Corporations, now. Can’t even really call it a practice. They are businesses that employ doctors. In law, most civilized places, you can’t own stake in a law firm unless you are a member of the bar. Makes for a more service focuses industry.

Another thing I haven’t seen mentioned is the way people find doctors now has changed. People look online, and there are plenty of sites that are just aggregators for data about doctors. Anyone can scrape that info and then setup a webpage to rate doctors. So now doctors are finding that they aren’t getting patients if they aren’t getting good ratings, so now we have doctors just telling patients what they want to hear, prescribing what they want to be prescribed. Gotta keep up that 9.8/10 rating to keep patients coming in.