In the UK, some people choose to go to an NHS hospital voluntarily (if mental health services agree they need to), or involuntarily under the Mental Health Act (known as being "sectioned"), or can access a private mental health hospital if they pay for it. NHS mental health hospitals are funded by national insurance. How does this system work/fund itself for Americans who are admitted to hospital against their will, and are they somehow charged for this? Thanks!
Edit to add: Thanks everyone for informative answers about various scenarios, I've wondered this for a long time!