Medical care in the United States can be expensive, especially when you need hospital treatment, prescription medications, specialist care, or ongoing treatment for a health condition. Health Insurance is designed to help people manage these medical costs by sharing eligible healthcare expenses between the insured person and the health plan. However, having health insurance does not mean that every medical bill is automatically paid by the insurance company. Your plan may include a monthly premium, deductible, copayments, coinsurance, an out-of-pocket maximum, provider-network rules, and exclusions. Understanding these terms before choosing a plan can make it much easier to estimate what healthcare may cost you.
This beginner’s guide explains how health insurance works in the United States, the main types of coverage, common insurance terms, how you generally pay for care, and what to consider when comparing health plans.
What Is Health Insurance?
Health insurance is a type of coverage that helps pay for eligible healthcare services and medical expenses according to the terms of an insurance plan. You generally pay a premium to maintain your coverage. When you receive covered healthcare services, you may also have to pay other costs, such as a deductible, copayment, or coinsurance. The health plan then pays its share of covered expenses according to the plan’s rules. Health insurance can help protect you from having to pay the full cost of covered medical care yourself.
How Health Insurance Shares Costs
Health insurance usually involves some form of cost sharing between you and the insurance company. For example, a plan might require you to:
- Pay a monthly premium
- Pay a deductible for certain covered services
- Pay a copayment for certain healthcare services
- Pay coinsurance after meeting your deductible
- Pay eligible costs until you reach the plan’s out-of-pocket maximum
The exact combination depends on the health plan. HealthCare.gov explains that when comparing Marketplace plans, consumers should consider total yearly costs rather than looking only at the monthly premium.
How Does Health Insurance Work?
The basic idea is relatively simple. You purchase or receive health coverage through a source such as an employer, the Health Insurance Marketplace, Medicare, Medicaid, or another qualifying program or arrangement. You then pay any required premium to maintain the coverage. When you need medical care, you generally use providers and services covered by your plan. Depending on the service and your plan’s rules, you may pay part of the cost while your insurance company pays its share.
Your costs can depend on:
- Whether the service is covered
- Whether the provider is in your plan’s network
- Whether you have met your deductible
- Your copayment or coinsurance
- Your remaining out-of-pocket maximum
- The plan’s negotiated or allowed amount
- Whether the service requires prior authorization
A Simple Example
Imagine you have a health plan with:
- Monthly premium: $350
- Annual deductible: $2,000
- Coinsurance: 20%
- Out-of-pocket maximum: $6,500
You may pay your monthly premium whether or not you use medical services. For certain covered healthcare expenses, you may first have to pay costs toward your deductible. After meeting the deductible, you may pay a percentage of the allowed cost through coinsurance until reaching the out-of-pocket maximum. This is a simplified example. Actual plan rules can differ significantly.
What Is a Health Insurance Premium?
A health insurance premium is the amount you pay for your health coverage, usually every month. You generally have to pay the premium to keep the policy active, even if you do not visit a doctor or use medical services during that month. HealthCare.gov defines the premium as the amount paid each month for health insurance and notes that Marketplace enrollees may qualify for financial assistance that reduces the premium.
Does a Premium Cover All Medical Costs?
No. Paying your premium does not necessarily mean that all healthcare services are free. You may still have to pay deductibles, copayments, coinsurance, or other eligible expenses depending on your plan. This is why comparing only monthly premiums can give you an incomplete picture of what a health plan may cost.
What Is a Health Insurance Deductible?
A health insurance deductible is the amount you may have to pay for certain covered healthcare services before your plan begins paying its share. For example, if your deductible is $2,000, you may have to pay $2,000 in eligible expenses before the plan begins paying according to its cost-sharing rules for services subject to the deductible. However, not every service necessarily has to wait until you meet the deductible. Certain plans cover some services before the deductible, and Marketplace plans cover certain preventive benefits without cost sharing when applicable.
