This just in from Krugman:

The budget office says that all this would cost $597 billion over the next decade. But that doesn't include the cost of insuring the poor and near-poor, whom HELP suggests covering via an expansion of Medicaid (which is outside the committee's jurisdiction). Add in the cost of this expansion, and we're probably looking at between $1 trillion and $1.3 trillion.

There are a number of ways to look at this number, but maybe the best is to point out that it's less than 4 percent of the $33 trillion the U.S. government predicts we'll spend on health care over the next decade. And that in turn means that much of the expense can be offset with straightforward cost-saving measures, like ending Medicare overpayments to private health insurers and reining in spending on medical procedures with no demonstrated health benefits.