This Statistical Brief presents data from the Healthcare Cost and Utilization Project (HCUP) Nationwide Emergency Department Sample (NEDS) on MHSA-related ED visits among adults in 2007. Specifically, patient and utilization characteristics of ED visits for MHSA are discussed and compared with all other types of ED visits. The distribution of MHSA-related ED visits are presented by age and primary expected payer. The MHSA conditions described here include those conditions found in the Diagnostic and Statistics Manual of Mental Disorders, Fourth Edition, excluding dementia and intellectual disabilities. The Brief also provides information about the types of MHSA conditions by age and primary expected payer. In addition to prevalence estimates, data on the likelihood of hospital admission are presented. Estimates are based on all-listed diagnoses. All differences between estimates noted in the text are statistically significant at the 0.05 level or better.