With the NHS is the UK I can be pretty confident that no matter what medication my doctor prescribes that when I collect it from the pharmacy it will cost me exactly £8.60
I can also be confident that when I go for an appointment to see my GP that it will cost me nothing. This doesn't mean that is is free, as my National Insurance contributions are substantial, but that I know that I don't bear any financial risk from going to see a doctor.
I can't imagine what it would be like to have to worry about whether going to see a doctor about this mole that's changed a bit might land me with an unknown bill. Or to worry that my daughters peanut allergy could see me paying hundreds of dollars when her adrenaline pens expires.