just a reminder:
Not all visitors medical insurance covers pre-existing conditions. You need
to make sure that before buying it. Since most parents don't have ssn and
medical history here, so when you claim, it might be more complicated for
pre-existing illness.
also check the Medicaid. Different state has different rules and
qualifications. I heard visitors in NY/CA got Medicaid before. News like
this indicates that foreigners can get Medicaid here with visitor visa. But
it is on your own risk: