What insurance company provides the best supplimental coverage for the 65 and over person?

I need to obtain Supplemental medical insurance as I am approaching age 65. What is the least problematic way to get necessary information on coverage without dealing with an agent of the companies. What questions should I be asking and how do I do a cost comparisence. It , so far, sounds like I will be paying the same amount for all the necessary coverage, that I am paying now. Please give me some questions to ask or how to make this easier !