DSM-5 Neurocognitive Disorders: Validity, Reliability, Fairness, and Utility in Forensic Applications

A previously published paper (Schultz Psychological Injury and Law 3: 271–288, 2010) on forensic considerations regarding neurocognitive disorders within the Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5; American Psychiatric Association, 2013) reviewed evidence for internal and external validity, as well as the fairness and utility of the proposed classification. Given recent publication of the DSM-5, in May 2013, the current paper provides an update on this review. It focuses on changes in the final version of the neurocognitive disorders section of the DSM-5 as compared with the earlier proposal in 2010 and raises a range of new conceptual, methodological, and clinical practice issues related to this classification. An examination of forensic neuropsychologists’ diagnostic choices and their associated pitfalls follows. Discussion extends to the unresolved issue of disorder threshold, associated risks of overdiagnosis of mild neurocognitive disorder and underdiagnosis of major neurocognitive disorder, and the absence of a moderately severe disorder classification. Methodological concerns in diagnostic determinations, especially with DSM-5 Criteria A and B, issues associated with subtypes and specifiers, as well as functional assessments of activities of daily living, now embedded in the diagnosis, follow. Subtype omissions and methodological inconsistencies are highlighted.The vulnerability of neuropsychologists and psychiatrists during courtroom testimony on neurocognitive disorders-particularly with conceptual, methodological, and practical issues-will be addressed through clinical and forensic practice recommendations.