Clinical neurophysiology is the study of nervous system disorders. A neurophysiologist is a neurologist or psychiatrist who specializes in the diagnosis and management of nervous system disorders using a combination of clinical evaluation and technical device testing, such as electroencephalography (EEG) or electromyography (EMG). These test results are interpreted by the neurophysiologist and communicated to the patient to treat nervous system disorders, such as carpal tunnel syndrome or a ruptured disc in the spine causing sciatica.

Doctor density varies by specialty and location. The United States has 1,258 practicing clinical neurophysiologists. Broken out by state, clinical neurophysiology doctor density in Alabama is 14, in Alaska is 1, in Arizona is 36, in Arkansas is 10, in California is 142, in Colorado is 10, in Connecticut is 19, in Delaware is 9, in District of Columbia is 33, in Florida is 75, in Georgia is 34, in Hawaii is 4, in Idaho is 4, in Illinois is 86, in Indiana is 34, in Iowa is 9, in Kansas is 12, in Kentucky is 22, in Louisiana is 18, in Maine is 10, in Maryland is 53, in Massachusetts is 61, in Michigan is 56, in Minnesota is 45, in Mississippi is 14, in Missouri is 41, in Montana is 1, in Nebraska is 5, in Nevada is 5, in New Hampshire is 7, in New Jersey is 61, in New Mexico is 7, in New York is 165, in North Carolina is 41, in North Dakota is 5, in Ohio is 89, in Oklahoma is 5, in Oregon is 18, in Pennsylvania is 86, in Rhode Island is 19, in South Carolina is 12, in South Dakota is 2, in Tennessee is 31, in Texas is 110, in Utah is 11, in Vermont is 5, in Virginia is 39, in Washington is 28, in West Virginia is 11, and in Wisconsin is 33.