What are the top health insurance companies?

There is really no "top" health insurance company. People like or dislike their insurers depending upon many factors, including the manner in which claims are handled and customer service. They also weigh the amount of choice that they are given in the available physicians that they can use.

In all events, it is critical that you deal only with an insurer that is authorized to transact health insurance in your state. This means that they are licensed by the state insurance regulator and have undergone scrutiny as to its financial condition, staffing, the background of management, and other factors.