Understanding the U.S. Healthcare System
Health coverage in the United States comes from several different sources. The right option depends on factors such as age, employment, household income, state of residence, disability status, and access to employer-sponsored benefits. Understanding how the main programs work can make it easier to compare coverage and avoid enrollment gaps.
Main Ways People Get Health Coverage
Employer-Sponsored Insurance
Many people receive coverage through an employer or a family member’s employer. Employers often contribute toward premiums, but employees should still compare deductibles, provider networks, prescriptions, copays, coinsurance, and the yearly out-of-pocket maximum.
Health Insurance Marketplace
The Affordable Care Act Marketplace offers individual and family plans. Marketplace applications also determine whether a household may qualify for premium tax credits, cost-sharing reductions, Medicaid, or the Children’s Health Insurance Program. Premium tax credits are available only with eligible Marketplace coverage, not plans purchased directly outside the Marketplace.
Medicare
Medicare is federal health insurance primarily for people age 65 and older and for some younger people with qualifying disabilities or conditions. Original Medicare includes Part A for hospital coverage and Part B for medical coverage. Part D helps cover prescription drugs. Medicare Advantage, also called Part C, is an alternative offered by Medicare-approved private plans and generally bundles Part A, Part B, and often Part D. Medigap policies can help with certain out-of-pocket costs for people who use Original Medicare.
Medicaid and CHIP
Medicaid and the Children’s Health Insurance Program are jointly funded federal and state programs. Eligibility and benefits vary by state and coverage group. Federal rules require states to cover certain groups, while states may choose additional coverage. In states that adopted the ACA adult expansion, qualifying adults are generally covered up to 138% of the federal poverty level after the standard income disregard.
Private and Small-Business Coverage
Individuals may also compare private plans sold outside the Marketplace, although income-based Marketplace tax credits cannot be used with those plans. Small employers—generally those with 1–50 employees—may be able to offer SHOP coverage or consider other employer arrangements.
What Marketplace Plans Cover
Marketplace plans cover the Affordable Care Act’s ten essential health benefit categories, including outpatient care, emergency services, hospitalization, maternity and newborn care, mental health and substance use disorder services, prescription drugs, rehabilitation, laboratory services, preventive care, and pediatric services. Exact covered services, provider networks, and cost sharing can still differ by plan.
2026 Marketplace Savings
The additional pandemic-era Marketplace savings ended on December 31, 2025. For 2026 coverage, premium tax credits generally return to the standard income range of 100%–400% of the federal poverty level, subject to the full eligibility rules. This means some households may pay more than they did in 2025.
Premium tax credits reduce monthly premiums. Cost-sharing reductions can lower deductibles, copayments, and coinsurance, but those extra savings apply only when an eligible person enrolls in a Silver Marketplace plan. Because advance premium tax credits are reconciled on the federal tax return, households should promptly report changes in income, household size, address, or access to other coverage.
Enrollment Periods
For 2026 coverage, HealthCare.gov Open Enrollment ran from November 1, 2025 through January 15, 2026. Outside Open Enrollment, a person generally needs a qualifying life event—such as losing qualifying coverage, marriage, birth, adoption, or certain moves—to use a Special Enrollment Period. Supporting documents may be required.
Beginning with plan year 2027, the federal HealthCare.gov Open Enrollment period is scheduled for November 1 through December 15. State-based Marketplaces may use different dates within federal requirements, so consumers should verify deadlines for their state each year.
How to Compare Plans
Look beyond the monthly premium and review:
- Deductibles and the annual out-of-pocket maximum
- Copays and coinsurance for frequently used services
- Doctors, hospitals, pharmacies, and specialists in the network
- Prescription formularies, tiers, and prior authorization rules
- Referral requirements and out-of-network coverage
- Expected total yearly costs based on anticipated healthcare use
Official Resources
Rules and deadlines can change. Use these official federal resources for the latest information: