What the ACA Marketplace Covers — and What It Doesn't

The Ten Essential Health Benefits: What Every Plan Must Include

The ACA established ten categories of Essential Health Benefits (EHBs) that every Marketplace plan sold in the United States must cover. These aren't optional — they're a federal floor. Here's what's required:

• Ambulatory patient services — outpatient care like doctor visits and same-day procedures
• Emergency services — ER visits, including out-of-network emergencies
• Hospitalization — inpatient surgery, overnight stays, and related care
• Maternity and newborn care — prenatal visits, labor, delivery, and postnatal support
• Mental health and substance use disorder services — therapy, counseling, and addiction treatment
• Prescription drugs — based on each plan's formulary
• Rehabilitative and habilitative services — physical therapy, occupational therapy, speech therapy
• Laboratory services — diagnostic tests and bloodwork
• Preventive and wellness services — screenings, vaccines, and annual checkups
• Pediatric services — including dental and vision for children

Having a service listed under an EHB category doesn't mean it's free. You'll typically still owe deductibles, copays, and coinsurance based on your plan's structure. For a closer look at how those cost mechanics work, see our overview of insurance coverage and costs.

What ACA Marketplace Plans Commonly Don't Cover

Knowing the gaps is just as important as knowing the inclusions. Several categories are routinely excluded from standard Marketplace plans:

Adult Dental and Vision

Pediatric dental and vision care are required for children, but adults are on their own. Routine dental cleanings, fillings, and eye exams typically require separate standalone plans or optional riders. Some insurers offer bundled add-ons, but these aren't guaranteed on every plan.

Long-Term Care

Custodial care — help with daily activities like bathing or dressing, whether at home or in a facility — is not covered. This type of care requires a dedicated long-term care policy or Medicaid eligibility in most cases.

Cosmetic and Elective Procedures

Services deemed not medically necessary — cosmetic surgery, most weight-loss surgery, fertility treatments in many states — are generally excluded. Medical necessity is defined by your insurer, and decisions can be contested through a formal appeals process.

Experimental Treatments

Treatments not yet approved by the FDA or considered investigational are usually excluded. Clinical trial participation may offer access to emerging therapies, but standard Marketplace plans don't typically cover experimental protocols.

This pattern of inclusion and exclusion mirrors broader insurance coverage principles. For a cross-category perspective, see what insurance actually covers and what it doesn't.

The Preventive Care Exception — and Why It Matters

One of the more consumer-friendly rules in the ACA is that many preventive services must be covered at no cost-sharing when delivered by an in-network provider. This means no copay, no deductible applied — the insurer absorbs the full cost. Qualifying services include annual wellness visits, cholesterol screenings, blood pressure checks, certain cancer screenings, and a range of recommended vaccines.

The catch: the zero-cost rule applies only when the visit is coded as preventive. If a doctor addresses a new problem or orders additional tests during what started as a preventive visit, those services may be billed separately and subject to normal cost-sharing. The specifics are worth understanding before your next checkup. Our article on why preventive care is covered differently walks through those distinctions in detail.

How Plan Type Affects What You Can Access

Even within ACA-compliant plans, your access to covered services depends heavily on the plan's network structure:

• HMO (Health Maintenance Organization): Requires a primary care physician referral to see specialists. Out-of-network care is generally not covered except in true emergencies.
• PPO (Preferred Provider Organization): More flexibility to see specialists without referrals. Out-of-network care is partially covered, usually at a higher cost.
• EPO (Exclusive Provider Organization): Like an HMO for network restrictions, but typically without the referral requirement. No out-of-network coverage.
• HDHP (High Deductible Health Plan): Lower premiums, higher deductibles — often paired with a Health Savings Account (HSA). Frequently available across all network types.

Plan type doesn't change the list of required benefits, but it significantly affects whether you can afford to use them and which providers you can see. If you're weighing a Marketplace plan against coverage through an employer, comparing the two types is a useful starting point.

For those considering a short-term plan as an alternative, keep in mind those plans are not ACA-compliant and can exclude EHBs entirely. Short-term health insurance carries significant limitations that standard Marketplace plans avoid.