I can understand Dr. Lang revealing a general condition to Vicki and Barnabas about each other, but it seemed that he was getting pretty specific when talking to her, as well as questioning her about him. Should he really be revealing that much about another patient?
No he should not. But even worse was Dr. Dave Woodard, who blabbed specifics about Maggie's condition to everyone in Collinsport who would listen, not just Julia or The Sheriff. He surely would've had the State Medical Board come down and reprimand him had they known.
Lang, on the otherhand, is just a fruitcake.
But then again, we're in DS-Land, so ethics don't always apply.