Health insurance can protect you from major medical expenses, but having coverage doesn’t necessarily mean your healthcare is free.
Most health plans require members to share some of the cost of covered medical services. Two common forms of cost sharing are copayments and coinsurance.
Although both involve paying part of your healthcare costs, they work differently.
A copay, short for copayment, is generally a fixed dollar amount you pay for a particular covered healthcare service.
Coinsurance is generally a percentage of the allowed cost of a covered healthcare service that you’re responsible for paying.
For example, your health plan might require a $30 copay for a primary care visit but 20% coinsurance for certain other services after you meet your deductible.
Understanding the difference can help you estimate healthcare expenses, compare insurance plans, and avoid surprises when medical bills arrive.
What Is a Copay?
A copayment is generally a predetermined fixed amount you pay for a covered healthcare service.
Examples might include:
- $25 for a primary care visit
- $50 for a specialist visit
- $75 for urgent care
- $15 for a generic prescription
The actual amount depends on your health plan.
Suppose your insurance card says:
Primary Care Copay: $30
If you receive an eligible in-network primary care service subject to that copay, you may pay $30 regardless of the provider’s full billed charge, subject to your plan’s rules.
The insurer handles the remaining eligible amount according to the plan.
What Is Coinsurance?
Coinsurance works differently because your cost is calculated as a percentage rather than a fixed dollar amount.
For example:
Coinsurance: 20%
If your health plan’s allowed amount for a covered service is $1,000 and the service is subject to 20% coinsurance after the deductible, your share could be:
$1,000 × 20% = $200
The health plan would generally be responsible for the remaining eligible amount under the plan.
The important distinction is that your coinsurance amount changes with the cost of the service.
Copay vs. Coinsurance at a Glance
| Copay | Coinsurance |
|---|---|
| Usually a fixed dollar amount | Usually a percentage |
| Often predictable before care | Cost varies with the service |
| Example: $30 office visit | Example: 20% of allowed amount |
| Common for doctor visits and prescriptions | Common for larger medical services |
| May apply before or after deductible depending on plan | Frequently applies after deductible |
Your Summary of Benefits and Coverage or other plan documents explain how your particular insurance works.
Simple Copay Example
Suppose your health insurance provides:
Primary care visit: $25 copay
You visit an in-network doctor for an eligible covered service.
Under the plan’s rules, your responsibility may simply be:
$25
This makes copays relatively easy to budget for because the amount is usually known in advance.
Simple Coinsurance Example
Now suppose you need an eligible outpatient procedure.
Your plan has:
20% coinsurance after deductible
Assume you have already satisfied the applicable deductible.
If the plan’s allowed amount for the procedure is:
$2,000
Your coinsurance could be:
20% × $2,000 = $400
Your insurer would generally pay its applicable portion of the allowed amount.
Why Coinsurance Can Be Harder to Predict
Copays are usually straightforward because they are fixed amounts.
Coinsurance can be more difficult to estimate because your responsibility depends on the cost recognized by your health plan.
For example, 20% coinsurance could mean:
$100 service → $20
$1,000 service → $200
$10,000 service → $2,000
These simplified calculations assume the deductible has been satisfied and that no other plan provisions change the amount.
For expensive healthcare, coinsurance can therefore result in considerably larger out-of-pocket expenses than a typical office-visit copay.
How the Deductible Fits In
To fully understand copays and coinsurance, you also need to understand the deductible.
A deductible is generally the amount you must pay for certain covered healthcare services before your health plan begins paying according to its cost-sharing rules.
Suppose your plan has:
Annual deductible: $2,000
Coinsurance after deductible: 20%
You may need to pay eligible costs subject to the deductible until you’ve satisfied the $2,000 deductible.
Afterward, you may pay 20% coinsurance for applicable covered services.
Do Copays Count Toward the Deductible?
It depends on the health plan.
Some plans provide certain services for a copay before the deductible is satisfied.
