Consult a lawyer. Participating locations only. etc. etc.
Funny story (that I didn't include in the blog) is that I actually wound up in a psychiatric facility for a second time after I was in-and-out of Brigham and Women's on 3 separate occasions. I was in a much better state mentally and physically, and this particular facility (McLean Hospital) was way better than the first one I was in. The circumstances were different and I was happy to be there because things were still very rocky at home. And very dark. So my wife and I felt it better that I be in an in-patient facility at this point, which came right before my official anti-NMDA receptor encephalitis diagnosis.
Anyway, the funny story is that I showed up to McLean, after being transferred from Brigham and Women's, with a physical copy of my wife's PoA over me and a health care proxy. The charge nurse said it was the first time he had ever seen anything like that before.