At its simplest, health insurance works by sharing the cost of covered health care between you and your insurance company.
A typical process looks like this:
You choose and enroll in a health insurance plan.
You pay your monthly premium.
You visit a doctor, hospital, pharmacy, or other health care provider.
The provider submits information about your care to the insurance company.
Your insurance company processes the claim according to your plan.
You pay any applicable deductible, copayment, or coinsurance.
The insurance company pays its portion of the covered expense.
You continue sharing eligible costs until you reach your applicable out-of-pocket maximum.
The exact amount you pay depends on the health insurance plan you have.
This is why understanding the different parts of a health insurance plan is important before choosing coverage.
Why Do People Need Health Insurance?
Medical care in the United States can be expensive.
A routine doctor's appointment may be manageable for many people, but major medical expenses can become much more difficult to handle.
For example, medical costs can increase significantly when someone needs:
Emergency treatment
Hospitalization
Surgery
Specialist care
Diagnostic tests
Prescription medications
Ongoing medical treatment
Physical therapy
Maternity care
Health insurance can help protect you from having to pay the full cost of covered medical care yourself.
Instead, you and the insurance company generally share eligible costs according to the rules of your plan.
Health insurance can therefore provide both access to covered health care services and financial protection against potentially large medical bills.
The Main Health Insurance Costs You Need to Understand
If you want to understand how health insurance works, start with these five important terms:
Premium
Deductible
Copayment
Coinsurance
Out-of-pocket maximum
Each one affects how much you may pay for health care.
Let's look at them one by one.
What Is a Health Insurance Premium?
A health insurance premium is the amount you pay for your health insurance coverage.
Premiums are commonly paid every month.
For example, imagine your health insurance premium is $400 per month.
You would generally pay $400 each month to maintain your coverage according to your plan's payment requirements.
One important thing to understand is that you generally pay your premium even if you don't visit a doctor during that month.
Does Your Premium Pay for Everything?
No.
Your premium pays for the insurance coverage itself. It does not necessarily mean that every medical service will be free.
Depending on your plan, you may still have to pay:
Deductibles
Copayments
Coinsurance
Certain out-of-network costs
Costs for services that aren't covered
That's why you shouldn't compare health insurance plans based only on their monthly premiums.
What Is a Health Insurance Deductible?
A deductible is the amount you generally pay for certain covered health care services before your insurance plan begins paying its share.
For example, suppose you have a $2,000 deductible.
You may have to pay $2,000 toward applicable covered services before the insurance company begins sharing those costs according to your plan.
However, the deductible does not necessarily apply to every medical service.
Some services may be covered before you meet the deductible, depending on your plan and applicable coverage rules.
Example of a Deductible
Imagine you have a:
$2,000 health insurance deductible
You receive a covered service that results in $800 of applicable costs.
You may have to pay that $800 yourself.
Later, you receive another applicable covered service costing $1,200.
If the entire amount applies toward your deductible, you have now reached your $2,000 deductible.
After that, your insurance plan may begin sharing the costs of covered services through copayments or coinsurance.
This is a simplified example. Actual health insurance costs can depend on negotiated rates, covered services, network rules, and the specific terms of your plan.
What Is a Copayment?
A copayment, often called a copay, is generally a fixed amount you pay for a covered health care service.
For example, your health plan might require:
$25 for a primary-care visit
$50 for a specialist visit
$40 for a prescription
These are only examples. Your actual copay amounts depend on your specific insurance plan.
Different services may have different copays.
Some plans may also apply the deductible before certain copayments become available.
Always check the details of your plan to understand when and how copays apply.
What Is Coinsurance?
Coinsurance is generally a percentage of the cost of a covered health care service that you pay after applicable deductible requirements have been met.
For example, suppose your health insurance plan has 20% coinsurance.
If the allowed cost of a covered service is $1,000, your share would be:
$1,000 × 20% = $200
The insurance company would generally pay the remaining $800, subject to the terms of your plan.
