I mostly endorse single payer, just don't think Medicare for all is the best iteration - though I concede it might be the most realistic political option at the moment. I personally would have extensive coverage for those under 18 and would drop Medicare to 55. In between (18-55) I would have state supplied catastrophic coverage, along with coverage for routine physical examinations and screenings. I would also have sate supplied maternity care from conception to 3 months after birth. For those that develop chronic diseases/conditions, I would have a public option for continuing care (to also cover disabled, mental illness, etc) that would probably be similar to Medicaid. I would anticipate the majority of these services would be provided via a single payer scheme (speciality clinics for check ups/screenings, maternity, etc). Beyond that, I would have the option for private plus up, in order to either receive higher level of care for basic items covered above, or for providing true cost insurance for unexpected costs that would otherwise come out of pocket. There could be a public option for this coverage as well.