Much like what Rite80 stated- it is all relative. We have a much larger pool of contributors to draw from. The problem with our  system is the fact we have too many insurance companies, pharmaceutical companies, over-paid doctors, and people who do not take care of their health (let's just say it-obese) that dilute our systems efficiencies all of which contribute to overpricing.
Until we can put some sort of restrictions on these costs-we'll never be where these other countries are at.