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DSM-IV and DSM-IV-TR:

Bipolar II Disorder

Diagnosis of this Bipolar Disorder requires neither a Manic nor a Mixed Episode, but doesrequire at least one episode of hypomania in addition to anepisode of Major Depression.

Diagnostic criteria for 296.89 Bipolar II Disorder

A. Presence (or history) of one or more Major Depressive Episodes.

B. Presence (or history) of at least one Hypomanic Episode.

C. There has never been a Manic Episode or a Mixed Episode.

D. The mood symptoms in Criteria A and B are not better accounted for by Schizoaffective Disorder and are not superimposed on Schizophrenia, Schizophreniform Disorder, Delusional Disorder, or Psychotic Disorder Not Otherwise Specified.

E. The symptoms cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.

Specify current or most recent episode:

Hypomanic: if currently (or most recently) in a Hypomanic Episode
Depressed: if currently (or most recently) in a Major Depressive Episode

Specify (for current or most recent Major Depressive Episode only if it is the most recent type of mood episode):

Severity/Psychotic/Remission Specifiers Note: Fifth-digit codes specified on p. 377 cannot be used here because the code for Bipolar II Disorder already uses the fifth digit.
Chronic
With Catatonic Features
With Melancholic Features
With Atypical Features
With Postpartum Onset

Specify:

Longitudinal Course Specifiers (With and Without Interepisode Recovery)
With Seasonal Pattern (applies only to the pattern of Major Depressive Episodes)
With Rapid Cycling

Based on the Diagnostic & Statistical Manual of Mental Disorders, 4th edition APA

Research sources

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The online Diagnostic & Statistical Manual of Mental Disorders lists most of the major psychological disorders and illnesses and lists the criteria that must be fulfilled in order for a diagnosis to be made. This resource is not a substitute for proper professional psychiatric diagnosis.