Medical Terminology

Diagnostic and Statistical Manual of Mental Disorders (DSM)

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The Diagnostic and Statistical Manual of Mental Disorders (DSM) is an authoritative volume produced by the APA (American Psychiatric Association) that defines and classifies mental disorders (including many neurological disorders) in order to improve diagnoses, treatment, and research. The 5th edition (DSM-5) is the 2013 update and a product of more than 10 years of effort by hundreds of international experts in all aspects of mental health.

See HF’s IH Summary for the DSM-5’s diagnostic criteria for hypersomnolence disorder (i.e., their equivalent for the ICSD-3’s idiopathic hypersomnia diagnosis). 

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