Does Medicare Advantage Replace Original Medicare? 
When you take out a Medicare Advantage Plan you do not lose your rights and protections under Medicare . You are still in the Medicare system . The difference is that instead of Medicare acting as the insurer and paying the claims , that responsibility has been given to the private insurance company . Medicare pays the insurance company for each individual they enroll to manage the claims . So from the standpoint of replacing Medicare , as far as claim processing and administration the answer would be yes . 