Coinsurance

Your share of the costs of a covered health care service, calculated as a percentage (for example, 20%) of the allowed amount for the
service. You generally pay coinsurance plus any deductibles you owe. (For example, if the health insurance or plan’s allowed amount for an office visit is $100 and you’ve met your deductible, your coinsurance payment of 20% would be $20. The health insurance or plan pays the rest of the allowed amount.)