Medical models can absolutely get better at recognizing the patterns of diagnosis that doctors have already been diagnosing - which means they will also amplify misdiagnosis that aren't corrected for via cohort average. This is easy to see a large problem with: you end up with a pseudo-eugenics medical system that can't help people who aren't experiencing a "standard" problem.
I'd argue that the current system in the west already exhibits this problem to some extent. Fortunately it's a systemic issue as opposed to a technical one so there's no reason AI necessarily has to make it worse.
Codifying and distilling it removes the points of escape.