Many of the urgent problems in US healthcare are man-made and economic/organizational, not scientific, in nature.
This is actually one of the areas where I'm pretty optimistic about LLMs (at least if used defensively against, not aggressively by, sprawling bureaucracies).
LLMs can be the email-to-dozens-of-hours-on-the-phone-for-personal-reasons adapter anyone other than billionaires and company execs could only dream of until now.
What it can do is create the best simulation and a model representation and bruteforce on top of that and then take actions, but the model will still be far from perfect and it likely just will help do a bit wiser or optimal decisions, that are like 10 percent efficiency gain here, 20 percent there, etc. And it will take years to see results.