The estimate includes a projected net cost of $518 billion over 10 years for the proposed expansions in insurance coverage. That net cost itself reflects a gross total of $829 billion in credits and subsidies provided through the exchanges, increased net outlays for Medicaid and the Children’s Health Insurance Program (CHIP), and tax credits for small employers; those costs are partly offset by $201 billion in revenues from the excise tax on high-premium insurance plans and $110 billion in net savings from other sources. The net cost of the coverage expansions would be more than offset by the combination of...