The Diagnostic and Statistical Manual of Mental Disorders (DSM) published by the American Psychiatric Association provides a common language and standard criteria for the classification of mental disorders. The DSM is used in the United States and to various degrees around the world. It is used or relied upon by clinicians, researchers, psychiatric drug regulation agencies, health insurance companies, pharmaceutical companies, the legal system, and policy makers. The current version, published on May 18, 2013, is the DSM-5 (fifth edition). [Wikipedia]
The World Health Organization maintains the International Classification of Diseases (ICD). This standard diagnostic tool is used for epidemiology, health management and clinical purposes.
Chapter 6 focuses on mental, behavioural or neurodevelopmental disorders, and can complement information found in the DSM-5.