Can I Buy Into Medicare? 
If you are a US citizen or have been a legal resident of the United States for over 5 years , but have not paid enough Medicare taxes to receive free Medicare Part ! , you can pay a premium to buy into Medicare . You can pay the same premium for Part B as everyone else , and take it as a stand alone plan . Or you can pay a premium for Part A . If you purchase Part A , you must also purchase Part B. Call Social Security at 1-800-772-1213 to see what your premiums would be to purchase Medicare Part A and/or B. 