The US already has the best medical system in the world. 89% have health care insurance. All that is needed is to connect the poor portion of the 11% not covered to the medical system. 

And it is only a maximum of 11% of the population which needs help to connect to the medical system. That can be done with insurance or with cash - a Guaranteed Annual Income for the poor. The advantage of the GAI is that it would solve  another problem, namely the welfare system. The poor would have money for all their needs, not just health care. Rather silly isn't it to fund just one part of lives? 

The US could be a world leader.