I'm in the US and it can actually be quite hard to get some UK folks to understand the cost of medical care here. A relatively informed friend of mine refused to believe you have to pay for birth or for your kids to get treatment.
I'm with a large employer, for me alone I pay $160 a month for insurance with a $1500 in-network deductible. Once I meet that I still need to pay a 20% copay for in-network treatment until I reach $3000 (my out of pocket maximum). Out of network is a $3,000 deductible and $8,000 out of pocket max with 40% copays.
It's not necessarily easy to stay in-network though, especially in an emergency. Also, insurance won't cover the cost of some treatments if you don't try other treatments first.
The other headache is medical billing. They write codes on your notes for everything they use- a single ibuprofen, cotton bud, finger cap etc. You need to scrutinise every single bill and negotiate on them as there are always errors or overinflated costs. Oh, and don't get sick in December with an issue that runs through til January. You'll be paying your deductible twice in many cases.
What irks me the most is that the medical care hardly differs, bar the doctors, nurses and a middle man (insurance company) being richer. It's a 6-week wait to see my doctor right now and they don't even have evening hours.