Where Do I Sign Up For Medicare? 
You can sign up for Medicare online at medicare.gov . If you are nearing age 65 , you can sign up in the three months before or after the month of your 65th birthday . If you would rather sign up by phone , you can call 1-800-MEDICARE -LRB- 1-800-633-4227 -RRB- . Or you can go to your local Social Security Office to sign up for Medicare . 