Everything You Need to Know About Medicare Everything You Need to Know About Medicare More than 61 million Americans use Medicare, and it's likely most of them were confused when they first encountered this complex program. In January, I became one of the millions of Americans enrolled in Medicare. The process of joining the 61 million Americans now enrolled in our national health insurance system for seniors and folks with certain disabilities or conditions wasn’t the hardest thing I’ve ever done, but it was no walk in the park, either. The Medicare system, including options like Medicare Advantage plans and Medigap policies, has lots of moving parts.