Alina Nurieva (right) sat with Gabriela Cisneros, an insurance agent from Sunshine Life and Health Advisors, and picked an insurance plan at the Mall of the Americas in Miami last November. Joe Raedle/Getty Images hide caption

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Mark Bertolini, CEO of Aetna, told the Justice Department in July that the insurer would walk away from many health exchanges if the government opposed the company's proposed deal for Humana. On Tuesday, Aetna followed through. Andrew Harrer/Bloomberg via Getty Images hide caption

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Peter Lee, executive director of Covered California, the state's health insurance exchange, said the projected rate increases for 2017 are linked to increases in the cost of health care in the state. Rich Pedroncelli/AP hide caption

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A guide works on the federal enrollment website as she helps a Delaware resident sign up for coverage under the Affordable Care Act in 2014. Andrew Harrer/Bloomberg via Getty Images hide caption

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President Obama speaks in Dallas in 2013 about the technical problems that affected the initial rollout of the Affordable Care Act. Now, citing the law's success, he is urging Congress to expand the insurance offerings. Brendan Smialowski/AFP/Getty Images hide caption

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Her income as a New Orleans singer fluctuates with the tourist season, says Lisa Lynn Kotnik, and that's made health insurance too expensive in the past. Now that she has a Medicaid card, getting the health care and medicine she needs should be easier. Courtesy of Skip Bolen hide caption

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Louisiana Medicaid Expansion Brings Insurance To Many New Orleans Musicians

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How do you stay on the family health plan without your parents finding out about your health issues? Alex Williamson/Ikon Images/Getty Images hide caption

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A subsidiary of CareFirst BlueCross BlueShield in Virginia won't offer an insurance plan on the lowest tier of the marketplace next year. Morgan McCloy/NPR hide caption

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UnitedHealth Group, based in Minnetonka, Minn., says it expects to lose $650 million on health exchange plans this year. Many people who bought the plans are in relatively poor health, the company says. Mike Bradley/Bloomberg via Getty Images hide caption

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