What is the primary reason the DSM-5 is used to diagnose mental disorders? January 1, 2023 by admin It provides detailed information about mental disorders,such as prevalence rates,course,and differential diagnoses how to distinguish one disorder from a similar one). It is convenient and does not require much training to learn how to use. It provides clinicians with treatment plan suggestions for each disorder. It is standardized for use across disciplines and across treatment settings. See Answer It is standardized for use across disciplines and across treatment settings.