Trends in diagnosis of bipolar and disruptive mood dysregulation disorders in children and youth

Objective: : Rates of pediatric bipolar disorders have increased and some are concerned about diagnostic accuracy. Disruptive mood dysregulation disorder (DMDD) was added to the DSM-5 in 2013. The purpose of this study was to assess diagnostic trends of bipolar disorders and DMDD and to identify predictors of receiving the DMDD diagnosis since implementation of DSM-5. Method: : Kentucky Medicaid claims from 2012–2017 for children under 18 years (N = 814,919; 2012 n = 473,389; 2013 n = 470,918; 2014 n = 499,094; 2015 n = 517,199; 2016 n = 529,048; 2017 n = 535,814) were used. Logistic regression was used to identify predictors of a diagnosis of DMDD in 2015–2017 for a sub-sample (n = 5,071). Results: : The use of DMDD rose after 2013 and mood disorder NOS decreased steadily through 2017. This decrease was seen when there was a diagnosis of bipolar and oppositional defiant disorder (ODD) combined with mood disorder NOS. A diagnosis of only mood disorder NOS in 2012 did not predict DMDD in 2015–2017, but the same diagnosis in 2013 was predictive (OR 2.14, p = 0.049). The reverse is true for a diagnosis of only ADHD in 2013, which did not predict DMDD in later years, but its presence in 2012 was predictive (OR 1.36, p = 0.010). Conclusions: : DMDD increased after 2013, and this was associated with a diagnosis of mood disorder NOS, ADHD, as well as with bipolar disorders comorbid with ODD. Given the complexity of comorbid diagnoses, DMDD may be more accurate in classifying some children. Administrative claims data have limitations, which are discussed; and the data represent only children living in Kentucky.