Decommodify every aspect of healthcare, from the education of doctors to the hospitals themselves. Invest massively in basic medical science research and provide the corresponding advancements and technologies free of charge to the healthcare system.
These treatments cost 100K because of the economic arrangements from which they emerge, not because that’s some inherent (or even sane) price. For a more concrete contrast, Japan has a healthcare system based almost entirely on government set prices for procedures and has better outcomes than the US.