In the UK most hospitals charge visitors and patients for parking. This can be tricky if you are visiting the hospital unexpectedly, as you may not have suitable change to feed the machines.
Earlier in the week we visited a hospital in Vallejo and the parking free, as seems to be the norm among hospitals in California. Moreover, during office hours they offered a valet parking service, so you could stop at convenient place, get out of the car and your car would then be taken to the parking garage (Multi-storey car park) for you.
We just parked ourselves and then took advantage of the hospital’s clever scheme to encourage exercise as we walked the seemingly endless corridors to where my mother-in-law was staying.