What Is Covered
Each Medicare Prescription Drug Plan has its own list of covered drugs (called a formulary).  Many Medicare drug plans place drugs into different "tiers" on their formularies. Drugs in each tier have a different cost. A drug in a lower tier will generally cost you less than a drug in a higher tier.  In some cases, if your drug is on a higher tier and your prescriber thinks you need that drug instead of a similar drug on a lower tier, you or your prescriber can ask your plan for an exception to get a lower copayment. Find out which plans cover your drugs.