Change it to a NHS style system, though with changes in certain things.
The US federal government spends (or spent the last time I worked it out a few years ago) more per capita on healthcare than the UK govt does (or did)
For that the UK gets healthcare free on delivery for all people. The US get some people getting healthcare free at the point of delivery and most people having to pay for private healthcare (let's call it a con job), meaning the US spends a lot, lot more than the UK does.
The US pays for insurance companies to take 15% of all money put into the private system before anyone's even started on the healthcare.
Then you have pharma companies, doctors and hospitals playing the system knowing that because the insurance companies "are paying for it" they can literally charge whatever they want. You're looking at 50% of all money going into private healthcare not going to actual healthcare, but lining people's pockets.