Bipolar II disorder

This code signifies a mood disorder characterized by at least one hypomanic episode and at least one major depressive episode. Unlike Bipolar I, there are no full manic episodes, and the hypomanic episodes are not severe enough to cause marked impairment or require hospitalization.

Apply this code when documentation clearly indicates a diagnosis of Bipolar II disorder, supported by a history of both hypomanic and major depressive episodes. Ensure the clinician explicitly states "Bipolar II disorder" or provides sufficient detail to differentiate it from Bipolar I or cyclothymic disorder.

• Differentiate carefully from Bipolar I (F31.1x, F31.2, F31.9) which involves manic episodes.
• Do not use if only depressive episodes are documented; consider F32.x or F33.x.
• Requires physician documentation of the specific Bipolar II diagnosis.