I Agree that Citizenship should be checked at Hospitals
de facto ICE Agents or not... you are preventing FRAUD and ILLEGAL ACTIVITY.
NOW... that being said, I Do not believe that ANY Person, Illegal or otherwise with a life threatening condition should be turned away.
If its an illegal and they have a serious ailment, by all means, Treat the ailment and give them a "Bus pass home"
As for the person "afraid" of getting caught, Don't break the law and you won't have to be afraid.