While the cost of a National Universal Health Care policy would seem extraordinary high, isn't the cost being paid now through both private and public insurance programs, unpaid "charity" write-offs, and other ways that benefit the very rich (who can afford it) and the very poor (who pay nothing) with the Middle Class (as a percentage of their earnings) bearing the brunt of any medical calamity (because of taxes, insurance costs, and co-pays/deductibles that run into the thousands of dollars)? 
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National Universal Health Care should be more cost effective because it simply eliminates the entire Health Insurance Company Middle Man. The Government contracts with hospitals and doctors. They bill The Government. Everyone gets treated. Everyone gets paid. And the Private For-Profit Insurance Industry simply ceases to exist.
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And paying for it is simple: The poor pay zilch. But taxes on businesses and the very rich go up to off-set their "windfall" for not having to buy medical insurance.