AARP has been a reliable company for people 50 and over for many years. I joined as soon as I could and have never regretted doing so. You have to be a member of AARP in order to get AARP Supplemental Insurance. There are other supplemental companies out there that do a good job i.e. Blue-Cross, Blue-Shield, Humana, and others.
One question you might have is, “What is the difference between MediGap Insurance and Supplemental Insurance?” The answer to that question is: Any Supplemental Insurance that works with Medicare to pay the difference between what Medicare pays (typically 80%) and the remainder of your billing is also called a MediGap Insurance. So they are basically one in the same.