Agreed - it's pretty unlikely that you'd be able to prove something like that.
I suppose you could try to apply precedents surrounding HIV disclosure, but I think it'd be a tough sell.
Edit: And to be clear, even in that situation, we're talking about disclosure, not actual treatment-related choices.
That's been a pretty common commentary, and I get it, but I think there's room for just about all genres - they've done their fair share of horror-tinged episodes over the years.