CPT® Code 95904

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Nerve conduction studies (NCS) are diagnostic tests utilized to assess the functionality of peripheral nerves. These studies are particularly important for identifying nerve damage and various nerve disorders, including conditions such as carpal tunnel syndrome. Patients may present with symptoms like numbness, tingling, or other abnormal sensations, which can indicate underlying nerve issues. During the procedure, several flat metal disc electrodes are affixed to the skin using paste or tape to ensure proper contact. A shock-emitting electrode is strategically placed over the nerve being evaluated, while a recording electrode is positioned over the muscles that the nerve innervates. When electrical pulses are transmitted through the shock-emitting electrode, the conduction time is measured, which reflects how quickly the muscle contracts in response to the stimulus. Additionally, the amplitude, or strength, of the muscle response, along with the latency or velocity of the nerve impulse, is recorded. After the completion of the study, the physician analyzes the collected data and generates a comprehensive written report detailing the findings. For accurate coding, it is essential to use the appropriate CPT® codes based on the type of nerve conduction study performed, such as 95900 for motor nerve conduction studies without F-wave study, 95903 for those with F-wave study, and 95904 for sensory nerve conduction studies, which focus on the impulse travel time along the sensory nerve.