When Can You Get Medicare B? 
You can get Part B when you qualify for Medicare at age 65 or are on Social Security Disability for two years . If you opt out of Part B when you first qualified due to being covered under a group plan , then you can enroll in Part B when your group benefits terminate . If you did not sign up during your initial enrollment period or special enrollment period , then you may sign up during the General Enrollment Period Jan 1st through March 31 each year . 