sentations in a variety of clinical settings—inpatient, outpatient, partial hospital, consul-
tation-liaison, clinical, private practice, an d primary care—as well in general community
epidemiological studies of mental disorders.  DSM-5 is also a tool for collecting and com-
municating accurate public health statistics  on mental disorder morbidity and mortality
rates. Finally, the criteria and corresponding text serve as a textbook for students early in
their profession who need a structured way to  understand and diagnose mental disorders
as well as for seasoned professionals encounteri ng rare disorders for the first time. Fortu-
nately, all of these uses are mutually compatible.
These diverse needs and interests were take n into consideration in planning DSM-5.
The classification of disorders is harmoniz ed with the World Health Organization’s Inter-
national Classification of Diseases  (ICD), the official coding system used in the United States,
so that the DSM criteria define disorders identified by ICD diagnostic names and code
numbers. In DSM-5, both ICD-9-CM and ICD- 10-CM codes (the latter scheduled for adop-
tion in October 2014) are attached to the relevant disorders in the classification.
Although DSM-5 remains a catego rical classification of sepa rate disorders, we recog-
nize that mental disorders do not always fit completely within the boundaries of a single
disorder. Some symptom domains, such as de pression and anxiety, involve multiple di-
agnostic categories and may reflect common underlying vulnerabilities for a larger group
of disorders. In recognition of  this reality, the disorders in cluded in DSM-5 were reordered
into a revised organizational structure meant to stimulate new clinical perspectives. This
new structure corresponds with the organizational arrangement of disorders planned for