Coinsurance is the amount of money you must pay for a health service, such as a doctor's appointment or a prescription, calculated as a percentage of the total cost of care. For instance, you may have a 20% coinsurance. If a doctor's visit costs $100, then you pay $20. Your health plan pays $80. You may have to pay your deductible before the insurance applies. 


WebMD Medical Reference Reviewed by Sarah Goodell on June 16, 2020
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