How health insurance works in the US

If you are moving to the United States to work, study, or live permanently, you will quickly discover that health insurance works very differently than in many other countries. There is no NHS-style national health system; instead, health coverage is obtained through one of four main routes, and understanding which one applies to you is essential to protecting your health and finances.

The Four Routes to Health Insurance

Almost everyone in the US is covered through one of these pathways: employer-sponsored insurance, the government Marketplace, public programmes (Medicaid or Medicare), or a student-specific plan. Your route depends on your employment status, income, age, and visa category.

Employer-Sponsored Insurance

Employer-sponsored insurance is the most common type of coverage in the US. About 54% of Americans are covered this way, and it is the norm for anyone working full-time or many part-time roles. If your employer offers health insurance, you will usually be able to enrol during a specific enrollment period, often when you start your job or once per year during the company's open enrollment window.

Here's how the cost is typically split: your employer pays a share of the monthly premium (often 60% or more), and you pay the remainder through automatic deductions from your paycheck. This is one reason employer plans are often more affordable than buying insurance on your own. The employer may offer you a choice of plans—perhaps an HMO (Health Maintenance Organization) with lower out-of-pocket costs, a PPO (Preferred Provider Organization) with more flexibility to see doctors outside a network, or a high-deductible plan paired with a tax-advantaged Health Savings Account (HSA).

The premium is only part of what you pay. You will also encounter cost-sharing when you actually use healthcare. A deductible is the amount you must pay out-of-pocket for most medical services before your insurance begins paying anything. The average deductible for single coverage is about $1,787. A copay is a fixed amount you pay at the time of service—for example, $25 to see your primary care doctor. Coinsurance is a percentage of the cost you share with the insurance company after you have met your deductible; for instance, you might pay 20% of the bill for a specialist visit while the insurer pays 80%. There is also an out-of-pocket maximum: once you reach this annual limit, your insurance covers 100% of eligible costs for the rest of that year.

The Government Marketplace

If you do not have access to employer insurance—because you are self-employed, between jobs, or starting a business—you can buy coverage directly through the government Marketplace (Healthcare.gov in most states, or a state-specific marketplace in a few states like California or New York). The Marketplace is a website where you compare and enrol in private health plans.

Open Enrollment Period, when most people can sign up, runs from November 1 to January 15 each year. If you enrol by mid-December, your coverage begins January 1 of the following year; if you enrol later, coverage starts February 1. If you miss the deadline and do not have a qualifying life event—such as moving, losing a job, getting married, or having a baby—you cannot enrol again until the next open enrollment period. Qualifying life events can trigger a Special Enrollment Period that lasts roughly 60 days, so keep documentation of major changes.

Marketplace plans come in standardized tiers: Bronze, Silver, Gold, and Platinum. Bronze plans have the lowest monthly premium but the highest deductibles and out-of-pocket costs—you pay more when you need care. Platinum plans reverse this: higher premiums, but much lower deductibles and copays. Silver plans are popular because they offer financial assistance through premium tax credits and cost-sharing reductions if your income is below certain thresholds.

If you are a permanent resident (green card holder) or citizen and your household income is below 400% of the federal poverty level, you may qualify for subsidies that lower your monthly premium. These credits are administered through your tax return each year, so it is critical to report any income changes to Healthcare.gov to avoid overpayments or underpayments.

Medicaid and Medicare

Medicaid and Medicare are public insurance programmes created in 1965. Medicare is for people aged 65 and over and for certain people under 65 with disabilities. Medicaid is for people with limited incomes. Each is funded mainly through federal and state revenue.

Whether you qualify for Medicaid depends on your state, household income, and family size. Eligibility rules vary significantly from state to state—some states have expanded Medicaid to cover more low-income adults, while others have stricter limits. If you think you might qualify based on income, you can apply through Healthcare.gov or directly through your state Medicaid agency. If you lose Medicaid or CHIP (Children's Health Insurance Program) coverage, you typically have 60 days to enrol in Marketplace coverage, which is a qualifying life event.

Student Plans

If you are an international student on an F-1 or J-1 visa, your university almost certainly requires you to have health insurance before you begin classes. While the federal government does not mandate it for F-1 students, institutions typically set their own requirements. Your school may enrol you automatically in its own student health plan and bill the cost to your student account, or it may allow you to purchase a plan that meets the school's minimum standards from a third-party provider. Common student insurance providers include ISO (International Student Organization) and Compass Student Health, both of which allow you to purchase coverage online before you arrive in the US. Your plan must typically include a policy maximum of at least $50,000 and a low deductible (often under $500 per incident). Check your school's specific requirements, as they vary.

Key Terms and How Costs Add Up

Understanding the language of US health insurance is crucial. Every plan has four main cost components:

• Premium: The monthly fee to keep your insurance active. With employer insurance, this is split between you and your employer. With Marketplace or individual plans, you pay the full amount unless you qualify for subsidies.
• Deductible: The amount you must pay out-of-pocket before your insurance pays anything. Common deductibles range from $500 to $3,000 or higher. Once you meet it, your insurance starts sharing costs.
• Copay: A fixed dollar amount you pay when you use a service, such as $25 for a doctor visit or $15 for a prescription. Some plans have no copays until you meet the deductible.
• Coinsurance: After you meet your deductible, you often split the remaining cost with your insurer—for example, you pay 20%, they pay 80%.
• Out-of-pocket maximum: The most you will pay in premiums, deductibles, copays, and coinsurance in a year. Once reached, the insurer covers 100% of eligible costs for the rest of that year.

