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New England Journal Of Medicine: 10.3 Million Uninsured Covered Under Obamacare

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AP Photo / Susan Walsh

The findings track with previous estimates. They also gain found a significant divergence between states that expanded Medicaid under the law and those that did not. The former group's uninsured rate fell by 6 percentage points among the expansion population; the latter's by 3.1 percentage points.

The study's methodology, which can be read in full here, covered survey data from 420,000 adults from January 2012 to June 2014.