Now that the Affordable Care Act has relaxed the eligibility requirements to qualify for Medicaid, so many people are coming to take advantage of it that states are now getting worried.

The Associated Press reports Washington, D.C. and 31 states have expanded Medicaid, meaning lots more low-income people now have coverage than before the ACA's passage. Currently, the federal government is footing the bill, but in January, states will have to fork over 5 percent of enrollees' cost, with that scheduled to rise to 10 percent by 2020.

And at least some of the states aren't happy about it. Arkansas, Kentucky and Ohio in particular are trying to get Medicaid recipients to pay more toward their coverage, which experts say could drive tens of thousands of them off the insured rolls altogether. While many people think of Medicaid as free, it really isn't, since lots of states require patients to fork over copayments.