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Disentangling the ACA’s Coverage Effects — Lessons for Policymakers

  • Molly Frean, B.A.,
  • Jonathan Gruber, Ph.D.,
  • and Benjamin D. Sommers, M.D., Ph.D.

In 2014, the biggest factor in the expansion of U.S. health care coverage under the Affordable Care Act was Medicaid, which produced 63% of gains — but this effect comprised several distinct phenomena.

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Funding and Disclosures

Disclosure forms provided by the authors are available at NEJM.org.

This article was published on September 21, 2016, at NEJM.org.

Author Affiliations

From the Department of Health Policy and Management, Harvard T.H. Chan School of Public Health, Boston (M.F., B.D.S.), and the Department of Economics, Massachusetts Institute of Technology, Cambridge (J.G.) — both in Massachusetts.

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