Coinsurance is your share of the costs of a health care service. It’s usually figured as a percentage of the total charge for the service. You pay coinsurance plus any deductibles you still owe.
Say you’ve already paid out (or met) your $1,500 deductible and your coinsurance is 20 percent. For a $100 health care bill, you would pay $20 and your insurance company would pay $80.
For more information, please read the What is coinsurance? article in the Help Center.