How does Medicare Part D coverage work?

Each Medicare Advantage plan with prescription drug coverage or Part D plan has its own list of covered drugs, called a formulary. Our pharmacy department and doctors decide which drugs to include based on quality, safety, and how well they work.

Every drug listed in our formulary is put into a cost group called a tier. For the lowest tier, you pay the lowest copayment. As you move to the next tier, what you pay increases.

What is the coverage gap?

What is the Part D late enrollment penalty?