Bipolar Disorder

Bipolar Disorder is indexed under Mental Health & Behavioral, Mood Disorders. Also known as bipolar I, bipolar II, manic-depressive illness.

US prevalence

~7 million (~2.8% of adults for bipolar I+II) Source: NIMH; NCS-R. Federal source. Label: VERIFIED.

ICD-10-CM codes

F31, F31.9

Typical onset

Mean onset ~25 years; often diagnosed in late teens/early 20s

Course

episodic

Body systems

psychiatric

Sex differences

Bipolar I: equal; Bipolar II: slightly more common in women

Racial and ethnic differences

Similar prevalence across racial groups; disparities in misdiagnosis (Black patients more often misdiagnosed with schizophrenia)

What this page does not establish

These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.

Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.

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