Everything Covered Under the Affordable Care Act's Essential Health Benefits

What Are Essential Health Benefits?

The Affordable Care Act (ACA) — also called the ACA or the federal health care law enacted in 2010 — requires most individual and small-group health insurance plans to cover a defined set of services known as Essential Health Benefits (EHBs). These ten benefit categories establish a coverage floor: insurers cannot sell a compliant plan that simply omits one of them.

Understanding EHBs matters because they tell you what your plan must cover before you look at any other policy detail. Think of them as the minimum contents of any ACA-compliant insurance package. For a plain-English primer on related terms like deductibles and copays, see Health Insurance Decoded.

This article is for general informational purposes only and does not constitute personalized insurance, legal, or medical advice. Coverage details, exclusions, and cost-sharing vary by plan and state. Always review your actual policy documents and consult a licensed insurance professional for guidance specific to your situation.

The Ten Required Benefit Categories

Federal rules organize EHBs into ten distinct categories. Here is what each one covers in practice:

1. Ambulatory patient services — outpatient care, including doctor office visits and same-day procedures, without a hospital admission.
2. Emergency services — care in a hospital emergency department; plans cannot require prior authorization or charge higher cost-sharing for out-of-network emergency visits.
3. Hospitalization — inpatient stays, surgeries, and overnight care in a hospital or facility.
4. Maternity and newborn care — prenatal visits, labor and delivery, and post-delivery care for mother and baby.
5. Mental health and substance use disorder services — behavioral health treatment, counseling, and substance use disorder programs, including inpatient and outpatient care.
6. Prescription drugs — at least one drug in every category and class listed in a plan's formulary (the covered drug list); specifics vary by plan.
7. Rehabilitative and habilitative services and devices — therapy that helps patients recover lost function (rehabilitative) or develop skills never acquired (habilitative), plus related devices like wheelchairs.
8. Laboratory services — diagnostic tests, blood work, imaging, and other lab procedures ordered by a provider.
9. Preventive and wellness services and chronic disease management — includes screenings, immunizations, and annual checkups recommended by federal guidelines, typically at no cost-sharing when using in-network providers.
10. Pediatric services — care for children, including dental and vision coverage that adults are not guaranteed under EHBs.

The specific scope within each category — which drugs, which devices, which therapies — can differ between plans and states. Reviewing your plan's Summary of Benefits and Coverage document is the clearest way to confirm exact coverage.

What EHBs Do and Don't Apply To

EHB requirements apply to non-grandfathered individual and small-group plans sold on or off the ACA marketplace, as well as Medicaid expansion coverage. They do not automatically apply to large employer self-insured plans, short-term health plans, or grandfathered plans that existed before the ACA and have not changed significantly.

This is important: if you have coverage through a large employer, your plan may cover all ten categories as a practical matter — many large employers choose to — but is not legally required to do so under the EHB rules. Understanding which plan structure you have affects how you interpret your coverage. See HMO, PPO, EPO, and HDHP plan types for context on how plan architecture interacts with coverage requirements.

States also have latitude to designate a benchmark plan — a reference plan that defines how broadly or narrowly each EHB category is interpreted within that state. As a result, the precise services included in, say, rehabilitative care or mental health coverage can vary by where you live. To understand how these coverage rules connect to what you ultimately pay, learn how premiums, subsidies, and cost-sharing interact.