There might be some edge cases where you can negotiate, but it’s usually more trouble than just paying it.
Not a burger so not sure how well this works but supposedly you shouldn't just pay the bill, you should treat it like a business negotiation. This is pretty alien to me but considering how much US healthcare costs, perhaps it's worth it.
https://www.npr.org/2023/03/24/1165953653/medical-bills-debt-negotiation-forgiveness
Discussion
Fair enough, it does sound weird but I've seen it mentioned a bunch of times and thought it might be worth it if it's straining your finances.