• Cara Orfield, Lauren Hula, Michael Barna, and Sheila Hoag.
• Cara Orfield, Lauren Hula, and Michael Barna are with Mathematica Policy Research, Ann Arbor, MI. Sheila Hoag is with Mathematica Policy Research, Princeton, NJ.
• Am J Public Health. 2015 Nov 1; 105 Suppl 5: S651-7.

ObjectivesWe investigated how access to and continuity of care might be affected by transitions between health insurance coverage sources, including the Marketplace (also called the Exchange), Medicaid, and the Children's Health Insurance Program (CHIP).MethodsFrom January to February 2014 and from August to September 2014, we searched provider directories for networks of primary care physicians and selected pediatric specialists participating in Marketplace, Medicaid, and CHIP in 6 market areas of the United States and calculated the degree to which networks overlapped.ResultsNetworks of physicians in Medicaid and CHIP were nearly identical, meaning transitions between those programs may not result in much physician disruption. This was not the case for Marketplace and Medicaid and CHIP networks.ConclusionsTransitions from the Marketplace to Medicaid or CHIP may result in different degrees of physician disruption for consumers depending on where they live and what type of Marketplace product they purchase.

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