If you want to enroll in Medicare Part B, you can do so when you first become eligible for Medicare via the Social Security Administration (SSA) website. This is the quickest sign-up option.
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Medicare Sign Up Forms

If you did not sign up for Medicare during your Initial Enrollment Period, then that means you should be coming in to ...
If you aren’t automatically enrolled in Original Medicare, you will need to manually enroll. The sign-up process starts 3 months before the month you turn 65 and lasts until 3 months after your ...
Your initial window to enroll in Medicare starts three months before the month of your 65th birthday and ends three months ...
Medicare Part B is medical insurance. Original Medicare forms when combining Part A (hospital insurance) and Part B. People often enroll in Part A and Part B together when they first become eligible ...