Oh, and before I forget to inform you, there is a massive amount of U.S. citizens commiting Medicaid fraud - see it all the time. The persons have employer-based insurance and lie to the state to qualify for medical assistance so they do not have to pay their share of co-insurance (usually 10-20 % of total medical costs after the insurance adjusts for contracted rates). This is the first fraud.
The second is that most aren't married, but live with their significant other or parents, etc. So they lie about their total income and household expenses to avoid responsibility for their medical care costs. It is the ones who are citizens who know how to game the system because they have full access and qualify for all sorts of programs, not the undocumented. So they lie about the total household members to the local DSHS office, and on and on it goes.
If the government doesn't demand accurate proof of income and wages (which can be easily obtained by just bringing in a copy of your W2 form or a couple of payroll deposits or paychecks) and the citizens are ok with this, who are we to say someting, right? But these anti-immigrant "Einsteins" can be easily debunked about their lies regarding healthcare and the undocumented.