Why enroll for Medicare during the Initial Enrollment Period?

It's important to enroll for Medicare during the Initial Enrollment Period. If when you are first eligible you don’t enroll in Part B or Part D (which are optional and, unlike Part A, involve monthly premiums), and you don’t qualify for an exemption or special enrollment period, you could be charged higher premiums and a late enrollment penalty. Not only that, you might be limited by the times of year in which you can enroll.