Coinsurance is especially important when medical services are expensive because even a relatively small percentage can result in a significant out-of-pocket expense.
What Is an Out-of-Pocket Maximum?
The out-of-pocket maximum is an important part of many health insurance plans.
It is a limit on what you pay during a plan year for covered services under the plan's applicable rules.
Once you reach the applicable out-of-pocket maximum for covered services, your insurance plan generally pays 100% of covered benefits for the remainder of the coverage period, subject to the plan's terms.
The out-of-pocket maximum generally does not include:
Monthly insurance premiums
Services that aren't covered
Certain out-of-network expenses
Amounts above the allowed amount
For 2026 Marketplace plans, the federal maximum out-of-pocket limit is $10,600 for an individual and $21,200 for a family. Individual plans can have lower limits.
Because these limits and plan rules can change, always check the current details of the specific plan you are considering.
A Simple Example of How Health Insurance Works
Let's use a simple hypothetical example.
Imagine Sarah has a health insurance plan with:
$350 monthly premium
$2,000 deductible
$30 copay for certain doctor visits
20% coinsurance
$6,000 out-of-pocket maximum
Sarah pays her monthly premium to keep her coverage active.
Later in the year, she needs medical treatment.
Depending on the service and her plan's rules, Sarah may first have to pay applicable expenses toward her deductible.
After meeting the deductible, she may have to pay a copay or coinsurance for additional covered services.
If her covered in-network expenses become high enough to reach her $6,000 out-of-pocket maximum, the plan would generally pay 100% of covered in-network benefits for the remainder of the coverage period.
This example is only meant to explain the basic concept. Real health insurance claims can involve different deductibles, negotiated rates, exclusions, networks, and cost-sharing rules.
What Happens When You Visit a Doctor?
The exact process depends on your health insurance plan, but the general process usually looks something like this.
Step 1: Choose a Health Care Provider
You choose a doctor, clinic, hospital, or other medical provider.
Before receiving care, it can be useful to check whether the provider is in network with your insurance plan.
Step 2: Receive Medical Care
You visit the provider and receive a medical service.
The service may be covered by your insurance depending on your plan.
Step 3: The Provider Submits the Claim
The provider sends information about the medical service to the insurance company.
Step 4: The Insurance Company Processes the Claim
The insurance company reviews the claim and determines how much of the service is covered under your plan.
Step 5: You Pay Your Share
Depending on the plan and service, you may have to pay:
Deductible
Copayment
Coinsurance
Other applicable charges
Step 6: You Receive an Explanation of Benefits
After a claim is processed, you may receive an Explanation of Benefits, commonly called an EOB.
An EOB explains how the insurance company processed the claim and how much you may owe.
An EOB is generally not the same thing as a medical bill.
What Is a Health Insurance Provider Network?
A health insurance provider network is a group of doctors, hospitals, pharmacies, and other health care providers that have agreements with an insurance company or health plan.
Using in-network providers can generally help reduce your health care costs.
Depending on your plan, out-of-network care may:
Cost more
Have a separate deductible
Have different coinsurance
Not be covered except in certain circumstances
That's why checking a plan's network before enrolling can be extremely important.
Why Should You Check the Network?
Before selecting a health insurance plan, consider checking whether your preferred:
Primary-care doctor
Specialists
Hospital
Pharmacy
Clinics
Other important providers
are included in the plan's network.
If you already have a doctor you trust, making sure that doctor is in network may be particularly important.
HMO vs. PPO: How Do They Work?
Two common types of health insurance plans are HMO and PPO plans.
What Is an HMO?
HMO stands for Health Maintenance Organization.
HMO plans generally emphasize using doctors and other providers within the plan's network.
Out-of-network care is generally not covered except in certain situations, such as emergencies, depending on the plan.
What Is a PPO?
PPO stands for Preferred Provider Organization.
PPO plans generally provide more flexibility when choosing health care providers.
You can generally use out-of-network providers, but you may have to pay more.
The exact rules vary between plans.