For example, you might have:
$30 primary care copay
even though you haven’t yet reached your annual deductible.
Whether those copayments also count toward the deductible depends on the plan.
Don’t assume that paying $500 in copays means you’ve reduced your deductible by $500.
Review your plan documents.
Do Copays Count Toward the Out-of-Pocket Maximum?
For many ACA-compliant health plans, qualifying cost sharing for covered in-network essential health benefits generally counts toward the annual out-of-pocket limit.
This can include applicable:
- Deductibles
- Copayments
- Coinsurance
However, not every healthcare expense necessarily counts.
For example, premiums generally don’t count toward the out-of-pocket maximum.
Out-of-network costs and non-covered services may also be treated differently.
What Is an Out-of-Pocket Maximum?
The out-of-pocket maximum is an important financial protection in many health insurance plans.
It limits how much you must pay during a plan year for qualifying covered in-network healthcare expenses that count toward the limit.
Once you reach the applicable maximum, the plan generally pays 100% of covered in-network benefits for the remainder of the plan year.
This means coinsurance does not necessarily continue indefinitely.
Example: Deductible + Coinsurance + Out-of-Pocket Maximum
Suppose a hypothetical health plan has:
Deductible: $2,000
Coinsurance: 20%
Out-of-pocket maximum: $7,500
During the year, you receive significant covered in-network medical care.
First, you may be responsible for eligible expenses until you satisfy the deductible.
After the deductible, you may pay applicable copays and coinsurance.
If qualifying cost sharing reaches the $7,500 out-of-pocket maximum, the insurer generally pays 100% of additional covered in-network benefits for the rest of the plan year.
Premiums are separate.
Premium vs. Copay vs. Deductible vs. Coinsurance
These four terms are frequently confused.
| Cost | What It Generally Means |
|---|---|
| Premium | Amount paid to maintain insurance coverage |
| Deductible | Amount paid toward certain covered expenses before applicable plan cost sharing begins |
| Copay | Fixed amount for a particular covered service |
| Coinsurance | Percentage of the allowed cost you pay |
Understanding all four is important when comparing health plans.
When Do You Usually Pay a Copay?
Copays are commonly associated with services such as:
- Primary care visits
- Specialist visits
- Urgent care
- Prescription drugs
- Mental health visits
- Certain telehealth services
Your plan determines which services use copays.
A plan might use a $40 specialist copay while applying coinsurance to hospital services.
When Does Coinsurance Usually Apply?
Coinsurance may be used for services such as:
- Hospital stays
- Outpatient procedures
- Imaging
- Surgery
- Laboratory services
- Durable medical equipment
- Certain prescription drugs
- Specialist services
Again, plan structures vary considerably.
Copays and Prescription Drugs
Prescription drug coverage often uses copays, particularly for lower-cost medications.
A plan might have a structure such as:
Tier 1 generic: $10 copay
Tier 2 preferred brand: $40 copay
Tier 3 non-preferred brand: $75 copay
Other medications may use coinsurance instead.
For example, certain specialty medications might require a percentage of the plan’s allowed cost, subject to applicable limits and plan rules.
Coinsurance and Hospital Care
Coinsurance can become particularly important for expensive hospital services.
Suppose you’ve satisfied your deductible and receive an eligible hospital service with an allowed amount of:
$20,000
Your coinsurance is:
20%
A simplified calculation gives:
$20,000 × 20% = $4,000
However, your actual responsibility could be limited by how close you already are to the plan’s out-of-pocket maximum.
Copay vs. Coinsurance Example
Consider two hypothetical plans.
Plan A
Specialist visit: $50 copay
You visit an eligible in-network specialist.
Your applicable cost may be:
$50
Plan B
Specialist visit: 20% coinsurance after deductible
The allowed amount is $300.
If your deductible has already been satisfied:
$300 × 20% = $60
In this example, Plan A costs $50 while Plan B costs $60.
But if the allowed amount under Plan B were $500, the 20% coinsurance could be $100.