Deductible Example
Suppose your plan has a $1,500 deductible. You receive $1,000 in eligible services that are subject to the deductible. You may have to pay that $1,000 yourself. Later, you receive another $1,000 in eligible services subject to the deductible. After paying the remaining $500 needed to meet your deductible, your plan may begin sharing costs according to its copayment or coinsurance rules. The exact calculation depends on the plan.
What Is a Health Insurance Copayment?
A copayment, often called a copay, is a fixed amount you pay for a covered healthcare service when your plan requires one. For example, a plan could require a $30 copayment for a primary-care visit. Another service might have a different copayment. HealthCare.gov describes a copayment as a fixed amount paid for a plan-covered service, such as a doctor visit.
Are Copays Always the Same?
No. A health plan can have different copay amounts for different services. For example, a plan might have separate cost-sharing amounts for:
- Primary-care visits
- Specialist visits
- Urgent care
- Emergency room services
- Prescription drugs
Check the plan’s Summary of Benefits and Coverage for the specific amounts.
What Is Coinsurance?
Coinsurance is generally the percentage of an allowed or covered healthcare cost that you pay after meeting applicable deductible requirements. For example, if your plan has 20% coinsurance, you may pay 20% of the applicable cost while the health plan pays the remaining 80%, subject to the plan’s terms. HealthCare.gov provides an example in which a person with a 20% coinsurance rate pays $25 of a $125 covered office visit after meeting the applicable deductible.
Copay vs. Coinsurance
| Copayment | Coinsurance |
|---|---|
| Usually a fixed dollar amount | Usually a percentage of the applicable cost |
| Example: $30 for a covered visit | Example: 20% of an allowed amount |
| Amount can vary by service | Amount can change depending on the cost of the service |
What Is an Out-of-Pocket Maximum?
The out-of-pocket maximum is a limit on what you pay for covered services during a plan year, subject to the plan’s rules. After you reach the applicable out-of-pocket maximum for covered services, the health plan generally pays 100% of covered benefits for the remainder of the plan year when the applicable requirements are met. HealthCare.gov explains that premiums, services the plan does not cover, and certain out-of-network expenses generally do not count toward the Marketplace out-of-pocket limit.
Why the Out-of-Pocket Maximum Matters
The out-of-pocket maximum can provide protection against extremely high eligible healthcare costs. For example, if a plan has a $6,000 out-of-pocket maximum, you may have significant cost-sharing expenses before reaching that limit, but once the applicable maximum is reached, the plan generally pays 100% of covered benefits for the rest of the plan year. The specific expenses that count toward the limit depend on the plan.
Premium vs. Deductible vs. Copay vs. Coinsurance
These four terms are among the most important concepts to understand when comparing health insurance.
| Term | What It Generally Means |
|---|---|
| Premium | The amount you pay for health coverage, usually monthly. |
| Deductible | The amount you may pay for certain covered services before the plan starts paying its share. |
| Copayment | A fixed amount you pay for a covered service. |
| Coinsurance | A percentage of the applicable cost you pay for a covered service. |
| Out-of-pocket maximum | The limit on what you pay for covered services during a plan year, subject to the plan’s rules. |
HealthCare.gov recommends considering all of these costs when comparing plans rather than focusing only on the premium.
What Does Health Insurance Cover?
What a health plan covers depends on the type of coverage, plan design, applicable law, and policy terms. Marketplace health plans must cover essential health benefits, which include categories such as hospital care, prescription drugs, maternity and newborn care, mental health and substance use disorder services, and preventive and wellness services, subject to applicable rules. Other health insurance arrangements can have different coverage structures.
Examples of Healthcare Services That May Be Covered
- Doctor visits
- Hospital services
- Emergency care
- Prescription medications
- Preventive services
- Laboratory services
- Maternity and newborn care
- Mental health services
- Rehabilitation services
- Specialist care
Whether a specific service is covered, and how much you pay for it, depends on your plan.
What Does Health Insurance Usually Not Cover?
Health insurance does not necessarily cover every medical or healthcare-related expense. Plans can contain exclusions, limitations, network rules, medical-necessity requirements, and other conditions. Examples of expenses that may be excluded or limited can include certain cosmetic procedures, services considered not medically necessary under the plan, or care outside the plan’s coverage rules.
Do not assume that a service is covered simply because it is related to healthcare.
Always Check the Plan Documents
The Summary of Benefits and Coverage and other plan documents can help you understand covered services, cost sharing, limitations, and exclusions. If you are unsure whether a treatment is covered, contact the health plan before receiving the service when possible.
What Are Health Insurance Provider Networks?
A provider network is a group of doctors, hospitals, pharmacies, and other healthcare providers that have an agreement with a health insurance plan. Using an in-network provider can result in different costs and coverage compared with using an out-of-network provider. CMS explains that health insurance companies often contract with provider networks and that plans can differ in their provider networks, cost-sharing arrangements, and benefits.
Why Does the Network Matter?
Suppose you choose a health plan because its premium looks affordable but later discover that your preferred doctor is not in the plan’s network. You may have to change doctors, pay more for certain services, or face different coverage rules depending on the plan. Before choosing a plan, check whether your preferred doctors, hospitals, and pharmacies participate in its network.
What Is an In-Network Provider?
An in-network provider generally has a contractual relationship with your health plan. Your plan may provide more favorable cost-sharing for covered care received from in-network providers. The exact rules depend on the type of health plan.
What Is an Out-of-Network Provider?
An out-of-network provider generally does not have the same contractual relationship with your plan. Depending on the plan, using an out-of-network provider can result in higher costs or no coverage for certain services. Some plans provide limited out-of-network coverage, while others may generally require you to stay within the network except in certain situations.
What Are the Main Types of Health Insurance?
People in the United States can obtain health coverage through several different sources and programs. Common categories include:
- Employer-sponsored health insurance
- Individual and family health insurance
- Marketplace health insurance
- Medicare
- Medicaid
- Children’s Health Insurance Program (CHIP)
- Other qualifying health coverage arrangements
CMS identifies employer-sponsored coverage, Marketplace coverage, Medicare, Medicaid, CHIP, and certain other programs among categories that can qualify as minimum essential coverage under federal rules.
Employer-Sponsored Health Insurance
Many workers receive health insurance through an employer. In an employer-sponsored arrangement, the employer may pay some portion of the premium while the employee pays the remaining portion, depending on the employer’s benefits structure. The plan may also include deductibles, copayments, coinsurance, provider networks, and other cost-sharing requirements.
Individual and Family Health Insurance
People who do not receive suitable employer-sponsored coverage may purchase individual or family health insurance. Depending on eligibility and where you live, this may involve the federal Health Insurance Marketplace or a state-based Marketplace.
Medicare
Medicare is a federal health insurance program with different parts and coverage options. It is different from an individual Marketplace plan and has its own eligibility and enrollment rules.
Medicaid and CHIP
Medicaid provides health coverage for eligible individuals under federal and state rules. CHIP provides coverage for eligible children in families that meet program requirements. Eligibility, benefits, and program administration can vary by state.
What Are HMO, PPO, EPO, and POS Plans?
Health insurance plans can also differ by how they organize provider networks and access to care. Some common plan structures include:
- HMO: Health Maintenance Organization
- PPO: Preferred Provider Organization
- EPO: Exclusive Provider Organization
- POS: Point of Service
These plan types can have different rules concerning provider networks, referrals, out-of-network care, and cost sharing. We will examine these differences in detail in upcoming PolicyHelpUSA Health Insurance articles.
What Are Bronze, Silver, Gold, and Platinum Health Plans?
Marketplace health plans are grouped into four metal categories:
- Bronze
- Silver
- Gold
- Platinum
These categories generally describe how you and the plan share the cost of covered healthcare rather than the quality of medical care. HealthCare.gov specifically states that the four metal categories show how consumers and plans share costs and are not a measure of quality of care.
Why Metal Categories Matter
When comparing Marketplace plans, the metal category can give you a general idea of the relationship between premiums and cost sharing. However, you should still compare the actual deductible, copayments, coinsurance, out-of-pocket maximum, provider network, prescription coverage, and other plan details.