For a detailed comparison, you can read our upcoming article:
HMO vs. PPO: Understanding the Differences
How Does Health Insurance Cover Preventive Care?
Many health insurance plans cover certain preventive services with no cost-sharing when applicable requirements are met.
Examples can include certain:
Vaccinations
Screening tests
Preventive examinations
Counseling services
However, the exact coverage can depend on the service, provider, plan, and applicable requirements.
It is always a good idea to check your plan before assuming that a particular service will cost nothing.
What Does Health Insurance Cover?
Health insurance coverage depends on the specific plan.
Marketplace health plans include categories of essential health benefits such as:
Doctor and outpatient services
Emergency services
Hospitalization
Pregnancy, maternity, and newborn care
Mental health and substance use disorder services
Prescription drugs
Rehabilitative and habilitative services
Laboratory services
Preventive and wellness services
Pediatric services
The exact benefits, cost-sharing requirements, provider networks, and coverage rules can vary between plans.
This means you should always review the details of a plan before enrolling.
What Are Bronze, Silver, Gold, and Platinum Health Plans?
Marketplace health insurance plans are commonly divided into four metal categories:
Bronze
Silver
Gold
Platinum
These categories generally describe how you and the insurance company share the cost of covered health care.
They do not indicate the quality of medical care.
Generally:
Bronze Plans
Bronze plans tend to have lower monthly premiums but higher costs when you receive covered care.
Silver Plans
Silver plans generally fall between Bronze and Gold in terms of premium and cost-sharing.
Gold Plans
Gold plans generally have higher premiums but lower costs when you receive covered care.
Platinum Plans
Platinum plans generally have the highest premiums and lower costs when you receive covered care.
These are general descriptions. Actual premiums, deductibles, copays, and other costs depend on the specific plan.
How Does the Health Insurance Marketplace Work?
The Health Insurance Marketplace is a place where eligible people can compare and enroll in health insurance plans.
Depending on where you live, you may use the federal Marketplace or a state-based Marketplace.
When comparing plans, you can look at:
Monthly premium
Deductible
Copayments
Coinsurance
Out-of-pocket maximum
Provider network
Prescription coverage
Covered benefits
Plan category
Some people may also qualify for financial assistance.
How Does Health Insurance Financial Assistance Work?
Some people who enroll in Marketplace health insurance may qualify for financial assistance depending on their circumstances.
One form of assistance is a premium tax credit, which can reduce the amount you pay for your monthly health insurance premium.
Some eligible people may also qualify for additional savings that reduce certain out-of-pocket costs.
Eligibility depends on current rules and individual circumstances.
Because eligibility requirements can change, it is important to use current information when applying for Marketplace coverage.
How Do You Pay for Health Insurance?
The way you pay for health insurance depends on how you receive your coverage.
For example, if you purchase Marketplace coverage, you generally pay your monthly premium directly to your insurance company.
If you receive health insurance through your employer, your employer may pay part of the premium while you pay the remaining portion, often through payroll deductions.
The exact arrangement depends on your employer and health plan.
What Happens If You Don't Use Your Health Insurance?
You generally continue paying your monthly premium even if you don't visit a doctor.
However, having health insurance can provide financial protection if something unexpected happens.
You might feel completely healthy today but need emergency treatment or hospitalization later.
Insurance can help reduce the financial impact of covered medical expenses.
This is one of the main reasons people purchase health insurance even when they don't regularly visit doctors.
How Should You Compare Health Insurance Plans?
Choosing a health insurance plan involves more than finding the lowest monthly premium.
Consider the following factors.
1. Monthly Premium
How much will you pay every month?
2. Deductible
How much could you have to pay for applicable covered services before the plan starts sharing costs?
3. Copayments
How much will you pay for common services such as doctor visits or prescriptions?
4. Coinsurance
What percentage of covered services will you have to pay after applicable deductible requirements?
5. Out-of-Pocket Maximum
What is the plan's maximum for applicable covered expenses?
6. Provider Network
Are your preferred doctors and hospitals included?
