Even in single payer systems, bankruptcy is often the result of medical issues. You have to remember that many conditions prevent you from working, so even if your medical bills are paid, you still can't afford your daily expense.
Interestingly, it turns out that research commissioned by the Canadian government shows that 15% of people over the age of 55 who declare bankruptcy cite a medical problem as the primary reason. Medical bankruptcies can, as I've been saying for a while, be driven by something other than the lack of free government provided medical care.
True but irrelevant, since there is a huge difference between being bankrupted by the medical system itself, and bankrupted because you can't afford not to work (which can happen for many other reasons and is a separate problem to guard oneself against).
I don't think it's irrelevant at all. People throw out the statistic that X% of Americans go bankrupt because of medical problems inferring it's because we don't have single-payer healthcare.
The statistic about Canada backs up the idea that isn't true.
Compare that with the number of healthcare related bankruptcies in say, the UK.