A Medicare Advantage HMO plan is an alternative plan to traditional Medicare. It outlines a specific list of doctors, hospitals and other providers that members must use in order to receive coverage for benefits.
There are other benefits to having HMO versus traditional Medicare. This includes coverage for deductibles, large reductions in coinsurance at the doctors, prescription plans, as well as wellness and fitness programs.
Selecting a Medicare Advantage would be considered an alternative to your Medicare coverage. You do have the option to revert back to Original Medicare at anytime.