This is a category that includes disorders with bipolar features that do not meet the criteria for any specific Bipolar Disorder. Examples are:

• Very rapid alternation between manic symptoms and depressive symptoms that meet symptom criteria threshold but not duration required.

• Recurrent Hypomanic Episodes without intercurrent depressive symptoms

• A Manic or Mixed Episode superimposed on Delusional Disorder, residual Schizophrenia, Psychotic Disorder Not Otherwise Specified.

• Hypomanic Episodes, along with chronic depressive symptoms that are too infrequent to qualify for a diagnosis of Cyclothymic Disorder.

• Situations in which the clinician has concluded that a Bipolar Disorder but it unstable to determine whether it is primary, due to a general medical condition, or a substance.