What guidebook serves as the "official" basis for the diagnosis of psychopathology?

Question

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The Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) is widely regarded as the "official" guidebook for the diagnosis of psychopathology in the United States. It is published by the American Psychiatric Association and serves as a standard reference for clinicians, researchers, and insurance providers. The International Statistical Classification of Diseases and Related Health Problems, 11th Edition (ICD-11) is another commonly used classification system for mental disorders, but it is more widely used outside of the United States. The Physicians' Desk Reference, 7th Edition (PDR-71) and Psychological Disorders and Their Treatment, 2nd Edition (PDTT2) are not relevant to the diagnosis of psychopathology.

What Guidebook Serves as the "Official" Basis for the Diagnosis