Waiting too long to enroll, plus other what-if questions on Medicare

A reader inquires: What if I did not enroll in a Medicare Part D plan when I turned 65 and I am taking an expensive medication? When can I enroll in Part D? Original article: https://www.reviewjournal.com/livewell/waiting-too-long-to-enroll-plus-other-what-if-questions-on-medicare-2896955/