What Is Coinsurance? A Simple Guide to How Your Costs Are Calculated
Health insurance can be complicated, and coinsurance is one of the most commonly misunderstood terms. Many people ask questions like what does coinsurance mean, how does coinsurance work, or is coinsurance what I pay? If you’ve ever been confused by percentages like 80/20 or 20% coinsurance, you’re not alone.
This guide breaks down what coinsurance is, how it works after your deductible, and what common coinsurance percentages actually mean in real dollars. Our goal is to help you better understand your health insurance costs so you can make confident, informed decisions.
Define Coinsurance: What Does Coinsurance Mean?
Coinsurance is the percentage of a covered medical expense that you are responsible for paying after your deductible has been met. Your insurance company pays the remaining portion.
So when people ask, “Is coinsurance what I pay?” the answer is yes—but only after you’ve paid your deductible.
Coinsurance is a form of cost-sharing. Instead of paying a flat fee, you and your insurance company split the cost of care based on the percentage listed in your plan.
How Does Coinsurance Work?
Coinsurance follows a simple sequence:
You receive medical care.
You pay your deductible.
Coinsurance applies to the remaining covered cost.
You and your insurance company split the bill.
This is why health plans often refer to coinsurance after deductible.
Coinsurance After Deductible: A Real-Life Example
Let’s say your plan includes a $1,500 deductible, 20% coinsurance, and a $5,000 medical bill.
You pay the first $1,500.
The remaining balance is $3,500.
You pay 20% of $3,500, which is $700.
Your insurance pays $2,800.
Your total out-of-pocket cost would be $2,200.
What Does 80/20 Coinsurance Mean?
An 80/20 coinsurance plan means the insurance company pays 80% of covered expenses, and you pay 20% after the deductible is met.
What Does 20% Coinsurance Mean?
20% coinsurance means you are responsible for 20% of the allowed cost of care after meeting your deductible.
What Does 50% Coinsurance Mean?
With 50% coinsurance, you and the insurance company split costs evenly after the deductible.
What Does 100% Coinsurance Mean?
100% coinsurance means you are responsible for the full cost of the service.
What Does 0% Coinsurance Mean?
0% coinsurance means the insurance company covers 100% of the cost of a covered service once the deductible is met.
Coinsurance vs Copay
Coinsurance is a percentage and applies after the deductible.
Copays are fixed dollar amounts and often apply before the deductible.
Coinsurance vs Deductible
A deductible is the amount you pay before insurance begins sharing costs. Coinsurance applies after that deductible is met.
Why Coinsurance Matters
Coinsurance plays a major role in how much you pay for medical care throughout the year. The right balance depends on your health needs, budget, and comfort level with potential out-of-pocket expenses.
The Bottom Line
Coinsurance is simply the way you and your insurance company share medical costs after your deductible is met. Understanding it helps you choose the right health plan with confidence.