U.S. Senator Mark Kirk says the state is often late reimbursing doctors for Medicaid.
And that could lead to more doctors refusing to see those patients altogether.
KIRK: I think for most people it doesn’t really matter if a politician Springfield tells them they have health insurance. The question is, is their family actually going to be covered?
A spokesman for the Illinois Comptroller says the state has more than 600 million dollars in Medicaid bills dating back to January.
Meantime - Republican Bruce Rauner hopes to unseat Governor Pat Quinn in November.
Rauner says the state will be on the hook for some big payments down the road.
RAUNER: We are going to have a huge budget hole once the federal government steps back its funding of Medicaid, which is going to happen.
A spokesman for the state Department of Healthcare and Family Services says if the matching federal funds drop below 90 percent - the health care expansion is rolled back.