What categories is Neurocognitive Disorder broken into? a. Major and Mild b. Adult and Elderly c. Alzheimer’s and Traumatic Brain Injury d. Chemical and Biological Previously cognitive disorders that can occur across the lifespan were combined into one category. The DSM-5 now has distinguished Neurocognitive Disorders into the categories of "major" and "mild" making it easier to provide clearer diagnosis when defining the levels of cognitive impairment.