You must have worked 10 years under Medicare Covered Employment by the time you are 65 to receive free Medicare Part B.
If you are not eligible for free Medicare Part B, you can purchase it along with Medicare Part A during the general enrollment period or the special enrollment period.
The general enrollment period is every year January 1st to March 31.
The special enrollment period can occur for a number of different reasons. If you or your spouse continue to work and receive health insurance coverage from an employer, your Special Enrollment Period continues indefinitely. If you lose your job or your health coverage with that job, you have a Special Enrollment Period for 8 months. There are other exceptions, so check with your local Social Security office if you have questions.
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1 If you are living in Puerto Rico, you will be automatically enrolled in Medicare Part A (if you are receiving Social Security or RRB benefits), but not Part B. You must manually sign up for Medicare Part B.