Is a Copay Better Than Coinsurance?
Not necessarily.
A copay can provide more predictable expenses because you generally know the fixed amount in advance.
Coinsurance can result in higher expenses for costly healthcare.
However, you shouldn’t choose a health plan based only on whether it uses copays or coinsurance.
You should evaluate the entire plan, including:
- Monthly premium
- Deductible
- Out-of-pocket maximum
- Provider network
- Prescription coverage
- Copays
- Coinsurance
- Covered services
A plan with attractive copays could still have a high premium or other significant costs.
Allowed Amount vs. Billed Charge
Coinsurance is generally based on the health plan’s allowed amount, not necessarily the provider’s original billed charge for an in-network covered service.
Suppose a hospital bills:
$5,000
But your insurer’s negotiated allowed amount is:
$3,000
If you owe 20% coinsurance, the calculation may generally be based on the $3,000 allowed amount:
$3,000 × 20% = $600
rather than 20% of the original $5,000 bill.
Network status and plan rules matter significantly.
Why In-Network Care Matters
Health insurance companies negotiate rates with participating healthcare providers.
Using an in-network provider can generally provide access to these negotiated rates and the plan’s normal cost-sharing protections.
Out-of-network care can potentially result in:
- Higher deductibles
- Higher coinsurance
- Separate out-of-pocket limits
- Balance billing in situations where it is legally permitted
- No coverage under some plans
Federal protections against certain surprise medical bills apply in specific circumstances, but they do not make every out-of-network service equivalent to in-network care.
Preventive Care Can Work Differently
Certain preventive healthcare services are generally covered without cost sharing under many Affordable Care Act-compliant plans when eligibility requirements are met and services are obtained appropriately in-network.
Examples can include certain:
- Vaccinations
- Screening tests
- Preventive counseling
- Wellness services
However, a visit may generate cost sharing when additional diagnostic or non-preventive services are provided.
Always check your plan.
Family Deductibles and Cost Sharing
Family health plans can add another layer of complexity.
A plan may have:
- Individual deductibles
- Family deductible
- Individual out-of-pocket limits
- Family out-of-pocket limit
The way family members’ expenses accumulate toward these limits depends on the plan design.
Families should review these provisions carefully when comparing coverage.
How Copays Affect Healthcare Budgeting
Copays make certain routine expenses easier to estimate.
Suppose your family expects:
- 6 primary care visits at $30 each
- 4 specialist visits at $60 each
- 12 generic prescriptions at $10 each
Estimated copays:
Primary care:
6 × $30 = $180
Specialists:
4 × $60 = $240
Prescriptions:
12 × $10 = $120
Total:
$540
This type of calculation can help estimate routine healthcare spending, although unexpected services may add substantial costs.
How Coinsurance Affects Healthcare Budgeting
Coinsurance requires more uncertainty.
If you know you may need:
- Surgery
- Expensive imaging
- Specialist treatment
- Hospital care
you should pay particular attention to:
Deductible + coinsurance + out-of-pocket maximum
The out-of-pocket maximum can be especially useful when evaluating your worst-case potential cost for covered in-network care during the plan year.
Comparing Two Health Plans
Imagine you’re choosing between these simplified plans:
| Feature | Plan A | Plan B |
|---|---|---|
| Monthly Premium | $600 | $425 |
| Deductible | $1,000 | $3,000 |
| Primary Care | $25 copay | $40 copay |
| Specialist | $50 copay | 20% after deductible |
| Coinsurance | 10% | 20% |
| Out-of-Pocket Maximum | $5,500 | $8,000 |
Plan B has a lower monthly premium.
But someone expecting significant healthcare use might potentially spend more when receiving care.
Plan A costs more every month but may provide lower cost sharing.
Neither plan is automatically better.
The right choice depends on your expected healthcare use, finances, provider needs, prescriptions, and tolerance for unexpected expenses.
How to Estimate Your Total Healthcare Cost
Don’t compare plans using the premium alone.
