The Ten Categories the ACA Requires
When Congress passed the Affordable Care Act, one of its central goals was to end the era of coverage so narrow it left policyholders exposed to catastrophic gaps. The solution: a federally defined floor of coverage that qualifying plans must meet. That floor is the ten Essential Health Benefit categories.
Here's what those ten categories are:
- Ambulatory patient services — outpatient care, such as office visits and same-day procedures
- Emergency services — ER visits, including stabilization care
- Hospitalization — inpatient stays, surgeries, and overnight care
- Maternity and newborn care — prenatal visits, labor and delivery, and postnatal care
- Mental health and substance use disorder services — behavioral health treatment and counseling
- Prescription drugs — medications on the plan's formulary
- Rehabilitative and habilitative services and devices — physical therapy, occupational therapy, and assistive devices
- Laboratory services — diagnostic tests and screenings
- Preventive and wellness services, and chronic disease management — recommended screenings, vaccines, and counseling
- Pediatric services, including oral and vision care — dental and vision care for children
For a broader understanding of how these requirements fit into the US coverage landscape, see our plain-language overview of health insurance.
10
Federally required EHB coverage categories
Established by the Affordable Care Act and applicable to qualifying individual and small-group plans.
50+
State benchmark plans shaping EHB specifics
Each US state and territory selects its own benchmark plan, creating variation in covered services within the ten categories.
158M+
Americans with employer-sponsored coverage
According to KFF estimates, most employer-sponsored coverage comes from large self-funded plans not subject to all EHB mandates.
What Coverage Actually Means — and What It Doesn't
Requiring coverage is not the same as requiring that coverage be free or unlimited. Plans that include EHBs can still apply deductibles, copays, and coinsurance to most services within those categories. The notable exception: federally recommended preventive services (such as certain cancer screenings and recommended vaccines) must be provided at no cost when you use an in-network provider.
Beyond cost-sharing, coverage within a category can also be shaped by prior authorization requirements, network restrictions, and formulary design. For example, a plan may cover prescription drugs as a category but exclude a specific brand-name medication from its formulary entirely. Understanding terms like formulary, prior authorization, and in-network is essential — the Health Insurance Glossary Every Policyholder Should Know defines these and dozens of other terms clearly.
Check Your Summary of Benefits First
Before enrolling in any plan, request and read the Summary of Benefits and Coverage (SBC). This standardized two-page document is required for all qualifying plans and outlines covered benefits, cost-sharing amounts, and coverage limits in plain language. It's the fastest way to compare what two plans actually cover beyond the category names.
Always review your plan's Summary of Benefits and Coverage (SBC) — a standardized document every plan must provide — to understand exactly which services are covered, at what cost, and under what conditions.
Which Plans Are Actually Bound by These Rules
Not every health plan in the US is required to comply with EHB mandates. The rules apply to:
- Non-grandfathered individual and family plans sold on or off the ACA Marketplace
- Small-group plans (generally covering employers with fewer than 50 employees)
- Medicaid benchmark and benchmark-equivalent plans
Plans that are not required to cover all EHBs include:
- Large employer self-funded plans (which cover most workers at major companies)
- Grandfathered plans (those in existence before the ACA passed that haven't made significant changes)
- Short-term limited-duration health plans
- Association health plans in some cases
This distinction matters enormously when you're choosing between a Marketplace plan and employer-sponsored coverage. The Employer-Sponsored vs. Marketplace Health Insurance guide walks through how these pathways differ in practice. Plan type also intersects with EHBs — see HMO, PPO, EPO, and HDHP explained to understand how plan structures interact with coverage rules.
Short-Term Plans Are a Different Category
Short-term limited-duration health plans are not required to cover EHBs and often exclude maternity care, mental health services, and prescription drugs. They may be less expensive, but they carry significant coverage gaps. If you're considering a short-term plan, read the policy exclusions carefully before enrolling.
The Role of State Benchmark Plans
The ACA sets the ten EHB categories, but it delegates a critical detail to the states: defining precisely which services within each category must be covered. States do this by selecting a benchmark plan — typically a popular small-group plan from the state's existing market — whose benefit design sets the local standard.
What this means in practice: two people enrolled in ACA-compliant plans in different states may find that coverage for a specific therapy or drug differs, even though both plans satisfy EHB requirements. The ten categories are uniform nationwide; the content within them is not.
“The essential health benefits standard was designed to ensure that insurance actually insures — that a plan sold to the public covers the range of services people genuinely need, not just the ones that are cheapest to provide.”
— Health Policy Analyst, Health policy researcher specializing in ACA implementation
When reviewing any plan, look beyond the category names on a benefits summary. The Summary of Benefits and Coverage and the plan's full Evidence of Coverage document will show which specific services are included, excluded, or subject to limits. If you receive an explanation of benefits after a claim and want to verify charges, understanding your EOB statement can help you read it accurately.
This article provides general educational information about health insurance and is not legal, financial, or medical advice. Coverage rules, plan details, and regulations vary by state and provider. Consult a licensed insurance professional or broker for guidance specific to your situation.
Frequently Asked Questions
No. EHBs apply to non-grandfathered individual and small-group plans, including those sold on the ACA Marketplace. Large employer self-funded plans and grandfathered plans are exempt. If you're unsure about your plan's status, check your Summary of Benefits and Coverage document.
No. Plans must cover the ten categories, but cost-sharing — including deductibles, copays, and coinsurance — still applies. Preventive services specifically recommended under federal guidelines are generally covered at no cost in-network, but most other services within EHB categories involve some out-of-pocket expense.
Yes. Mental health and substance use disorder services are one of the ten EHB categories. Plans must also comply with federal mental health parity rules, meaning coverage limits for mental health care cannot be more restrictive than those for comparable medical or surgical benefits.
Each state selects a benchmark plan — typically a popular small-group plan — that defines how EHBs are implemented in that state. This means the specific services covered within each category can vary from state to state, even though the ten categories themselves are federally required.
Prescription drug coverage is one of the ten EHB categories, so plans must offer it. However, each plan maintains its own formulary — a list of covered drugs — and a specific medication may not appear on it. You may need prior authorization or face step-therapy requirements before certain drugs are covered.
Adult dental and vision care are not included in the ten EHB categories and are generally not required by the ACA. However, pediatric dental and vision care are required as a separate EHB category for children. Adult dental and vision coverage typically requires purchasing a separate supplemental plan.
The content on this site is for informational purposes only and is not a substitute for professional advice. Always consult a qualified professional for guidance specific to your situation.