A80-A89: Viral infections of the central nervous system

A85: Other viral encephalitis, not elsewhere classified

Other viral encephalitides, not elsewhere classified, involve a group of conditions where the brain becomes inflamed due to a viral infection. These conditions are usually contracted by direct exposure to viruses, often through biting insects or certain food and drink. They are not typically considered common, but when they do occur, symptoms might include fever, headache, nausea, or altered mental status such as confusion or seizures. Over time, symptoms may become more severe and could potentially involve motor function impairment or brain damage. However, disease progression will vary significantly depending on the specific virus involved. The area of the body chiefly affected by this group of conditions is the nervous system, particularly the brain, leading to the term 'encephalitis', meaning inflammation of the brain.