A predominant feature in these conditions is a clinically significant deficit in cognition that is different from a previous level of functioning.
A brief description of each of these condition categories is given below:
1. Delirium: This condition is characterized by a change of consciousness and a change in cognition which develop over a short period of time. The etiology may be a general medical condition; substance-induced; multiple etiologies; and indeterminate. The condition is coded 293.0 on DSM-IV.
2. Dementia: This condition is characterized by multiple cognitive deficits including memory impairment. The dementia may be Alzheimer’s Dementia, Vascular Dementia, due to medical conditions such as AIDS, head trauma, Parkinson’s disease, Huntington’s disease, substance-induced persisting dementia, and due to multiple etiologies. The condition is coded 294.xx on DSM-IV.
3. Amnestic Disorder: This condition is characterized by memory impairment when other significant accompanying impairments are not present. The condition may present itself due to a general medical condition, due to substance abuse, or some other indeterminate cause. The condition is coded 294.0 on DSM-IV.
4. Cognitive Disorder Not Otherwise Specified: This connotes some general medical condition or substance abuse that do not meet any of the other criteria. The condition is coded 294.9 on DSM-IV.