The total volume of outpatient ED visits reached 2.4 million in Massachusetts in FY 2010, which was almost three times more than the total number of inpatient discharges. The preventable/avoidable ED visits accounted for 49 percent of the total ED volume, where non-emergent visits accounted for 23 percent, emergency but primary care treatable visits accounted for 21 percent, and emergency but preventable visits accounted for 6 percent.
Efficiency of Emergency Department Utilization in Massachusetts (PDF) 
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- Appendix A. Data and Methodology (PDF)
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