The diagnostic criteria and codes used for psychological disorders are provided by DSM-5, that is, the Diagnostic and Statistical Manual of Mental Disorders in the country of US.
Psychological disorders are illnesses relating to a person's mental health. It can be anxiety, stress, depression, etc., and other psychiatric disorders.
The Diagnostic and Statistical Manual of Mental Disorders (DSM-5), prescribes a standard bifurcation of mental disorders in descriptive text. These codes are used by psychologists and psychiatrists in America to communicate the diagnostic criteria for their patient's mental illnesses.
Therefore, the treatment for psychological disorders is to be guided by the DSM-5 manual.
Learn more about the DSM-5 in the provided link:
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