CPT® Code 95930

Visual evoked potential (VEP) checkerboard or flash testing, central nervous system except glaucoma, with interpretation and report

Visual evoked potential (VEP) testing, also known as visually evoked response (VER) and visually evoked cortical potential (VECP), is a diagnostic procedure utilized to assess the functionality of the visual pathways within the central nervous system, excluding conditions related to glaucoma. The visual pathways begin at the retina, extend through the optic nerves, and culminate in the visual cortex of the brain. This testing method employs scalp electrodes to capture the electrical potentials generated in response to brief visual stimuli. During the procedure, the planned electrode sites on the scalp are meticulously cleansed to ensure optimal conductivity, and both recording and grounding electrodes are strategically positioned. The visual stimuli can be delivered in two primary forms: a flash of light or a checkerboard pattern. The flash stimulus involves a strobe light that rapidly alternates on and off, while the checkerboard stimulus consists of a black and white pattern that reverses colors at half-second intervals. As the patient concentrates on the checkerboard, the VEP waveforms are recorded, allowing for the extraction of data from an electroencephalogram through signal averaging techniques. The resulting waveforms are displayed on a computer screen and can also be printed for further analysis. Following the test, the physician meticulously reviews the recorded waveforms and generates a comprehensive written interpretation and report detailing the findings of the VEP test.