get sick, johns hopkins is a great place to go to get treated. if the state of maryland can cap what hospitals can charge, why can't every state do this? >> reporter: it's interesting, john. back in the '70s and '80s, various states tried it and you know what, they went right back to the old system. and i'll bet you can guess why. hospitals don't make as much money when you do what maryland is doing. the hospitals said, forget it. >> new jersey hospitals that you showed us, do they get paid all of the extra charges they ask for? >> reporter: they don't. they don't usually make the full markup. they negotiate a price lower than that, but still significantly higher than what they get in maryland. what do hospitals in new jersey and elsewhere get? we don't know because the negotiations between insurance companies and hospitals are kept secret. >> when you get your bill, you