Medicare Part D Exceptions Fact Sheet If you are now enrolled in Medicare Part D, and you find yourself not being able to get medications you need, you can challenge a decision your drug plan makes. The purpose of this fact sheet is to explain when you have a right to challenge a denial by your drug plan, and how to do so. NOTE: YOUR PHARMACY DOES NOT MAKE DECISIONS ABOUT YOUR MEDICATIONS. YOU MUST DEAL WITH YOUR DRUG PLAN WHEN A DRUG IS DENIED.