When I saw Bill's tweet I actually wondered if Dan was OK with him releasing his condition. This is a HIPAA violation by my accounts, I could be wrong. And knowing Dan and Bill, I'm sure that Dan was OK with it, but this didn't seem to be Ken's issue with it.
In defense of Ken... puke... What if Dan didn't want that released, maybe they thought it was a stroke but were still running tests.
I think HIPAA would only be relevant if it were Dan's employer or doctor who said something. Now how BF found out is beyond me