The current system is a tragedy of the commons. Costs are opaque and distributed. Patients have insurance and may as well buy the most expensive treatment (everybody else is doing it). There is nobody in the entire health system with incentives to trade 1% less benefit for 99% cost reduction.
In Europe, this is often handled by government purchasing discretion (not price caps as many simplistically believe). If X treatment is too expensive, it simply isnt covered. If generics medication get 99% of the job done, that is what you get.
This might mean replacing employee healthcarecare with employee payments, MORE copays, and more transparent pricing (there has already been some improvement in this area).
If a CT cost is 10x at one hospital, and 1x at the other, the patient needs an incentive to seek out the 1X cost. Similar, if one cancer drug is 10k and the other 100k, with a life extension of X days, the patient is the only one that can really make the call.