Skip Navigation

Copayment/coinsurance in drug plans

The amount you pay for each of your prescriptions after you have paid the deductible (if your plan has one) is either a copayment or coinsurance. Some Medicare Prescription Drug Plans have different levels or " tiers " of copayments or coinsurance, with different costs for different types of drugs.

  • With a copayment, you pay a set amount (like, $10) for all drugs on a tier. For example, you may pay a lower copayment for generic drugs than brand-name drugs.
  • Coinsurance means you pay a percentage of the cost (like, 25%) of the drug.

Usually, the amount you pay for a covered prescription is for a one-month supply of a drug. However, you can request less than a one-month supply for most types of drugs. You might do this if you’re trying a new medication that’s known to have significant side effects or you want to synchronize the refills for all your medications. If you do this, the amount you pay is reduced based on the quantity you actually get. Talk with your prescriber to get a prescription for less than a one-month supply.