Data Matters provides accurate, trusted Illinois-specific data on healthcare delivery, Medicaid, the ACA and the uninsured. We believe that consulting the data, and making it available in accessible and meaningful formats is essential to understanding existing and proposed public policy at the state and federal level.


Medicaid beneficiries represent about a quarter of Illinois’ residents, more than 3 million residents. Close to half of those covered are children. The state’s Medicaid expansion was by far the largest driver of increased health insurance coverage since the launch of the Affordable Care Act in late 2013, with a doubling of working-age adults covered by the program. Medicaid data »

Illinois Medicaid

ACA and the Uninsured

The Affordable Care Act is the most sweeping change to the healthcare landscape since the enactment of Medicare and Medicaid half a century earlier. In the space of five years, the number of Illinois residents living without health insurance has been cut in half. The decline has not been even across the state, however, and more than 800,000 remained uninsured in 2018.   Data on the ACA and the uninsured »

Coverage levels