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Bipolar disorder NOS
Classification and external resources
ICD-10 f31.9
ICD-9 296.9

Bipolar Disorder NOS (Not Otherwise Specified) is a diagnosis for Bipolar Disorder (BD) when it does not fall within the other established sub-types[1] Sub-types of bipolar are part of the Bipolar Spectrum. Bipolar NOS is listed in the DSM-IV and DSM-IV-TR as diagnostic code 296.8.[2] It is estimated to affect 2.4% of the population, more than Bipolar I and Bipolar II combined.[3]


Bipolar Disorder is sometimes referred to as Manic-Depression, though the former term is now more common.
Bipolar Disorder NOS is sometimes referred to as Subthreshold Bipolar Disorder.

See also

National Institute of Mental Health: "Bipolar Spectrum Disorder May Be Underrecognized and Improperly Treated"


  1. DSM-IV-TR. Not Otherwise Specified (NOS)
  2. Diagnostic code 296.8
  3. Merikangas KR, et al. Lifetime and 12-Month Prevalence of Bipolar Spectrum Disorder in the National Comorbidity Survey Replication. Archives of General Psychiatry. May 2007; 64.


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