What Does Medicare Part D Pay For? 
Medicare Part D is your prescription drug plan . It is administered by private insurance companies under the supervision of CMS -LRB- Medicare -RRB- . Medicare sets minimum requirements that all insurance companies must follow . The companies determine which drugs they will include in their Formulary of drugs that they will cover . When you select a prescription drug plan make sure that all of your drugs are covered . Even if you have to pay a little higher premium , the cost of certain drugs can often be far greater than the additional premium to have that drug covered . 