A giant problem with getting healthcare through insurance companies is that it's not actually insurance. Insurance should only be used to pay out in catastrophic cases; it's always cheaper to pay for something predictable yourself than to make an insurance claim.
Of course, most people can't afford any healthcare at all. There's no way to insure that.
Total cost is $2800 per person per year.
In the US it would cost $950b to provide that for everyone.
The US currently spends $1077b on Medicare/Medicaid.