President Obama's executive order preventing the deportation of up to 5 million undocumented immigrants won't preclude all of them from getting affordable health coverage. But it remains to be seen just how many will be presented with that option.

Even if a good amount do get insurance, the health, social and economic costs from having the remaining immigrants effectively locked out of health coverage will remain a problem, say advocates and analysts. And some of those costsincluding visits to emergency rooms that aren't paid by insurancecould end up getting passed along to the general public, they noted.