12 Introduction
may not fully capture the complexity and hete rogeneity of mental di sorders. The revised
organization is coordinated with the mental and behavioral disorders chapter (Chapter V)
of ICD-11, which will utilize an expanded numeric–alphanumeric coding system. How-
ever, the official coding system in use in the Un ited States at the time  of publication of this
manual is that of the International Classificatio n of Diseases, Ninth Revi sion, Clinical Modifica-
tion (ICD-9-CM)—the U.S. adaptation of ICD-9. International Classificat ion of Diseases, Tenth
Revision, Clinical Modification  (ICD-10-CM), adapted from IC D-10, is scheduled for imple-
mentation in the United States in October 2014. Given the impending release of ICD-11, it
was decided that this iteration, and not ICD-10, would be the most relevant on which to focus
harmonization. However, given that adoption of the ICD-9-CM coding system will remain
at the time of the DSM-5 releas e, it will be necessary to use the ICD-9-CM codes. Further-
more, given that DSM-5’s organizational stru cture reflects the an ticipated structure of
ICD-11, the eventual ICD-11 co des will follow the sequential  order of diagnoses in the
DSM-5 chapter structure more closely. At present, both the ICD-9-CM and the ICD-10-CM
codes have been indicated for each disorder. These codes will not be in sequential order
throughout the manual because they were assigned to complement earlier organizational
structures.
Dimensional Approach to Diagnosis
Structural problems rooted in the basic de sign of the previous DSM classification, con-