Exactly. I don't think it's because the medical board itself would stop them, but more because the stigma attached to it would lead to people questioning them and their ability to do their job, not to mention the issues with insurance. I'd say that likely has a lot more to do with doctors wanting to see others off-the-record... I know of some teachers who do the same thing with psychiatrists, because they don't want it getting out to the students' parents.