7. Prescription Coverage
Are your medications covered, and what might they cost?
8. Expected Health Care Needs
Do you expect to need frequent doctor visits, specialist appointments, prescriptions, or other medical services?
Looking at all of these factors can give you a much better picture of the potential overall cost of a health insurance plan.
Common Health Insurance Mistakes to Avoid
Choosing a Plan Based Only on the Premium
A low monthly premium doesn't necessarily mean the plan will cost less overall.
A plan with a lower premium may have a higher deductible or higher cost-sharing when you receive medical care.
Ignoring the Provider Network
A health insurance plan may look attractive until you discover that your preferred doctor or hospital isn't in network.
Not Checking Prescription Coverage
If you take prescription medication regularly, check how the plan handles those medications before enrolling.
Confusing the Deductible With the Out-of-Pocket Maximum
These are two different things.
The deductible is what you generally pay for certain covered services before the insurance company starts sharing costs.
The out-of-pocket maximum is the applicable limit on certain covered expenses during the plan year.
Assuming Everything Is Covered
Health insurance does not necessarily cover every medical service.
Coverage depends on the terms of your plan.
Forgetting to Compare Total Costs
The monthly premium is only one part of the total cost.
You should also consider deductibles, copays, coinsurance, and the out-of-pocket maximum.
Frequently Asked Questions
How does health insurance work in simple terms?
You pay for health insurance coverage, usually through a monthly premium. When you receive covered medical care, you and your insurance company generally share the cost according to the rules of your plan.
Do you pay a monthly fee for health insurance?
Usually, yes. This payment is called the premium. You generally pay the premium even if you don't use medical services during that month.
What happens after I meet my deductible?
After meeting your deductible, your health insurance plan generally begins sharing the cost of covered services according to its rules. You may still have copayments or coinsurance until you reach the applicable out-of-pocket maximum.
What happens when I reach my out-of-pocket maximum?
After you reach the applicable out-of-pocket maximum for covered services, your plan generally pays 100% of covered benefits for the rest of the coverage period, subject to the plan's terms.
Does the out-of-pocket maximum include my monthly premium?
Generally, no. Monthly premiums are usually separate from the out-of-pocket maximum.
Is a deductible the same as a copay?
No.
A deductible is an amount you generally pay for certain covered services before the plan begins sharing costs.
A copay is generally a fixed amount you pay for a covered service.
Is coinsurance the same as a copay?
No.
A copay is generally a fixed dollar amount.
Coinsurance is generally a percentage of the allowed cost of a covered service.
Can I use any doctor with health insurance?
Not necessarily.
Many health insurance plans have provider networks. Depending on your plan, using an out-of-network provider may cost more or may not be covered.
Does health insurance cover preventive care?
Many health plans cover certain preventive services without cost-sharing when applicable requirements are met. The exact coverage depends on the service, plan, provider, and applicable rules.
Can health insurance cover pre-existing conditions?
Marketplace health plans must cover pre-existing conditions and cannot reject you or charge you more because of a pre-existing condition.
Can I get health insurance if I am unemployed?
You may be able to get health insurance through the Marketplace or qualify for programs such as Medicaid, depending on your circumstances and eligibility.
Can I change my health insurance plan at any time?
Not necessarily.
The ability to change plans generally depends on the type of coverage, enrollment period, and whether you qualify for a Special Enrollment Period.
Final Thoughts
Understanding how health insurance works in the USA becomes much easier once you understand the basic cost-sharing system.
The most important terms to remember are:
Premium → Deductible → Copay/Coinsurance → Out-of-Pocket Maximum
But these aren't the only things you should consider.
When comparing health insurance plans, also look at the provider network, prescription coverage, benefits, plan type, and your expected health care needs.
Don't automatically choose a plan simply because it has the lowest monthly premium.
Instead, consider how much the plan could cost you both when you're healthy and when you actually need medical care.
If you're new to health insurance, start with our What Is Health Insurance? A Complete Guide for Beginners guide and then continue exploring the other health insurance topics on our website.
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