Deductible vs Copay vs Coinsurance: How Each Cost Works

By Laurel C. Yazzie | Last reviewed: August 2026

When you look at a health insurance plan, three cost-sharing terms appear on nearly every document: deductible, copay, and coinsurance. Each one describes a different way you share medical costs with your insurer, and each one applies at a different stage of your coverage. Understanding the difference between deductible vs copay vs coinsurance is one of the most practical things you can do before choosing a plan or opening a medical bill.

Having worked directly with clients on health plan selection for nearly a decade, the most common misconception I encountered was that meeting the deductible means your insurance company takes over all remaining costs. That is rarely how it works. Coinsurance typically kicks in after the deductible, and copays can apply at any point during the year.

This guide explains what each term means, how they interact in a real plan year, and how to use that knowledge to pick the right plan for your situation. For a broader look at how coverage is structured, see our guide on how health insurance works.

Deductible vs Copay vs Coinsurance: At a Glance

Before covering each term in depth, here is a side-by-side comparison of all three cost types:

What Is a Health Insurance Deductible?

Your deductible is the dollar amount you pay out of pocket for covered health care services before your insurance plan begins to share the cost. Until you reach this threshold, you are generally responsible for the full cost of most covered services.

Key things to know about how deductibles work:

• They reset every plan year. Regardless of how much you paid the year before, your deductible starts at zero again at the beginning of each new plan year.
• Preventive care is usually exempt. Under the Affordable Care Act, most plans must cover preventive services (annual physicals, recommended screenings, vaccinations) at no cost, even before the deductible is met.
• Some plans have separate individual and family deductibles. An individual deductible applies to a single person’s care. A family deductible is a combined threshold for everyone on the plan. Some plans use an “embedded” structure where each family member also has their own individual sub-limit within the family deductible.
• Copays may still apply before the deductible is met. Many plans charge a flat copay for primary care visits and prescriptions even while you are still working toward your deductible.

What Is a Copay?

A copay (short for copayment) is a predetermined, fixed dollar amount you pay for a specific covered service. It is the same amount every time you use that type of service, regardless of what the provider actually bills. You pay it at the time of the visit or when picking up a prescription.

Common services that typically use copays include:

• Primary care physician visits
• Specialist appointments
• Urgent care visits
• Emergency room visits
• Prescription refills (amounts often vary by drug tier)

Your copay amounts are listed in your plan’s Summary of Benefits and Coverage (SBC) document and are often printed on your insurance ID card. One nuance worth knowing: copays generally do not count toward meeting your deductible. However, they do count toward your out-of-pocket maximum on most plans.

Some plans only apply copays after the deductible is met, while others charge copays from day one. Your SBC document will spell out exactly how your plan handles this. Always read it before your first appointment of the year.

What Is Coinsurance in Health Insurance?

Coinsurance is your percentage share of covered medical costs after you have met your deductible. Your insurance company pays the remainder. A common example is an 80/20 split, where your insurer covers 80% and you pay 20% of covered costs, though the exact percentage varies by plan.

Coinsurance most commonly applies to higher-cost services such as:

• Inpatient hospital stays
• Surgeries and outpatient procedures
• Diagnostic imaging (MRIs, CT scans, X-rays)
• Specialist care
• Certain prescription medications

As an example: you have already met your $1,500 deductible. A specialist visit is billed at $500 (at the insurer-negotiated rate). With 20% coinsurance, you pay $100 and your insurance covers $400. According to the Insurance Information Institute, understanding your plan’s coinsurance rate is one of the most important factors in estimating your total annual health care costs, particularly if you anticipate needing specialist or hospital care.

How a Deductible, Copay, and Coinsurance Work Together

The three costs are not alternatives to each other. They are layered. In a typical plan year, all three can apply to the same person, sometimes in the same month. Here is how the sequence plays out using a hypothetical plan with a $1,500 deductible, a $30 copay for primary care visits, 20% coinsurance, and a $6,000 out-of-pocket maximum.

1. January: You visit your primary care doctor for a routine concern. Your plan charges a $30 copay for this visit, even though you have not yet paid anything toward your deductible. You pay $30. Deductible balance remaining: $1,500.
2. February: You get an MRI for knee pain. The insurer-negotiated rate is $900. Since you have not met your deductible, you pay the full $900. Deductible balance remaining: $600.
3. April: You see an orthopedic specialist. The visit costs $400. You still owe $600 on your deductible, so you pay the full $400. Deductible balance remaining: $200.
4. June: You need a minor outpatient procedure billed at $1,000. You still owe $200 toward your deductible, so you pay that $200 first. Your deductible is now met. The remaining $800 of the bill is subject to 20% coinsurance. You pay $160. Your insurer pays $640. Total cost for this service: $360.
5. For the rest of the year: Your deductible is met. Every covered service now applies only coinsurance, until you reach the $6,000 out-of-pocket maximum. At that point, your insurer covers 100% of covered costs through the end of the plan year.

