Kat.
Just read all the postings and there is so much that has been offered, discussed and so on I don't think I can contribute much more. My thoughts at this point are:
1) Were you asked for credentials?
2) Are you a volunteer?
3) How long have you been playing your instrument?
4) Did you want to get paid?
5) Have you played in hospital setting before?

Sounds like I'm asking for credentials. Well, maybe I am in a way. I don't know you. You sound very conscientious, concerned and all the other pretty adjectives that can be said. But you are offering to go into an area that is highly regulated. Maybe that is not a good word to use. But I think you all know what I mean.
I was responsible in providing entertainment for a 1600 bed psychiatric hospital for 25 years. Stories!!!! I could write a book. After 35 years in total, I retired 5 years ago. I still go to the old folks home and play music.
Please Kat, understand what I'm trying to say. Your intentions are great, but can you play?? How long have you been performing? Are you a musician that is called up from the audience to play 2 or 3 songs? Get a great response then go home with a happy smile on your face. Then have a hard time sleeping because you were so great?
Mean while the folks on their way home are talking about the dud that was trying to play/sing? We had to clap hands though. It was the thing to do.
I'm not wanting to be negative, but trying to be sure of who you are and are you prepared for what you want to do.
Beer