There are ideas. One of the main concerns is cancer. Let’s just say it: Cancer. It is #1 for costs with cardiac being a close #2. Next to cardiac in cost is long term acute care, then neonatal, then trauma care.
Hospital and physician costs are the primary drivers at 50% of costs in those five. Drugs costs come in third at 10% of total healthcare costs.
Those are the top five issues with the top three cost drivers. None of those are cheap and everyone is susceptible. Answer the question of how to pay for those nationally and the rest becomes trivial.
Collecting money is easy for government. Where it breaks down is in using the money to pay for the services in a way that is efficient and just. We all know government can never be efficient. "Just" is a religious concept, and is therefore completely outside the capacity of the state.