"US patients with private insurance had a similar life expectancy as their Canadian counterparts, whereas Canadians had a 44% lower death rate than Americans on Medicaid"
Seems like an argument against single-payer being the solution here, considering an American single-payer system would be much more like Medicaid than Medicare. But really all this tells us is that poor people whom qualify for Medicaid die sooner than those in higher socioeconomic statuses. Medicaid is available to them after all. And considering that the relationship between healthcare coverage and life-expectancy is second order to many other variables (diet, risky lifestyle, etc) in general, it is not surprising that it is true for those with CF.
Anyway, a lot of the lower American healthcare results can be explained by lifestyle. Just look at the discrepancies between the Southeast and the Northeastern states in life expectancy, even for people with access to insurance and of the same socioeconomic background.