This sequence is the piece most people do not see clearly when comparing plans. The deductible, copay, and coinsurance are not separate features. They are a cost-sharing progression, and knowing where you are in that progression determines exactly what you owe.

What Happens When You Hit Your Out-of-Pocket Maximum?

Your out-of-pocket maximum is the cap on what you can spend on covered in-network services in a single plan year. Every dollar you pay toward your deductible, every copay, and every coinsurance amount counts toward it. Once you reach that cap, your insurer covers 100% of covered costs for the remainder of the year.

According to the National Association of Insurance Commissioners, reviewing your plan’s out-of-pocket maximum is one of the clearest ways to understand your total financial exposure in a worst-case health scenario. For a detailed breakdown of how this limit works and what expenses count toward it, see our guide on how your out-of-pocket maximum works.

How to Choose: Copay Plans vs. Coinsurance Plans

Not every health plan uses the same cost-sharing structure. Some plans rely primarily on flat copays for most services. Others use coinsurance across the board after a deductible. Choosing between them depends on how you expect to use your coverage during the year.

Use this decision framework:

• If you use health care regularly: You see your doctor frequently, manage a chronic condition, or fill prescriptions month to month. In this case, a plan with lower, predictable copays will likely cost less overall. Fixed fees make budgeting straightforward and protect you from variable costs on routine care.
• If you rarely need care but want protection from major expenses: Your main concern is a hospitalization, surgery, or serious diagnosis. Focus on the coinsurance rate and the out-of-pocket maximum rather than copay amounts. A higher deductible paired with a lower coinsurance rate (and a Health Savings Account, if eligible) can limit your exposure on large bills while keeping premiums lower.
• If you are comparing plans and unsure which fits: Look at the full annual cost picture. Add your monthly premium times 12, estimate your likely copay and coinsurance payments based on past usage, and compare total expected costs across each plan, not just the monthly premium.

From a practical standpoint, many people underestimate how much coinsurance can accumulate after a hospital stay. A 30% coinsurance rate on a $20,000 inpatient bill leaves you with a $6,000 obligation, even after meeting your deductible. Knowing your coinsurance rate before a major procedure, not after, is one of the most important steps in managing health care costs.

Frequently Asked Questions About Deductibles, Copays, and Coinsurance

Below are the most common questions people have after learning how these three costs work together:

• Can I pay both a copay and coinsurance for the same visit?
• Does my copay count toward my deductible?
• What happens to my deductible if I switch health plans mid-year?
• Is a plan with no deductible always the best deal?
• Do copays count toward my out-of-pocket maximum?

Can I pay both a copay and coinsurance for the same visit?

Yes, this can happen. Some plans charge a flat copay for the office visit itself and then apply coinsurance to any procedures or services performed during that same appointment if they are billed separately. For example, you might pay a $40 copay for seeing your specialist and then owe 20% coinsurance on a biopsy performed at the same visit. Check your Summary of Benefits and Coverage to see how your specific plan handles this.

Does my copay count toward my deductible?

On most plans, copays do not count toward your deductible. They are a separate cost-sharing tool. However, copays do typically count toward your out-of-pocket maximum. This means heavy copay use can still push you toward your annual spending cap, even though it is not reducing your deductible balance. Your plan’s SBC document will confirm exactly how copays are applied.

What happens to my deductible if I switch health plans mid-year?

Your deductible progress does not transfer to a new plan. If you switch plans, your deductible resets to zero on the new plan’s effective date. This can result in significantly higher out-of-pocket costs if you have already spent thousands toward your previous plan’s deductible and then switch to a new plan with its own separate threshold mid-year. Factor this in carefully before changing coverage outside of open enrollment.

Is a plan with no deductible always the best deal?

Not necessarily. Plans with no deductible usually carry higher monthly premiums or higher coinsurance rates. You pay more upfront each month in exchange for lower costs at the point of care. Whether this trade-off works in your favor depends on how often you use health care. A person who rarely sees a doctor may pay substantially more over a year with a no-deductible plan than with a higher-deductible plan that has lower premiums.

Do copays count toward my out-of-pocket maximum?

On most plans, yes. Every copay you pay during the year moves you closer to your out-of-pocket maximum. Once you reach that limit, your insurance covers 100% of covered in-network services for the remainder of the plan year, and you no longer owe copays or coinsurance. This protection matters most in years when you need frequent or costly care. What most people miss when reading their policy is the exact list of costs the plan counts toward this cap, so review that section of your SBC carefully.

For a complete look at health insurance coverage, plan types, and terminology across all major topics, visit our complete health insurance guide.