No. If you get something like cancer, at best you can expect Medicaid to be comparable to basic private health insurance, which can easily leave people with out of pocket costs they can't possibly afford.

Medicaid has a ton of other problems starting with eligibility, but even if you are eligible and you successfully jump through all the hoops to keep it (which are sometimes totally insane: https://youtube.com/watch?v=bVIsnOfNfCo), you still may not be able to get the services you need. Many doctors won't accept it and you can die just waiting for an appointment. Studies have shown there was effectively one psychiatrist for every 8,834 Medicaid beneficiaries and just one cardiologist for every 4,543 Medicaid beneficiaries. These doctors can't possibly see, let alone adequately treat and manage the care of, everyone who needs them.

The closest we get to free healthcare in the US is care in the emergency room which is only required to "stabilize" you. They'll try their best to keep you alive if you're actively dying, but then they push you out the door and send you a massive bill. They won't give you chemo or radiation to keep your cancer from spreading