A fixed amount (for example, $15) you pay for a covered health care service, usually when you get the service. The amount can vary by the type of covered health care service.
Your share of the costs of a covered health care service, calculated as a percent (for example, 20%) of the allowed amount for the service. You pay coinsurance plus any deductibles you owe.
The amount you owe for health care services your health insurance or plan covers before your health insurance or plan begins to pay.