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J Public Econ. 2012 Dec 1;96(11-12):909-929. Epub 2012 Aug 16.

The Impact of Health Care Reform on Hospital and Preventive Care: Evidence from Massachusetts(☆).

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  • 1The Wharton School, University of Pennsylvania and NBER.


In April 2006, Massachusetts passed legislation aimed at achieving near-universal health insurance coverage. The key features of this legislation were a model for national health reform, passed in March 2010. The reform gives us a novel opportunity to examine the impact of expansion to near-universal coverage state-wide. Among hospital discharges in Massachusetts, we find that the reform decreased uninsurance by 36% relative to its initial level and to other states. Reform affected utilization by decreasing length of stay, the number of inpatient admissions originating from the emergency room, and preventable admissions. At the same time, hospital cost growth did not increase.

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