Final answer:
The false statement about DSM-5 is that it relies solely on the psychological model; it actually includes both psychological and medical perspectives to classify mental disorders.
Step-by-step explanation:
The statement that is false about the DSM-5 is that it relies on the psychological rather than the medical model of mental illness to describe mental disorders. The DSM-5 indeed describes the symptoms of approximately 400 mental disorders, was updated most recently in 2013, and it does reflect a predominantly Western European and American perspective on mental disorders.
However, it incorporates both psychological and medical models to understand and classify mental disorders. For example, substance use disorders in the DSM-5 are defined with criteria that reflect a pattern of behavior as well as the potential for physiological dependence, demonstrating the integration of medical criteria.