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  What is coinsurance?
 
Coinsurance is the term used by health insurance companies to refer to the amount that you are required to pay for a medical claim, apart from any co-payments or deductible. For example, if your health insurance plan has a 20% coinsurance requirement (and does not have any additional co-payment or deductible requirements), then a $100 medical bill would cost you $20, and the insurance company would pay the remaining $80.
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