CPT® Code 92516

1. Indications

Facial nerve function studies are indicated for a variety of conditions and symptoms that may suggest dysfunction of the facial nerve. These include:

• Bell's Palsy A sudden onset of facial weakness or paralysis, often on one side of the face, which may indicate facial nerve involvement.
• Facial Nerve Tumors The presence of tumors affecting the facial nerve can lead to symptoms requiring evaluation of nerve function.
• Traumatic Injuries Injuries to the head or face that may compromise the integrity of the facial nerve necessitate assessment through these studies.
• Neurological Disorders Conditions such as multiple sclerosis or other neurological diseases that may impact facial nerve function.

2. Procedure

The procedure for facial nerve function studies, specifically electroneuronography (ENoG), involves several key steps to ensure accurate assessment of the facial nerve's integrity.

• Step 1: The patient is positioned comfortably, and the area around the ears is prepared for electrode placement. This preparation may include cleaning the skin to ensure good electrical contact.
• Step 2: Stimulating electrodes are placed bilaterally near the earlobe. The cathode (negative) electrode is positioned posteriorly to each ear, while the anode (positive) electrode is placed anteriorly to each ear. This setup is crucial for effective stimulation of the facial nerve.
• Step 3: Recording electrodes are then placed bilaterally at or near the stylomastoid foramen, which is the exit point of the facial nerve from the skull, and at or near the nasolabial fold, where facial muscle activity can be monitored.
• Step 4: The facial nerve on the unaffected side is electrically stimulated, and the muscle response is recorded. This serves as a baseline for comparison.
• Step 5: Subsequently, the affected or abnormal side is electrically stimulated, and the facial nerve muscle response is recorded. This step is critical for identifying any discrepancies in nerve function between the two sides.
• Step 6: The responses from both sides are compared, and a written interpretation of the results is generated, providing insights into the functional status of the facial nerve.

3. Post-Procedure

After the facial nerve function studies are completed, patients may be monitored briefly to ensure there are no immediate adverse reactions to the procedure. Typically, there are no significant post-procedure care requirements, and patients can resume their normal activities shortly after the study. However, it is essential for healthcare providers to review the results with the patient and discuss any further diagnostic or therapeutic steps that may be necessary based on the findings. Follow-up appointments may be scheduled to monitor the patient's condition and response to any treatments initiated as a result of the study.