Copayment/coinsurance in drug plans | Medicare
After you pay your plan's Deductible [glossary] (if your plan has one), the amount you pay for each prescription is either: A Copayment. With a copayment, you pay a set amount (like $10) for all drugs on a tier. You may pay a lower copayment for generic drugs than brand-name drugs. Coinsurance. With coinsurance, you pay a percentage of the cost ...