CPT® Code 95904

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1. Indications

The nerve conduction study is indicated for the evaluation of various symptoms and conditions that may suggest nerve dysfunction. These include:

• Carpal Tunnel Syndrome - A condition characterized by compression of the median nerve at the wrist, leading to symptoms such as pain, numbness, and tingling in the hand and fingers.
• Nerve Damage - Assessment of peripheral nerve injuries resulting from trauma, compression, or other pathological processes.
• Peripheral Neuropathy - Evaluation of nerve disorders that can cause weakness, numbness, and pain, often associated with diabetes or other systemic diseases.
• Radiculopathy - Investigation of nerve root compression that may lead to pain, weakness, or sensory changes in the limbs.
• Other Abnormal Sensations - Diagnosis of unexplained symptoms such as tingling, burning, or loss of sensation in the extremities.

2. Procedure

The nerve conduction study involves several key procedural steps to ensure accurate assessment of nerve function. Each step is critical for obtaining reliable data.

• Preparation of the Patient - The patient is positioned comfortably, and the skin over the area of interest is cleaned to ensure good electrode contact. The physician explains the procedure to the patient to alleviate any anxiety and ensure cooperation.
• Electrode Placement - Flat metal disc electrodes are attached to the skin using paste or tape. The placement is crucial as it directly affects the quality of the recordings. The shock-emitting electrode is positioned over the nerve to be studied, while the recording electrode is placed over the corresponding muscle innervated by that nerve.
• Stimulation of the Nerve - Electrical pulses are delivered through the shock-emitting electrode. This stimulation causes the nerve to activate, and the resulting muscle contraction is measured. The intensity and duration of the electrical stimulus are carefully controlled to ensure patient safety and comfort.
• Recording of Responses - The conduction time, which is the interval from the stimulus to the muscle contraction, is recorded. Additionally, the amplitude of the muscle response is measured, providing information about the strength of the nerve signal. The latency or velocity of the response is also calculated, which reflects the speed of nerve conduction.
• Data Analysis - After the completion of the study, the physician reviews the recorded data. This analysis is essential for diagnosing any nerve disorders and determining the appropriate course of action based on the findings.

3. Post-Procedure

Post-procedure care for nerve conduction studies is generally minimal, as the procedure is non-invasive and well-tolerated by most patients. Patients may resume their normal activities immediately following the study. However, they may be advised to avoid strenuous activities or heavy lifting for a short period if they experience any discomfort at the electrode sites. The physician will provide a written report of the findings, which will be discussed with the patient during a follow-up appointment. This report is crucial for determining the next steps in management or treatment based on the results of the nerve conduction study.