What are the diagnostic criteria for Bipolar I disorder?

Bipolar I disorder is characterized primarily by the presence of at least one manic episode. A manic episode is defined as a distinct period of abnormally elevated or irritable mood, lasting at least one week, with associated symptoms such as increased energy, reduced need for sleep, racing thoughts, and possible involvement in high-risk activities. Although depressive episodes often occur in individuals with Bipolar I, they are not required for the diagnosis; thus, the critical factor is the presence of the manic or mixed episode.

Other options do not align with the established diagnostic criteria for Bipolar I disorder. Depressive episodes alone do not suffice for a diagnosis, nor are ongoing psychotic symptoms necessary for diagnosing this condition. Additionally, a diagnosis cannot be made without the presence of at least one manic episode, as that is central to the condition's definition.