Are you currently choosing not to enroll in Medicare Part B?
Yes, I  wanted to do so at a later point of time.
In this case your coverage may be delayed and you may have to pay a higher monthly premium for as long as you have Part B. Your monthly premium will go up 10 percent for each 12-month period you were eligible for Part B, but didn't sign up for it, unless you qualify for a "Special Enrollment Period".
Interesting, I didn't know that. Oh, and what is this "Special Enrollment Period" you mentioned?