How would this actually be enforced? Unlike other countries with socialized healthcare, the US doesn't negotiate prices with these companies directly. Perhaps there's some mechanism I don't know of, but I doubt it, we're kind of all about empowering capitalists to fuck people over.
The bigger catch is that this would almost certainly go to the supreme court and get overturned.
You're right, but if Trump does medicare for all and orders prices be fixed, all through one executive order, I think the bourgeois would actually kill him.
E: Also he just won't do this lol, it's Trump after all.