> How would it work in terms of replacing Medicare and covering high-ticket medical procedures?

Medicare is an insurance system. In principle if you gave the average person the equivalent amount of money it should be enough to buy health insurance with.

If that isn't true in practice it's a failure of healthcare/insurance laws rather than the UBI.

> In principle if you gave the average person the equivalent amount of money it should be enough to buy health insurance with.

So the working scenario is UBI followed by health insurance mandate? What happens if the remainder is $0, or worse, healthcare prices (and consequently health insurance prices) outpace UBI growth?

> So the working scenario is UBI followed by health insurance mandate?

Don't we already have a health insurance mandate?

> What happens if the remainder is $0, or worse, healthcare prices (and consequently health insurance prices) outpace UBI growth?

Presumably the same thing that happens if healthcare prices outpace the Medicare budget.

>Don't we already have a health insurance mandate?

Not anymore, Congress voted to remove it

It wouldn't.

Health care is a good litmus test for UBI in the US. There's reasonably broad support for access/universal coverage but no will to pay for it (people in office are probably more opposed to it than voters).