We can discuss ways to drive down costs in healthcare, but most of the cost problem comes from the fact that a large percentage of healthcare costs are labor.  Labor is something that is very difficult to outsource and labor in healthcare is highly specialized, requires significant education and all of that means that to get people to become doctors, nurses, PhD's developing drugs, etc. you have to pay them a lot of money, otherwise they will become lawyers, financial analysts, engineers or other high paying professional job. 

Your example of Argentina has a per capita GDP of $7.5k.  If we are to assume that doctors are paid similarly in relative terms in the two countries, the difference in costs can be almost entirely attributed to the doctors pay rate. In the US if you lower doctors pay you'll get fewer doctors but costs will be lower (lower cost and quantity of healthcare available).  If you raise doctor pay you'll get more doctors but higher costs (higher costs and more total healthcare available).  It's sort of works like inverse economies of scale. 

If you want to argue more about how to drive down costs I'd be happy to do that if you're willing to answer the question I just posed to KV.