Yes, you can buy Medicare Part B (medical insurance) without having to buy Medicare Part A (hospital insurance) as long as you are:
- age 65 or older; and
- a U.S. citizen or a legal resident who has lived in the U.S. for at least five years.
If you would pay the Part A premium and decide to buy Part A, you have to take Part B; you cannot buy Part A alone.
If you get Part A premium free you can choose whether or not to enroll in Part B.