A copay is a fixed dollar amount you pay when you receive a service, like $30 for a doctor visit. Coinsurance is a percentage of the total allowed cost, like 20% of a hospital bill. Both are forms of cost-sharing between you and your health plan, but they work differently and can show up at different points in your care. Understanding the distinction helps you estimate what you will actually pay when you use your plan.
At a glance
- Copay: A flat, predictable fee per visit or service (e.g., $25 for a primary care visit).
- Coinsurance: A percentage of the allowed cost (e.g., you pay 20%, your plan pays 80%).
- Both count toward your out-of-pocket maximum, after which your plan covers 100% of covered care for the rest of the year.
What is a copay?
A copay (short for copayment) is a set dollar amount you pay at the time of a service. The amount is defined in your plan for specific types of care.
Common examples:
- $25 for a primary care office visit
- $50 for a specialist visit
- $15 for a generic prescription
- $250 for an emergency room visit
Copays are predictable. You know the amount before you walk in the door. Some plans apply copays even before you have met your deductible, particularly for primary care visits and prescriptions. Others require you to meet your deductible first.
What is coinsurance?
Coinsurance is the percentage of a covered service's allowed cost that you pay after you have met your deductible. Your plan pays the remaining percentage.
For example, if your plan has 20% coinsurance for hospital stays and the allowed cost of a procedure is $10,000, you would pay $2,000 and your plan would pay $8,000. Unlike a copay, the amount you owe depends on the total cost of the service.
Hypothetical: Marcus has a plan with a $2,000 deductible and 30% coinsurance. He needs an outpatient procedure that costs $6,000. He has already met his deductible. His share: 30% of $6,000 = $1,800. His plan pays the remaining $4,200.
When each typically applies
Most plans use a combination of copays and coinsurance for different services:
| Service type | Often uses a copay | Often uses coinsurance |
|---|---|---|
| Primary care visit | Yes | Sometimes |
| Specialist visit | Yes | Sometimes |
| Generic prescriptions | Yes | Sometimes |
| Specialty prescriptions | Sometimes | Yes |
| Lab work | Sometimes | Yes |
| Imaging (MRI, CT scan) | Sometimes | Yes |
| Hospital stays | Rarely | Yes |
| Surgery | Rarely | Yes |
| Emergency room | Yes (plus coinsurance in some plans) | Sometimes |
These patterns are common but not universal. Every plan defines its own cost-sharing structure in the Summary of Benefits and Coverage.
How they interact with your deductible
The relationship between your deductible and cost-sharing depends on your plan design:
- Some services have copays before the deductible. Many plans let you see a primary care doctor or fill a generic prescription for a copay without meeting the deductible first. This is common in Silver and Gold plans.
- Coinsurance usually applies after the deductible. For most services, you pay the full allowed cost until your deductible is met, and then coinsurance kicks in.
- Some plans use only coinsurance. Higher-deductible plans (common in Bronze tier) may not have copays at all. Once the deductible is met, coinsurance applies to everything.
How they count toward your out-of-pocket maximum
Both copays and coinsurance payments count toward your plan's out-of-pocket maximum (sometimes called the out-of-pocket limit). This is the most you would pay for covered in-network care in a plan year. Once you reach it, your plan pays 100% of covered services for the rest of the year.
Your deductible also counts toward this maximum. Your monthly premium does not.
Hypothetical: Sonia's plan has a $4,000 deductible, 20% coinsurance, and an $8,000 out-of-pocket maximum. After meeting her deductible, she continues paying 20% coinsurance on covered services. Once her deductible plus coinsurance payments total $8,000, her plan covers everything else for the rest of the year.
Why the same service costs different amounts on different plans
Two plans can charge very different amounts for the same doctor visit, prescription, or procedure. The differences come from:
- Different copay amounts. One plan may charge $25 for a specialist visit while another charges $60.
- Different coinsurance rates. One plan may have 20% coinsurance for hospital care while another has 40%.
- Different deductible levels. A plan with a higher deductible means you pay the full cost longer before cost-sharing begins.
- Copay vs. coinsurance for the same service. One plan might use a $50 copay for imaging, while another uses 30% coinsurance. For a $500 MRI, the copay plan costs you $50; the coinsurance plan costs you $150.
- Network-negotiated rates. Even with the same coinsurance percentage, the allowed cost for a service may differ between plans because of different negotiated rates with providers.
What to check when comparing plans
When you are looking at plans side by side, pay attention to:
- Which services have copays before the deductible? Plans that let you see a doctor for a copay without meeting the deductible first can be valuable if you use regular care.
- What is the coinsurance rate after the deductible? The difference between 20% and 40% coinsurance can add up quickly for expensive care.
- What is the out-of-pocket maximum? This is your financial ceiling. A lower out-of-pocket maximum provides more protection if you have a high-cost year.
- How does the plan handle prescriptions? Check whether your medications have copays, coinsurance, or both, and at what tier.
- What is the total cost, not just the premium? A plan with a low monthly premium but high copays and coinsurance could cost more overall than a plan with a higher premium and lower cost-sharing, depending on how much care you use.
What to do next
Primary action: Compare plans to see how copays, coinsurance, deductibles, and premiums work together for plans available in your area.
Alternative: If you want help figuring out which cost-sharing structure fits your healthcare needs and budget, call or chat with a licensed agent at Healthcare.com.
This article provides general educational information, not legal, tax, or financial advice. Plan availability, pricing, subsidies, and benefits depend on individual circumstances, location, and the current plan year, and may change.
Sources
- HealthCare.gov Glossary: Copayment (opens in a new tab)
- HealthCare.gov Glossary: Coinsurance (opens in a new tab)
- HealthCare.gov: Understanding plan costs (opens in a new tab)
- CMS: Consumer resources on health plan costs
