The Sanders campaign and David Himmelstein and Steffie Woolhandler reacted with sharp criticisms to our recent report, The Sanders Single-Payer Health Care Plan: The Effect on National Health Expenditures and Federal and Private Spending. In this brief, we discuss our key assumptions in these areas of disagreement and highlight ways in which we may have actually underestimated overall costs of the Sanders proposal. By and large our assumptions are laid out thoroughly in the original paper, but here we use them to address the specific statements made by the campaign.