The data turned over to Homeland Security included information about residents of California, Illinois, Washington state and Washington, D.C. The federal departments haven’t announced whether they have located and detained any undocumented immigrants based on that Medicaid data.

Those states, like Colorado, use Medicaid to cover some undocumented people with state money. The federal government covers at least half the cost of Medicaid-funded care to qualifying U.S. citizens through matching funds.