Illegal immigrants worry that their ability to access healthcare […] will become even more risky once President Barack Obama’s healthcare law takes effect. The reform requires all U.S. citizens and permanent residents to obtain health insurance, either through the government-run Medicaid program for the poor or by purchasing private insurance via state exchanges starting in 2014. It also bars undocumented immigrants from participating. As more low-income citizens receive insurance, the fear is that many of the estimated 12 million undocumented immigrants will be easier to identify just because they lack coverage.
http://www.reuters.com/article/2012/08/09/us-usa-healthcare-immigration-idUSBRE8780GP20120809