CPT® Code 92542

A positional nystagmus test is a diagnostic procedure that evaluates eye movements to identify the presence of nystagmus, which is characterized by rapid, involuntary eye motion. This test is crucial for diagnosing vestibular disorders that may lead to symptoms such as vertigo, dizziness, and balance disturbances. The procedure involves assessing eye movements in a minimum of four distinct positions, utilizing a technique known as electronystagmography (ENG) for accurate recording. During the test, the physician first observes the patient's eye movements visually before employing specialized recording equipment. This equipment includes horizontal electrodes strategically placed on the skin around the eyes to capture detailed data on eye movement. The standard positions for testing typically include head hanging forward, supine (lying on the back), and variations of supine with the head turned to the right or left, as well as lateral positions. The objective is to provoke and record any abnormal eye movements that may occur in response to specific head or body positions, which can indicate underlying functional disorders of the semicircular canals located in the middle ear. Following the test, the physician reviews the recorded data to analyze and interpret the results, aiding in the diagnosis and management of vestibular conditions.