G94: Other disorders of brain in diseases classified elsewhere

The conditions referred to as "Other disorders of brain in diseases classified elsewhere" involve a group of neurological disorders that occur as a secondary complication of diseases originating from different parts of the body. These other diseases may not directly involve the nervous system, but somehow they affect brain function disproportionately. Common causes can include systemic conditions such as heart disease, diabetes, or liver disease. The symptoms and progression of these secondary brain disorders vary greatly depending on the primary disease and may include cognitive impairment, changes in muscle tone, tremors, difficulty with movement, and even seizures in more severe instances. These disorders are not contagious as they arise from an individual's systemic disease. The very nature of these conditions means they unfold and develop uniquely in every individual, mirroring the progression of the primary disease. This makes them complex and variable, but all underscore the intricate interconnectivity of the human body's systems.