Why do the premiums on Part D plans vary so much?

Updated on: October 26, 2018

Originally posted on: August 1, 2014

There are many factors that affect a plan’s premium. It could be the number of drugs that are covered, the number of restrictions placed on those drugs, the deductible amount (if any) and the copayment or coinsurance amount that you will need to pay. Plan’s that offer low premiums are more likely to include less drugs on their formulary – known as a “skinny formulary” – or you may pay more for drugs because they are placed on a higher tier. When determining the cost of a plan you should consider all your costs including the premium, deductible and copayments/coinsurance for your medications. Learn more about Medicare Part D costs.

Back to FAQs