COPAYMENT: A fixed amount ($20, for example) you pay for a covered health care service after you’ve paid your deductible. Let’s say your health insurance plan’s allowable cost for a doctor’s office visit is $100. Your copayment for a doctor visit is $20.

DEDUCTIBLE: The amount you pay for covered health care services before your insurance plan starts to pay. With a $2,000 deductible, for example, you pay the first $2,000 of covered services yourself. After you pay your deductible, you usually pay only a copayment or coinsurance for covered services. Your insurance company pays the rest.

COINSURANCE: The percentage of costs of a covered health care service you pay (20%, for example) after you’ve paid your deductible.