Coinsurance is the portion of a covered service you pay as a percentage, for example twenty percent, after you have met your deductible. It is calculated from the plan's allowed amount, not the provider's list price. Coinsurance continues until your spending reaches the out-of-pocket maximum for the year.
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Disclaimer: This definition is provided for general educational purposes only and is not legal, medical, or insurance advice. Insurance rules, deadlines, and terminology vary by plan, state, and over time. Always check your own plan documents and confirm current details before acting.