Yup, twice. I receive a Pell Grant for college.
I was also on state medical care in Minnesota for about 2 months. I wouldn't have signed up for it at my age and health status, but I got injured at a very bad time between jobs and while moving, and it was either something very serious, or something not so serious. Risking it could have had major consequences. So I signed up for state insurance and got off it as soon as it was confirmed to not be serious.
In Minnesota, state insurance works 3 months retroactively. So, I was able to go the ER immediately and have that bill covered.