ACA health insurance refers to any health plan that meets the standards set by the Affordable Care Act, the 2010 federal law that reshaped how Americans buy and use health coverage. These plans must cover a defined set of medical services, cannot turn you away for pre-existing conditions, and often come with financial help that lowers your monthly costs. Most people encounter ACA insurance through the Health Insurance Marketplace, the government-run shopping platform where individuals and families compare and purchase plans.
What Every ACA Plan Must Cover
All ACA-compliant plans sold through the Marketplace are required to include 10 categories of essential health benefits. This was a significant shift from the pre-2014 insurance market, where plans could exclude entire types of care. The required categories are:
- Outpatient care: doctor visits and procedures that don’t require a hospital stay
- Emergency services
- Hospitalization: surgeries and overnight stays
- Pregnancy, maternity, and newborn care
- Mental health and substance use treatment: including counseling and psychotherapy
- Prescription drugs
- Rehabilitative services and devices: helping people recover skills after injuries or manage disabilities
- Laboratory services
- Preventive and wellness services
- Pediatric services: including dental and vision care for children (though adult dental and vision are not required)
Beyond these categories, ACA plans must also provide certain preventive services at zero cost to you, with no copay or deductible. These include blood pressure, diabetes, and cholesterol screenings; cancer screenings like mammograms and colonoscopies; routine vaccinations; flu shots; well-baby and well-child visits; and counseling for things like quitting smoking or managing depression. The specific services available to you depend on your age and sex.
Key Consumer Protections
Before the ACA, insurance companies could deny you coverage, charge you more, or exclude treatment for health problems you already had. That’s no longer legal. Insurers cannot refuse coverage or raise your premium because of a pre-existing condition like asthma, diabetes, cancer, or pregnancy. Once you’re enrolled, they also cannot limit benefits or refuse to cover treatment for any condition you had before your coverage started.
Another major protection: if you have children, your plan must allow them to stay on your insurance until they turn 26. This applies whether your child is married or unmarried, living with you or not, and it covers both individual market plans and employer-sponsored plans.
Bronze, Silver, Gold, and Platinum Plans
ACA Marketplace plans are grouped into four tiers, sometimes called metal levels. The tier tells you how costs are split between you and the insurance company, on average, across a year of care:
- Bronze: the plan covers about 60% of costs, you pay 40%. Monthly premiums are the lowest, but deductibles are high.
- Silver: the plan covers about 70%, you pay 30%. Premiums and deductibles fall in the middle.
- Gold: the plan covers about 80%, you pay 20%. Premiums are higher, deductibles are low.
- Platinum: the plan covers about 90%, you pay 10%. Premiums are the highest, deductibles are low.
These percentages reflect averages across all members on that plan type, not a guarantee for any single visit. A Bronze plan might work well if you’re generally healthy and want lower monthly bills. Gold or Platinum plans tend to cost more each month but save you money when you actually use care frequently.
How Financial Help Works
The ACA created two main types of financial assistance to make coverage more affordable. Both are based on your household income relative to the federal poverty level (FPL).
The first is the premium tax credit, which directly reduces your monthly premium. You qualify if your household income falls between 100% and 400% of the federal poverty level. For 2025, that means an individual earning between roughly $15,650 and $62,600, or a family of four earning between $32,150 and $128,600. The credit works on a sliding scale: the lower your income within that range, the larger your discount. You can apply the credit to your monthly bill right away rather than waiting to claim it on your taxes.
The second form of help is cost-sharing reductions, which lower your deductibles, copays, and coinsurance. To get these savings, you must choose a Silver plan. If you qualify, a Silver plan that normally covers 70% of costs could cover anywhere from 73% to 94%, depending on your income. The lower your income, the more generous the reduction. This is why financial advisors often recommend Silver plans for people with modest incomes, even if a Bronze plan has a cheaper sticker price.
Where to Buy ACA Coverage
The Marketplace is the central place to shop for ACA plans and apply for financial assistance. If your state runs its own exchange, you’ll use that state’s website. For 2026, 21 states plus Washington, D.C. operate their own exchanges. Everyone else uses HealthCare.gov, the federally run platform. Two additional states run their own exchanges but use the federal site’s technology for enrollment. Regardless of which platform you use, the plans must meet the same federal standards for coverage and consumer protections.
You can also buy ACA-compliant plans directly from insurance companies or through brokers outside the Marketplace, but there’s a critical difference: you can only receive premium tax credits and cost-sharing reductions if you enroll through the Marketplace.
Enrollment Dates and Deadlines
You can’t sign up for an ACA plan whenever you want. Open Enrollment runs from November 1 through January 15 each year. If you want coverage starting January 1, you need to enroll by December 15. Enrolling between December 16 and January 15 means your coverage starts February 1.
Outside of Open Enrollment, you can only sign up during a Special Enrollment Period, which is triggered by a qualifying life event. These include losing other health coverage, getting married, having a baby, or moving to a new area. A Special Enrollment Period typically gives you 60 days from the event to enroll or switch plans.
Who ACA Insurance Is Designed For
ACA Marketplace plans primarily serve people who don’t get affordable coverage through an employer or a government program like Medicare or Medicaid. That includes self-employed workers, freelancers, part-time employees, early retirees, and anyone between jobs. If your employer offers coverage that meets ACA affordability standards, you generally won’t qualify for Marketplace subsidies, though you can still buy a Marketplace plan at full price.
People with very low incomes (below 100% of the federal poverty level) may qualify for Medicaid instead, depending on their state. In states that expanded Medicaid under the ACA, adults earning up to 138% of the poverty level are typically eligible for Medicaid rather than Marketplace coverage.