10/17/2026
Copays and coinsurance both describe how costs are shared, but they work very differently.
A copay is a fixed dollar amount you pay for a specific service.
For example:
$30 to see your primary care doctor
$75 for an urgent care visit
$15 for a generic prescription
You know the cost up front, regardless of the total bill.
Coinsurance, on the other hand, is a percentage split between you and the insurance company.
For example:
20% coinsurance means you pay 20% of the allowed cost
The insurance company pays the remaining 80%
So if a service costs $1,000, you’d owe $200.
Copays = predictable
Coinsurance = variable
Coinsurance amounts depend on:
The total cost of the service
Whether you’ve met your deductible
Network pricing agreements
When reviewing plan documents:
Look for copays for routine services (doctor visits, prescriptions)
Expect coinsurance for bigger expenses (imaging, hospital care, procedures)
Once you know which is which, plan summaries stop feeling confusing — and start feeling readable.