Medicare for all

1. Allow anyone to buy into Medicare at cost by that age group.
2. Give anyone that's covered by health insurance (private or public) a refundable tax credit corresponding to the cost for Medicare (point 1).
However, private insurance must follow some simple rules:
a. no pre-existing conditions
b. no price differentiation (same price for everybody by age).
c. use Medicare codes (simplify billing and comparisons).

I don't really know what the total net cost (federal gov.) would be, but I'm guessing at about $500Billion/year. It's less than perceived at first sight since health-care benefits from corporations would be taxable, and thus provide more revenue. Also Medicaid would basically disappear since they would now be covered by Medicare.

Anyone that's already covered by private insurance would keep the same insurance. The refundable tax-credit would more than compensate for making the health-care benefit taxable. I'm guessing that the refundable tax-credit (for an individual) would range from $250/month for a 20 year old to $700 per month for a 64 year old.