How To Enroll In Medicare Part A Online? 
You can enroll in Medicare Part A -LRB- and Part B as well -RRB- online through the social security administration website , ssa.gov . Part A & Part B are referred to as Original Medicare . Original Medicare covers approximately 80 % of expenses and both parts feature a deductible that you 're resopnsible for paying -LRB- in addition to the other 20 % of remaining expenses -RRB- . I would recommend adding a Medicare supplement -LRB- Medigap -RRB- plan to cover the other expenses - these are sold through private insurance companies . Plan F is the most comprehensive , but if your doctor accepts Medicare and assignment , you may want to look at a plan N as well . The major advantage of adding a Medigap plan when you sign up for Medicare Part B is that you have a 6-month open enrollment period where you ca n't be turned down for a plan -LRB- no medical underwriting -RRB- and it helps create a predictable expense structure for your health care . 