Diagnostic and Statistical Manual of Mental Disorders (DSM), a manual, published by the American Psychiatric Association, listing the official diagnostic classifications of mental disorders. Each of the classifications of the mental disorders contains a code that provides a reference to the WHO International Classification of Diseases and offers such useful diagnostic criteria as essential and associated features of the disorder, age at onset, course, impairment, complications, predisposing factors, prevalence, sex ratio, familial patterns, and differential diagnoses. DSM-5, published in 2013, is the fifth edition of the manual.
