Here our universal model is Medicare.
All major public hospitals and therefore major health care are State run. Care in these hospitals is free essentially. You pay a levy as part of your tax return dependent on income.
Medicare covers 30- 80% of visits to clinics.
A safety net exists for excess medical expenses where the benefit increases.
Pensioners (elderly and unemployed) receive free healht care as do veterans.
Private health insurance covers care in private hospitals and private emergency departments.
Ambulance care is either a fee for service (in my state) that is offset by an annual membership or pts can take their bill to their insurer. Again pensioners and veterans get free ambulance.
Other sates include an ambulance levy into things like motor registration or utility payments making the service free essentially. Reciprocal rights exist between states for ambulance care.
Universal health care isn't that hard. You just have to eliminate the idea of greed........