Governor Pat Quinn has signed into law a bill that will expand Medicaid coverage to about 342,000 low income adults in Illinois.
The law provides subsidized health coverage for Illinois residents who earn up to about $15,860 for an individual, or $32,500 for a family of four.
It takes effect next January.
The federal government is expected to contribute more than $12 billion toward expanded Medicaid coverage in Illinois from next year through 2020.
Illinois is one of 23 states plus the District of Columbia that are moving forward with Medicaid expansion. It is one of the components of the Affordable Care Act. The program is optional. 21 other states have opted out of it.