The biggest area of improvement in health care is at the cheaper end. Many people die annually from being unable to afford the $2.50 it costs for malaria treatment, or life saving vaccines.
The side dish problem is vaccines are insanely profitable; every dollar spent in the US on vaccines supposedly saves fifteen bucks of health care expense. I've seen numbers as low as $10 and as high as $15000. The problem is some very populous political and economic regimes worldwide are so unstable that even 1500% rate of return investments, which would seem a no brainer to fund in the west, are impossible without massive external western involvement. In a system that dysfunctional, malaria might not be the biggest problem, nor incredibly expensive and short lived apple iHealth devices. We've tried allowing infinite immigration from failed states into western states; that didn't help either. Just brain drain's the failed states while exploding welfare expenses in the western states.