How Can I Compare Medicare Part D Plans? 
I believe Medicare.gov is the most efficient way to compare plans . BTW - you should compare your plan every year during the Annual Enrollment Period , as plan 's formularies change and your medication may have changed - so always shop every year during the Annual Enrollment Period . Oct 15th - Dec 7th . -LRB- Plan will be effective Jan 1 of the following year -RRB- It may turn out - you are on the least out of pocket cost plan for you for the coming year as well - but better to always check . If you are on a Supplement and a RX plan - you compare the RX plans , if you are on a Medicare Advantage plan you compare the Advantage plans . -LRB- Because your RX is included within each Medicare Advantage plan - typically -RRB- . Hope that clarifies ! 