This content is for general informational purposes and does not constitute medical, legal, or financial advice. Healthcare rules and costs change annually. Last reviewed: January 1, 2025. Always verify current details with your insurer, employer, or a licensed healthcare navigator.
Coinsurance
Your share of costs after meeting your deductible, expressed as a percentage.
Full Definition
Coinsurance is the percentage of a covered service's cost you pay after you've met your deductible. For example, with 20% coinsurance, your insurer pays 80% and you pay 20% of the allowed amount. Coinsurance continues until you reach your out-of-pocket maximum, at which point your insurer covers 100%.
Real-World Example
You've met your deductible. Your plan has 20% coinsurance. You receive a $500 covered bill — you owe $100 (20%) and your insurer pays $400 (80%).
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