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 formularies is put into a cost group called tiers. For the lowest tier, you pay the lowest copayment. As you take a step up to the next tier, what you pay increases.

What is the Coverage Gap?

What is the Part D Late Enrollment Penalty?