However the cost of their medical education, while certainly substantial by Cuban standards, is nowhere near that.

I am willing to believe that, but I don't have any way to calculate what the number should be, so I took a generous estimate. (Average US post-medical school debt is $18x,000 according to a quick search I did.)

Cuban education lacks major cost components like practice/internship insurance and U.S. level income healthcare professionals in the teaching: their professors are also paid $30/mo. They also have no top-tier equipment, use run-down facilities, don't stick to expensive regulations and protocols and (if their communism is anything like communism of the place I grew up) most likely employ the students for all kind of maintenance chores. I'd put it at $20k tops for 6 year curriculum, and that's being on very generous side.

Well, working with your assumption, $20,000 loan 10% interest over FIVE years is $424.94 a month.

Somehow I doubt all the Cuba-defenders here are going to accept your assumption, though, as it makes the outrageousness of the whole thing much more explicit.

Yes but that is the difference between a loan system and a welfare system, you're not just paying for the services you received, you're paying for the availability of all services (including ones you didn't use) for all people.