If you wanted to do it cost effectively, yes. I have experience of single player (UK) and private insurance based but properly managed by the government (NL) a

If you wanted to do it cost effectively, yes. I have experience of single player (UK) and private insurance based but properly managed by the government (NL) and can tell you that single player is much cheaper to run. When I moved to NL about 15 years ago the UK was spending the same per capita on the NHS as The Netherlands spent from the central government to cover the shortfall to the insurers. In 2019 there isn't as much difference: a significant amount of providers in the UK have been privatised which increased costs whilst at the same time the NHS budgets have been systemically strangled in real terms - something like annual 2% budget increases against annual 15% cost increases thanks to demographics and lifestyle choices. So in short: single payer is great but the second the Republicans (or whatever the "don't tax the rich" party is at the time) get to touch it they'll ruin it.