How Much Does Health Insurance Cost?
There is no single health insurance price for everyone. The amount you pay can depend on factors such as:
- The type of plan
- Where you live
- Your age
- Whether you cover only yourself or a family
- The insurance company
- The plan’s deductible and cost-sharing structure
- Whether you qualify for financial assistance
- The coverage source
For Marketplace coverage, eligible consumers may qualify for premium tax credits that reduce monthly premiums. CMS’s 2026 Marketplace information shows that costs and financial assistance can vary significantly, so consumers should check their actual eligibility and available plans rather than relying on a general national price.
Premium Is Not Your Total Healthcare Cost
A plan with a low monthly premium may have a higher deductible or other out-of-pocket costs. A plan with a higher premium may have lower costs when you receive care. This is why HealthCare.gov recommends comparing estimated total yearly costs instead of looking only at the premium.
What Is the Health Insurance Marketplace?
The Health Insurance Marketplace is a system through which eligible individuals and families can compare and enroll in qualifying health plans. The Affordable Care Act created Health Insurance Marketplaces as a way for consumers to compare private health insurance options. Some states operate their own Marketplaces, while other states use the federally facilitated Marketplace. CMS maintains information about state-based exchanges and Marketplace operations.
Where Can You See Marketplace Plans?
HealthCare.gov provides a tool where consumers can preview 2026 plans and estimated prices. Final prices and eligibility depend on the application and individual circumstances. If you live in a state that operates its own Marketplace, you may be directed to that state’s Marketplace.
What Is a Health Insurance Plan’s Summary of Benefits and Coverage?
The Summary of Benefits and Coverage, often called the SBC, is a standardized document designed to help consumers understand important features of a health plan. It can help you compare plans by showing information about deductibles, copayments, coinsurance, covered services, exclusions, and other cost-sharing details. CMS provides resources specifically designed to help consumers and Marketplace assisters understand and compare plan information, including the Summary of Benefits and Coverage.
How Do You Choose a Health Insurance Plan?
Choosing a health plan involves more than finding the lowest premium. Consider how often you expect to use healthcare and what types of medical services you may need.
Check Your Doctors
If you already have doctors you trust, check whether they participate in the plan’s network.
Check Your Prescription Drugs
If you take regular medications, check whether the plan covers those medications and what your expected cost may be.
Compare the Deductible
A lower deductible can mean less spending before the plan begins sharing certain costs, but it may come with a higher premium.
Compare the Out-of-Pocket Maximum
The out-of-pocket maximum can be especially important if you expect significant medical care during the year.
Estimate Your Total Yearly Cost
Consider the premium together with the deductible, copayments, coinsurance, and potential out-of-pocket costs.
HealthCare.gov provides tools that allow consumers to compare estimated total yearly costs for Marketplace plans based on expected healthcare use.
What Is Preventive Care in Health Insurance?
Preventive care generally refers to healthcare intended to help prevent illness or identify health problems early. Marketplace plans cover certain preventive services without cost sharing when the applicable requirements are met. HealthCare.gov notes that certain preventive benefits are covered before the deductible under Marketplace plans. The exact services and requirements depend on applicable federal rules and the plan.
What Happens If You Need Expensive Medical Care?
This is one of the situations where understanding your plan’s cost-sharing structure becomes especially important. Suppose you need a major procedure that results in substantial covered medical expenses. You may first pay amounts toward your deductible. After that, you may pay copayments or coinsurance according to the plan until you reach the applicable out-of-pocket maximum. Once the applicable out-of-pocket maximum is reached, the plan generally pays 100% of covered benefits for the remainder of the plan year, subject to the plan’s terms.
What the Out-of-Pocket Maximum Does Not Mean
The out-of-pocket maximum does not necessarily mean you will never have another healthcare expense. Premiums generally do not count toward the out-of-pocket maximum. Expenses for services the plan does not cover and certain out-of-network costs may also be outside the limit.
What Is an Allowed Amount?
