documented. It represents a localized neuropathy impacting motor, sensory, or mixed nerve function in the leg or foot.

Use this code when documentation indicates mononeuritis of the lower limb, but the specific nerve (e.g., femoral, sciatic, peroneal, tibial) is not identified. This is appropriate for initial evaluations or when diagnostic workup is incomplete, and the physician has not specified the exact nerve involved.

• Avoid using this code if a more specific lower limb mononeuritis code (e.g., 355.0-355.7) can be assigned based on documentation.
• Query the provider for clarification if the medical record suggests a specific nerve but doesn't explicitly state it.
• Consider underlying causes (e.g., diabetes, trauma) and code them as additional diagnoses when documented.