If you work you purchase insurance, there are numerous plans, or if you don't work you still qualify for government plans (before the silly healtrabroadill passed) like Cobra that can cover you. You still pay a premium (but you guys do to and a high tax) and you pay a percentage of your treatment.
Many who don't work, don't bother to signup for any plans or bother to signup for government assistance still get treated when they show up at an ER. No one is ever turned away and everyone recieves treatment in the order they arrived.
Our system is under great strain now because we have millions and millions of aliens in our country using it and not paying and huge portion of citizens here don't work and don't bother to get any type of insurance on anything.