Staying Uninsured: Legal but Dangerous

There is no federal penalty for not having health insurance as of 2024. However, five states and Washington DC impose their own tax penalties on uninsured residents: California, Massachusetts, New Jersey, Rhode Island, and Washington DC. Penalties range from $450 per person (California) to over $1,900 per year (Massachusetts). If you live in most other states, you will not face a legal penalty for being uninsured.

That said, being uninsured is financially dangerous even where it is legal. A single emergency room visit, surgery, or serious illness can cost thousands of dollars. Without insurance, you are responsible for 100% of the bill. A routine appendectomy, emergency care, or a week in hospital can easily reach $10,000 to $50,000 or more. Medical debt is one of the leading causes of personal bankruptcy in the US, and unpaid medical bills can damage your credit score for years, affecting your ability to rent an apartment, buy a car, or obtain credit.

Getting Started: What You Will Need

To enrol in a health plan, you will typically need one or more of the following:

• A Social Security Number (SSN) if you are a permanent resident or citizen. If you have an Individual Taxpayer Identification Number (ITIN) instead because you do not yet have an SSN, some Marketplace plans may still accept it.
• Proof of lawful presence: a green card (permanent resident card), visa stamp, or USCIS documentation.
• Your income information for the current year, ideally from recent pay stubs or tax filings (IRS Form 1040, W-2 for employees, or 1099 for self-employed workers).
• Information about any other health coverage you or your dependents have (for example, if a spouse has employer coverage).

Many employers automatically enrol eligible employees in the company health plan; check with your HR department about the timeline. For Marketplace coverage, create an account on Healthcare.gov and complete an application. You will be asked about your citizenship or immigration status, income, household size, and current coverage. Based on this information, the Marketplace will estimate your eligibility for premium tax credits and cost-sharing reductions.

Employer Coverage and Your Rights

If your employer offers health insurance, there are a few important rules to know. Under federal law, you cannot be denied coverage or charged more based on pre-existing medical conditions. Employers must also allow you to keep your adult children on your plan until they turn 26, even if they are not students or living with you. If your employer is large enough (50 or more full-time employees), they must offer coverage or face penalties.

When you receive your pay stub, your health insurance premium will be deducted before taxes (in most cases), which provides a small tax benefit—you do not pay income tax on the premium amount. If you leave your job, you typically have 60 days to elect COBRA coverage, which extends your employer insurance temporarily (usually for 18 months) at full cost. However, COBRA is expensive because you pay both the employer and employee share, plus an administration fee. The Marketplace is often a more affordable alternative, and you can enrol immediately without waiting for open enrollment.

State Variations: Know Your Rules

Because the US has a federal system with significant state autonomy, health insurance rules—particularly for Medicaid—vary by state. There is no single rule that applies everywhere. For example, some states have expanded Medicaid to cover adults with incomes up to 138% of the federal poverty level, while others cover only the very poorest households. Some states have their own health insurance marketplaces with different rules and deadlines; others use the federal Healthcare.gov system.

Before you make any insurance decisions, check your specific state's rules. You can do this by visiting Healthcare.gov (which will direct you to your state's resources), contacting your state Medicaid office, or calling the national hotline at 1-800-318-2596. If you relocate to a different state, your health insurance situation may change, and you may need to select a new plan.

Navigating Your First Year

Your first year insured in the US may feel overwhelming. Health plans are complex, networks vary, and costs are not always transparent upfront. Here are a few practical steps to take control:

• Choose a primary care doctor (PCP) before you need one. Many plans require a PCP referral before you can see a specialist. Your plan's website or member app will show you which doctors are in-network.
• Understand your network. In-network doctors and hospitals have agreements with your insurer and usually cost less. Out-of-network providers cost significantly more. Always check the network before scheduling care.
• Use preventive care. Most plans cover preventive services (like annual checkups, screening tests, and vaccinations) at no cost before you meet your deductible.
• Keep copies of your insurance card and member ID in your phone and wallet. You will need these at every medical visit.
• Review your plan's formulary (the list of covered medications) if you take prescription drugs. Some medications have high copays or require prior authorization from your insurer before your doctor can prescribe them.

When and How to Get Help

If you feel confused or stuck, free assistance is available. Healthcare.gov has trained enrollment counsellors called Navigators and Certified Application Counsellors (CACs) who can help you understand your options, enrol in a plan, and check if you qualify for financial help. You can find a counsellor near you through Healthcare.gov or by calling 1-800-318-2596. Many community health centers and non-profit organizations also offer free help.

If you are an international student, your school's international student office is your first resource. They can clarify your insurance requirements, help you waive the school plan if you prefer your own, and connect you with student-specific insurers. Do not delay—insurance must typically be in place before classes begin.

Health insurance in the US is a crucial investment in your wellbeing and financial security. Understanding which route is available to you, what you will pay, and what is covered takes time but is worth the effort. Once you have coverage in place, you can focus on settling into your new life without the fear of a single health emergency wiping out your savings.