Bipolar disorder not otherwise specified

Last updated 4 November 2026

Bipolar disorder not otherwise specified (BD-NOS) is a diagnosis for bipolar disorder when it does not fit the other established subtypes. It is sometimes called subthreshold bipolar disorder. BD-NOS is a mood disorder on the bipolar spectrum, alongside bipolar I, bipolar II, and cyclothymia.

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Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.

Wikipedia: Bipolar disorder not otherwise specified (CC BY-SA 4.0).
Word definitions: the Codexery glossary, each quoted from its Wikipedia article.

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