There is nothing incompatible between democracyb and communism for that matter - in fact a viable communist society cannot exist and flourish in the absence of democracy, as has been demonstrated over the past couple of generations.

Capitalism, on the other hand can manage pretty well in totalitarian societies, as is being demonstrated currently in China. Rather better than it can in countries that are democratic (though perhaps "democratish" might be a better word for the word for countries where a majority of voters can be frustrated by a powerful and wealthy minority).

We shouldn't allow ourselves to be fooled by labels.
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But this is drifting away from the issue of health care reform - a more immediate issue which does not have to wait upon reshaping the financial and social system within the United States.

Capitalist societies, socialist societies, communist societies, democratic societies, authotarian societies, totalitarian societies - all of these around the world in one way or another have been able to manage to organise things so that reasonable health care is available to all. The only exception among wealthy or moderately wealthy countries is the United States.