COINSURANCE
Back to GlossaryDefinition
The percentage of costs a patient pays for medical expenses – such as a hospital stay, office visit, medical device, or prescription drug
Summary
Coinsurance is your share of medical costs after you've met your deductible, expressed as a percentage. Unlike a fixed copay amount, coinsurance means you pay a percentage of the total cost while your insurance covers the rest. For example, with 20% coinsurance, you pay 20% of the bill and insurance pays 80%. This cost-sharing mechanism helps insurance companies manage risk while keeping premiums lower, but it means your out-of-pocket costs can vary significantly depending on the expense of your medical care.
Usage Context
Understanding coinsurance is crucial when comparing health insurance plans, calculating potential medical expenses, and making healthcare decisions. It's particularly important when studying healthcare economics, insurance plan design, and patient financial responsibility.
Common Confusions
- Thinking coinsurance and copays are the same thing
- Believing coinsurance applies before meeting the deductible
- Assuming coinsurance percentages are the same for all services
- Confusing coinsurance with the insurance company's payment percentage
- Not understanding that coinsurance can result in unlimited costs without an out-of-pocket maximum
