That's not true, and it's why clinics are panicking over the new requirement to demonstrate citizenship. The theory was Federal monies were always largely denied to undocumented migrants, but in fact there was significant admixture between state and Federal funding and clinics were reimbursed out of Federal accounts for undocumented migrant care (because California just didn't track who was a citizen and who wasn't).

With that threatened there's a lot of worry here in California, especially about ERs being overrun by undocumented migrants seeking care and claiming it's an emergent issue (because where else can they go?).