What if the deducted amount is greater than my monthly social security payment?
In that case you'll get a separate bill from another federal agency, such as the Centers for Medicare & Medicaid Services or the Railroad Retirement Board.
I also have a concern about whether you decide not to enroll in Medicare Part B at first but then decide to do so. When can I submit my application?
You should sign up for Medicare three months before reaching age 65 , even if you are not ready to start receiving retirement benefits .