For acute emergencies, like a heart attack or car accident, US hospitals are obligated to treat your immediate needs if you enter the lobby.

You just clutch your chest and say, "Help, I think I'm having a heart attack!"

Sadly, cancer doesn't qualify. Either you pony up $50,000 - $200,000 in the hospital lobby, or they call a security guard and escort you out of the building. Then you go home and die.