Children aged 4 to 17 years who have a primary diagnosis of attention-deficit/hyperactivity disorder (ADHD) collectively made 6.1 million visits to physicians' offices in 2012-2013, new research shows. "Health care utilization related to ADHD is of interest because the prevalence of parent-reported ADHD diagnosis among US children and adolescents has increased in recent years," Michael Albert, MD, MPH, Hyattsville, Maryland, and colleagues write.