Sorry for the wait. Ok so these are going to be tumblr blogs, I tend to find the best originals there.
Okay, so I’m gonna start with general recs. My all time favorite blog is this one https://ashintheairlikesnow.tumblr.com/post/623908755816497152/masterlists-masterpost
She writes medical stuff occasionally, especially when she's writing about boxboy stuff. The box boy/babe universe is a sort of whumplr thing based on the concept of like people being sold as slaves and there's a lot of worldbuilding invovled, but the exact canon will vary between blogs.
This person also writes BBU whump, with slightly mixed quality. https://haro-whumps.tumblr.com/post/189851461413/box-boy-masterlist
One of the most popular whump blogs on tumblr is https://whump-tr0pes.tumblr.com/
Honor bound is like a must read.
Whumpiary is good too, really like what I’ve read of it, very interesting plot. https://docs.google.com/spreadsheets/d/1E786ebVvP-f4teX-dLK_evgXlaX0WrCzct70ThZsmFQ/edit#gid=1955837640
Also, this post here has a ton of whump creators tagged, and most of them are pretty good: https://caddy-whump-us.tumblr.com/post/650555624934014976/sideblogformindtrash-milk-carton-whump
Now, more specific fic recs for hospital stuff specifically:
This orchidscript one is pretty good. Orchidscript tends to have a good variety of postshttps://orchidscript.tumblr.com/post/664392708220125185/7-dum-spiro-spero
Wildfaewhump does a lot of inhuman medical torture stuff that I personally like a lot, especially the like, more gooey, comfort stuff https://docs.google.com/document/d/1mH80y_0ByM82UEOXnWEPSqv1cPW4FFNl0x_e_75_rcg/edit
I liked this one, but the writing style is eh https://evermetnotforgotten.tumblr.com/post/663634323532103680/i-will-be-doing-my-obligatory
This is a very good, non-torture focused piece https://ashintheairlikesnow.tumblr.com/post/633341417737027585/whumptober-day-29-emergency-room
And this is another good one, although it’s slightly more intentionalhttps://ashintheairlikesnow.tumblr.com/post/190446993447/welcome-to-surgery-kauri
I found a really good blog a while back with an original universe set in a 1950’s asylum, but for some reason I can’t find it. If I find it, I will definitely link it. If I think of anything else, I’ll link it. If you want something else or more specific, I can go looking for it also.