Best healthcare group.?

how many healthcare groups exist in the US? do they all run the same way? does each state have it's own? which is the best and why?
i'm a registered nurse from singapore.

There are all sorts of health programs, from local, state, government, and major national plans. I cannot give you a straight answer for this question, but I can tell you that the best health plan you can get would be one from your place of work. If you are ineligible for any reason, then finding a plan can be very hard and very expensive.

The only thing I know of that may help would be to check out ehealthinsurance.com. It is just a site that has a compilation of most of the major medical groups in the US. You input your information and criteria for a plan, and it gives you best matches for you. It's not an automatic in, however. You still have to apply for plans you choose, and each plan can reject you, but I find it to be the easiest and quickest way to find out what is out there.