An allowed amount is the maximum amount a health plan will use for a covered service when determining its payment and your cost sharing, subject to the plan’s rules. It can also be referred to as an eligible expense, payment allowance, or negotiated rate. The allowed amount can be especially important when understanding coinsurance and provider-network costs.
What Should You Check Before Enrolling in Health Insurance?
Before choosing a plan, make a checklist of the features that matter most to you.
- Monthly premium
- Annual deductible
- Copayments
- Coinsurance
- Out-of-pocket maximum
- Doctor network
- Hospital network
- Prescription drug coverage
- Specialist requirements
- Emergency care rules
- Preventive care coverage
- Prior authorization requirements
- Plan exclusions and limitations
Looking at these details together can give you a much clearer picture of how a plan may work for your situation.
Common Health Insurance Mistakes to Avoid
Choosing Only by Monthly Premium
A low premium does not necessarily mean the plan will have the lowest total cost for your healthcare needs.
Ignoring the Provider Network
A plan may look attractive until you discover that your preferred doctor or hospital is not included in the network.
Not Checking Prescription Coverage
If you regularly take medication, review the plan’s drug coverage before enrolling.
Not Understanding the Deductible
Know which services are subject to the deductible and which may have different cost-sharing rules.
Ignoring the Out-of-Pocket Maximum
Consider how much you could potentially have to pay for covered care during a plan year.
Assuming Every Medical Service Is Covered
Coverage depends on the plan. Always review the plan documents and ask questions about services that are important to you.
Frequently Asked Questions About Health Insurance
What is health insurance in simple terms?
Health insurance is coverage that helps pay for eligible healthcare expenses according to the rules of a health plan. You generally pay a premium and may also share costs through deductibles, copayments, coinsurance, and other expenses.
Why do people need health insurance?
Health insurance can help protect people from having to pay the full cost of covered medical care themselves. It can be particularly important when healthcare expenses become substantial.
What is a health insurance premium?
A premium is the amount you pay for your health coverage, usually each month.
What is a health insurance deductible?
A deductible is the amount you may have to pay for certain covered healthcare services before your plan begins paying its share, subject to the plan’s rules.
What is a copay?
A copay is generally a fixed amount you pay for a covered healthcare service.
What is coinsurance?
Coinsurance is generally a percentage of the applicable cost of a covered healthcare service that you pay after meeting applicable deductible requirements.
What is an out-of-pocket maximum?
An out-of-pocket maximum is the limit on what you pay for covered services during a plan year, subject to the plan’s rules and exclusions.
Does health insurance cover every medical expense?
No. Coverage depends on the plan. Exclusions, limitations, provider networks, medical-necessity requirements, and other conditions can affect whether a service is covered.
Is health insurance mandatory in the United States?
Federal rules regarding health coverage and state requirements can differ, and some states have their own health coverage requirements. The rules can also change, so check the current requirements that apply to your state and circumstances.
What is the Health Insurance Marketplace?
The Health Insurance Marketplace is a system where eligible consumers can compare and enroll in qualifying health plans. Depending on the state, consumers may use HealthCare.gov or a state-based Marketplace.
What is the difference between HMO and PPO insurance?
HMO and PPO plans can differ in their provider networks, referral requirements, out-of-network coverage, and cost-sharing rules. The specific features depend on the plan.
What is the best health insurance plan?
There is no single health insurance plan that is right for everyone. Your healthcare needs, doctors, prescriptions, budget, location, and expected medical expenses all affect which plan features may matter to you.
How PolicyHelpUSA Can Help
Health insurance can seem complicated because several different terms and costs work together. At PolicyHelpUSA, our goal is to make U.S. insurance information easier to understand through practical, reader-focused guides. Our upcoming Health Insurance resources will explain topics such as deductibles, copayments, coinsurance, out-of-pocket maximums, HMO and PPO plans, health insurance costs, Marketplace coverage, enrollment periods, claims, and claim appeals. As you compare health insurance, use your official plan documents and current government resources to confirm the rules that apply to your specific coverage.
