The US healthcare system is a hybrid of public programs and private insurance, with no single entity in charge. Unlike most high-income countries that use one national system, the US relies on a patchwork of employers, government agencies, and individual purchases to cover its population. The result: the country spent $5.3 trillion on healthcare in 2024, or about $15,474 per person, consuming 18% of GDP. That’s far more than any other nation, yet American life expectancy sits more than four years below the average of comparable countries.
Who Pays: The Multi-Payer Model
The most distinctive feature of American healthcare is that there is no single payer. Instead, money flows from dozens of sources. Employer-sponsored insurance is the largest, covering 53.8% of the population. Medicare covers 19.1%, Medicaid covers 17.6%, and about 10.7% of people buy coverage directly (often through the Affordable Care Act marketplaces). Military-related programs like TRICARE and VA coverage account for smaller shares. Some people fall into more than one category, and a remaining slice has no coverage at all.
This system evolved over decades rather than being designed from scratch. Employers began offering health benefits during World War II as a way to attract workers when wages were frozen, and that employer-based model stuck. Government programs were layered on top over time: Medicare and Medicaid arrived in 1965, the Children’s Health Insurance Program in 1997, and the ACA marketplace in 2014. The system also includes elements of socialized medicine through the Department of Veterans Affairs, where the government both employs the doctors and pays the bills.
Medicare and Medicaid: The Public Programs
Medicare is the federal program for people 65 and older, along with younger people who have certain disabilities or end-stage kidney disease. It’s funded primarily through payroll taxes and beneficiary premiums. Medicare has multiple parts: hospital coverage, outpatient coverage, and a prescription drug benefit. Despite being a government program, most Medicare beneficiaries still pay premiums, deductibles, and copays, and many purchase supplemental private insurance to fill the gaps.
Medicaid is a joint federal-state program covering low-income Americans, and it works differently in every state. Federal law requires states to cover certain groups: low-income families, pregnant women, children, and people receiving disability benefits. The ACA gave states the option to expand Medicaid to nearly all adults earning up to 133% of the federal poverty level. Children are covered at even higher income thresholds in most states. Altogether, Medicaid and the related Children’s Health Insurance Program cover over 77.9 million people. Eligibility requires US citizenship or qualifying immigration status, and you generally must be a resident of the state where you’re applying.
Private Insurance: Plan Types and Networks
If you get insurance through an employer or buy it on the marketplace, you’ll encounter several plan structures that control where you can get care and how much you’ll pay.
- HMO (Health Maintenance Organization): Limits coverage to doctors and hospitals within the plan’s network. Out-of-network care typically isn’t covered except in emergencies. You may need to live or work in the plan’s service area.
- PPO (Preferred Provider Organization): Lets you see any provider without a referral, but you pay less when you stay in network. Out-of-network care is covered at a higher cost to you.
- EPO (Exclusive Provider Organization): Similar to an HMO in that only in-network care is covered, but you usually don’t need referrals to see specialists.
- POS (Point of Service): A hybrid that requires referrals from a primary care doctor to see specialists but offers some out-of-network coverage at a higher price.
The practical difference comes down to flexibility versus cost. PPOs give you more freedom to choose providers but charge higher premiums. HMOs are often cheaper month to month but restrict your options. Choosing the wrong plan type for your situation can mean surprise bills if you see a doctor outside your network.
What You Actually Pay
Health insurance in the US doesn’t mean free care. You typically pay a monthly premium, an annual deductible (the amount you spend before insurance kicks in), copays for individual visits, and coinsurance (a percentage of costs you share with the insurer). In ACA marketplace plans, the weighted average deductible for 2025 is $3,727, though this varies wildly by plan tier. A Bronze plan averages $7,476 in deductibles while a Gold plan averages $2,912. Lower-income enrollees who qualify for cost-sharing reductions can see deductibles drop dramatically, to as low as $80 for the most generous subsidy level.
All marketplace and employer plans have an annual out-of-pocket maximum, a ceiling on what you can be asked to pay in a year. Once you hit that number, the insurer covers 100% of covered services for the rest of the year. This cap exists to protect people from catastrophic costs, but hitting it can still mean spending thousands of dollars before relief arrives.
Where Care Is Delivered
Hospitals are the backbone of the system, and their ownership structure shapes how care is delivered. About 49.2% of US hospitals are non-profit, meaning they reinvest revenue rather than distributing profits to shareholders. Another 36.1% are for-profit, owned by corporations or investors. The remaining 14.7% are government-owned, including public county hospitals and federal facilities like VA medical centers.
Outside of hospitals, Americans get care from private physician practices, urgent care clinics, community health centers, and increasingly through telehealth visits. Primary care doctors, specialists, and surgeons typically operate as independent businesses or as employees of hospital systems. This fragmentation means your primary care doctor, your lab, your imaging center, and your specialist may all bill separately, through different systems, even for a single health issue.
How Billing Works Behind the Scenes
Every time you receive medical care, the provider translates what happened into a set of standardized codes. Diagnoses get coded using a system called ICD-10, which contains tens of thousands of codes for specific conditions. Procedures are coded separately. These codes are submitted to your insurer as a “claim,” essentially a request for payment. The insurer reviews the claim, decides what’s covered under your plan, applies your deductible and cost-sharing, and sends payment to the provider. Whatever remains becomes your responsibility.
This process, called claims adjudication, is why you often receive care weeks before you see a bill. It’s also why billing errors are common. The coding system is complex, and a wrong code can mean a denied claim or an inflated charge. Patients can and should review their explanation of benefits statements, which show what was billed, what the insurer paid, and what you owe.
Prescription Drug Coverage
Prescription drugs add another layer of cost and complexity. Most insurance plans maintain a “formulary,” a list of drugs they cover, organized into tiers. Generic medications sit on the cheapest tier, while brand-name and specialty drugs cost progressively more out of pocket. If your doctor prescribes something not on the formulary, you may need to request an exception or pay the full price.
A significant recent change is the Inflation Reduction Act, which for the first time allows Medicare to directly negotiate prices on certain high-cost drugs. The first negotiated prices took effect in 2026, targeting drugs with the highest total spending. The Congressional Budget Office estimated savings of $3.7 billion in the first year alone, growing to $17.5 billion by 2028. The law also capped out-of-pocket drug spending for Medicare beneficiaries, a major shift for seniors who previously faced unlimited costs for expensive medications.
Why Costs Are High and Outcomes Lag
The US spends roughly twice as much per person on healthcare as other wealthy nations. Multiple factors drive this: administrative overhead from managing thousands of different insurance plans, higher prices for the same drugs and procedures compared to other countries, and a system that generally pays more for specialized treatments than for preventive care. Hospitals, insurers, and pharmaceutical companies each operate as businesses with their own financial incentives, and those incentives don’t always align with keeping people healthy at the lowest cost.
Despite this spending, the US has the highest rates of preventable and treatable deaths among comparable countries, according to a 2024 Commonwealth Fund analysis of ten high-income nations. Life expectancy trails the group average by more than four years. The gap reflects not just the healthcare system itself but the uneven access it creates. People with good employer coverage often receive world-class care, while those who are uninsured or underinsured may delay treatment until conditions become emergencies.
The fragmented structure also means there’s no single authority coordinating care across providers. Your cardiologist may not know what your endocrinologist prescribed, and neither may have access to the records from the urgent care clinic you visited last month. Electronic health records have improved this somewhat, but interoperability between systems remains inconsistent.