Consider:
Annual premiums + expected out-of-pocket expenses
Suppose:
Plan A
Annual premium: $7,200
Expected medical cost sharing: $1,500
Estimated total:
$8,700
Plan B
Annual premium: $5,100
Expected medical cost sharing: $4,000
Estimated total:
$9,100
Although Plan B has the lower premium, Plan A would be less expensive under this hypothetical usage scenario.
Actual healthcare needs are impossible to predict perfectly, so also compare potential high-cost scenarios.
Questions to Ask Before Choosing a Health Plan
Before enrolling, check:
- What is the monthly premium?
- What is the annual deductible?
- What are the primary care copays?
- What are the specialist copays?
- Which services use coinsurance?
- Does cost sharing apply before or after the deductible?
- What is the out-of-pocket maximum?
- Are my doctors in-network?
- Are my prescriptions covered?
- Are there separate drug deductibles?
- How is emergency care handled?
- What are the out-of-network rules?
The answers provide a much clearer picture than the premium alone.
Common Mistakes to Avoid
Thinking Copays and Coinsurance Are the Same
A copay is usually a fixed amount. Coinsurance is generally a percentage.
Assuming a Copay Always Applies Before the Deductible
Some services may require the deductible to be satisfied first.
Calculating Coinsurance From the Sticker Price
Coinsurance is typically based on the plan’s applicable allowed amount for covered services.
Ignoring the Out-of-Pocket Maximum
This number can be one of the most important measures of potential financial exposure.
Choosing a Plan Based Only on Premium
Low-premium plans can have higher deductibles and cost sharing.
Ignoring Provider Networks
Using out-of-network providers can dramatically change your costs.
Assuming All Preventive Visits Are Free
Qualifying preventive services may have no cost sharing, but diagnostic or additional services can result in charges.
Frequently Asked Questions
What is the difference between a copay and coinsurance?
A copay is generally a fixed dollar amount for a covered healthcare service, while coinsurance is generally a percentage of the plan’s allowed cost.
Is a $30 copay better than 20% coinsurance?
It depends on the service cost and the rest of the health plan. A fixed copay may be more predictable, but the entire plan should be compared.
Do I pay coinsurance before meeting my deductible?
Often coinsurance applies after the deductible, but health plan structures vary.
Can I have both copays and coinsurance?
Yes. Many health plans use both for different types of healthcare services.
Do copays count toward my out-of-pocket maximum?
Qualifying copays for covered in-network essential health benefits generally count toward applicable ACA out-of-pocket limits, but plan rules and coverage type matter.
Do premiums count toward my out-of-pocket maximum?
Generally, no.
Does coinsurance stop after I reach my out-of-pocket maximum?
For applicable covered in-network benefits under plans with an out-of-pocket maximum, the plan generally pays 100% of covered benefits after the qualifying annual limit is reached.
Is coinsurance based on the hospital’s full bill?
For covered in-network care, it is generally calculated using the plan’s allowed amount rather than simply the provider’s original billed charge.
Can prescriptions have coinsurance?
Yes. Some prescription tiers, particularly specialty drugs, may use coinsurance rather than a fixed copay.
Why does my copay differ for specialists?
Health plans commonly establish different copay amounts for different categories of care.
Final Thoughts
Copays and coinsurance are both forms of health insurance cost sharing, but they affect your healthcare budget differently.
A copay generally gives you a predictable fixed cost for a particular covered service.
Coinsurance requires you to pay a percentage of the applicable allowed cost, meaning your expense can increase when healthcare services are more expensive.
Neither number should be evaluated in isolation.
When comparing health insurance, look at the complete financial picture:
Premium + deductible + copays + coinsurance + out-of-pocket maximum
You should also consider provider networks, prescription coverage, expected healthcare use, and your ability to manage unexpected expenses.
Understanding these terms before you need medical care can make your insurance easier to use and help you make more informed coverage decisions.