Essential Health Benefits Under Federal Law
Federal law requires that health insurance plans sold in the individual and small-group markets cover a defined set of services known as Essential Health Benefits (EHBs). This page explains what those benefits are, how the coverage mandate operates, which plan types are subject to it, and how the boundaries of required coverage are drawn. Understanding EHBs is foundational to evaluating any health plan, because the presence or absence of these protections directly determines whether a plan provides comprehensive coverage or exposes enrollees to gaps.
Definition and Scope
The Affordable Care Act (ACA), codified at 42 U.S.C. § 18022, established 10 categories of Essential Health Benefits that qualifying health plans must cover without annual or lifetime dollar limits. The Department of Health and Human Services (HHS) enforces this requirement through regulations published at 45 C.F.R. Part 156.
The 10 statutory EHB categories are:
- Ambulatory patient services (outpatient care)
- Emergency services
- Hospitalization
- Maternity and newborn care
- Mental health and substance use disorder services, including behavioral health treatment
- Prescription drugs
- Rehabilitative and habilitative services and devices
- Laboratory services
- Preventive and wellness services and chronic disease management
- Pediatric services, including oral and vision care
Each state selects a benchmark plan that defines the specific scope of services within these 10 categories. As of the 2017 plan year, states could choose their own benchmark rather than defaulting to the largest small-group plan in the state, per CMS guidance on EHB benchmark plans. This means coverage details — such as which prescription drugs are included or the exact limits on physical therapy visits — vary by state, even though the category structure is federal.
How It Works
Plans subject to the EHB mandate must cover all 10 categories without imposing a dollar cap on any single category over a plan year or a lifetime. The prohibition on annual and lifetime limits applies specifically to EHB-covered services; plans may still apply cost-sharing such as deductibles, copayments, and coinsurance.
The mandate applies to:
- Non-grandfathered individual market plans
- Non-grandfathered small-group market plans (employers with up to 50 employees in most states, up to 100 in some)
- Marketplace plans under how the Health Insurance Marketplace works
Large-group plans and self-insured employer plans are not required to cover EHBs, though they are subject to the prohibition on annual and lifetime dollar limits if they choose to cover a given category. For a detailed treatment of how employer-sponsored plan rules interact with EHB requirements, the page on self-funded vs. fully insured employer plans provides structural context.
Habilitative services — those that help a person acquire or maintain a skill rather than restore a lost one — were explicitly named in the ACA because they had historically been excluded from coverage. HHS has required plans to cover habilitative services at parity with rehabilitative services since 2014 (45 C.F.R. § 156.115(a)(5)).
Preventive care within the EHB framework connects directly to a separate mandate requiring first-dollar coverage of USPSTF-rated services. The page on preventive care coverage requirements covers that mechanism in detail.
Common Scenarios
Maternity coverage dispute: Before the ACA, individual market plans routinely excluded maternity coverage or sold it as a separate rider. Under EHB rules, maternity and newborn care is a required category. A plan that structures cost-sharing for maternity services in a way that effectively makes them inaccessible may be found to violate the no-limitation rule, a determination that falls to the state insurance commissioner or HHS.
Mental health parity interaction: EHBs require coverage of mental health and substance use disorder services, and a separate federal law — the Mental Health Parity and Addiction Equity Act — requires that the financial requirements and treatment limits for those services be no more restrictive than for medical and surgical benefits. The page on mental health parity requirements explains where these two mandates intersect.
HMO plan enrollment: Health Maintenance Organization plans sold in the individual or small-group market must cover all 10 EHB categories. HMO Authority provides a detailed reference on how HMO plan structures — including gatekeeper requirements and network limitations — operate within the EHB framework, which matters when evaluating whether a specific service referral falls inside covered benefits.
EPO plan enrollment: Exclusive Provider Organization plans, which restrict coverage to in-network providers without referral requirements, are also fully subject to EHB rules. EPO Authority examines how EPO network restrictions interact with access to all mandated EHB categories, including emergency services, which must be covered at in-network cost-sharing levels even when received out of network under ACA rules.
HDHP and HSA pairing: High-Deductible Health Plans sold in the individual or small-group market must cover all 10 EHB categories, but cost-sharing structures are constrained by IRS rules on HSA eligibility. HDHP Authority addresses how the deductible floors set by the IRS — $1,600 for self-only coverage and $3,200 for family coverage in 2024, per IRS Rev. Proc. 2023-23 — apply to EHB-covered services and the specific preventive care exception.
Decision Boundaries
EHB requirements do not apply uniformly across all plan types, and understanding those boundaries is critical when comparing options.
| Plan or Market | EHB Mandate Applies? | No Annual/Lifetime Limits? |
|---|---|---|
| Individual market (non-grandfathered) | Yes | Yes, for EHBs |
| Small-group market (non-grandfathered) | Yes | Yes, for EHBs |
| Large-group fully insured | No | Yes, for any covered benefit |
| Self-insured employer plan | No | Yes, for any covered benefit |
| Grandfathered plan | No | No |
| Short-term limited-duration plan | No | No |
| Catastrophic plan | Partial (3 EHBs required) | Yes, for covered EHBs |
Short-term health insurance plans are explicitly exempt from EHB requirements under federal rules, which is a primary reason they can exclude maternity care, mental health services, or prescription drugs. Grandfathered plans — those that existed on March 23, 2010, and have not made substantial changes — are also exempt.
Catastrophic plans, available only to adults under age 30 or those with a hardship exemption, must cover 3 primary care visits per year before the deductible and all 10 EHB categories after the deductible is met, per 45 C.F.R. § 156.155.
When comparing plan structures side by side, the overview available at the National Health Insurance Authority home provides a framework for understanding how plan type classification determines which federal benefit mandates apply. For enrollees evaluating coverage with a specific chronic or ongoing condition, the page on choosing a plan with a chronic condition applies EHB category analysis to real-world coverage decisions.
State-mandated benefits, which can require coverage beyond the 10 federal EHB categories in fully insured plans, are a separate layer of regulation addressed at state mandated benefits explained.
References
- 42 U.S.C. § 18022 — Essential Health Benefits (House Office of the Law Revision Counsel)
- 45 C.F.R. Part 156 — Health Insurance Issuer Standards Under the Affordable Care Act (eCFR)
- CMS — Essential Health Benefits: Benchmark Plan Information
- IRS Revenue Procedure 2023-23 — HSA Inflation Adjustments for 2024
- HHS Office of the Assistant Secretary for Planning and Evaluation — ACA Essential Health Benefits Overview
- 45 C.F.R. § 156.155 — Catastrophic Plans (eCFR)
The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)