Objective: The present study investigated concordance between DSM-IV and DSM-5 criteria for delirium diagnosis referred to a consultation-liaison psychiatry unit at a University Hospital in Bangkok, Thailand.

Materials and Methods: A retrospective chart review was conducted on delirium patients who were consulted to the psychiatric consultation-liaison unit of the hospital form September 2013 to June 2015.

Results: Delirium was found in 252 subjects, most were male in age >65 years old. Using DSM-IV Criteria, 177 cases (70.2%) were identified as delirium. Using Strict DSM-5 criteria, 163 cases (64.7%) were identified as delirium. Furthermore, using Relaxed DSM-5 criteria, 200 cases (79.4%) were identified as delirium. There were 163 cases (64.7%) were identified as delirium by all three approaches. The concordance between the different diagnostic methods was: 95% (K = 0.89) between DSM-IV and the strict DSM-5, 91% (K = 0.75) between the DSM-IV and relaxed DSM-5 criteria and 86% (K = 0.66) between the strict versus relaxed DSM-5 criteria.

Conclusion: Degree of concordance in the present study is at a good level.

Keywords: Delirium, Classification, Diagnosis, Criteria, Neurocognitive disorder