The number of persons without health insurance coverage in the United States is one of the primary concerns raised by advocates of health care reform. A person without health insurance is commonly termed uninsured (regardless of insurance of objects unrelated to health), and this article uses the term in this sense as well.
Multiple surveys indicate the number of uninsured has fallen due to expanded Medicaid eligibility and health insurance exchanges established due to the Patient Protection and Affordable Care Act, also known as PPACA or "Obamacare". These changes took effect January 1, 2014. The Commonwealth Fund reported in July 2014 that an additional 9.5 million people aged 19-64 had obtained health insurance, roughly 5% of the working-aged population. Gallup reported in July 2014 that the uninsured rate among adults 18 and over fell from 18.0% in Q3 2013 to 13.4% by Q2 2014. Rand Corporation had similar findings.
According to the United States Census Bureau, in 2012 there were 48.0 million people in the US (15.4% of the population) who
were without health insurance