"good" is a relative term. In health care insurance world, it's the expensive plans, with broad coverage, and the best facilities in network (who participate in research and are at the forefront of treatment - MD Anderson, Mayo, Cleveland, Sloan Kettering etc). You get fast access to the best facilities with the best doctors and best treatments.

Maybe look at the rankings of best treatment facilities globally. Here is the list for oncology. Choose any dropdown you like. You are going to see a lot of "US" at the top.

https://rankings.newsweek.com/worlds-best-specialized-hospit...