ACA Essential Health Benefits and Metal Levels

Essential Health Benefits (EHB)

The Affordable Care Act (ACA) requires every non-grandfathered individual and small-group health plan to cover a defined set of Essential Health Benefits. The exam tests this as a closed list of ten categories. Any plan in those markets must include all ten, and it may not impose annual or lifetime dollar limits on EHB.

The ten categories are:

• Ambulatory (outpatient) patient services
• 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

A frequent trap: emergency services must be covered without prior authorization and without higher cost-sharing for out-of-network emergency care. Maternity coverage is mandatory even for plans purchased by a single male applicant, because EHB are benefit-category mandates, not need-based add-ons.

Preventive services at 100%

A distinct rule sits next to EHB: in-network preventive services on the recommended lists (USPSTF grade A/B, ACIP immunizations, HRSA women's and children's guidelines) must be covered with no cost-sharing — no copay, no coinsurance, no deductible. The exam likes the scenario where an insured gets a recommended screening colonoscopy in-network and is billed a copay; the correct answer is that the plan must pay 100%.

Note the in-network limit: if the member goes out of network, the no-cost-sharing rule does not apply. And once a screening turns into treatment (e.g., a polyp removed and biopsied), ordinary cost-sharing can attach to the treatment portion depending on plan terms.

Metal levels and actuarial value

Metal levels describe how costs are split between plan and member, not which services are covered. All four metal levels cover the same EHB; they differ in actuarial value (AV) — the percentage of total allowed costs the plan pays for a standard population. The member pays the rest through deductibles, copays, and coinsurance.

AV is calculated against a standard population, so an individual's actual spending will differ. A 70% Silver plan does not mean a given member pays exactly 30% of their own bills; it means that across a standard pool, the plan pays about 70% of total allowed charges. Tell clients: lower metal = lower premium but higher cost when care is used.

Worked numeric: estimating member exposure

Suppose a standard population is projected to incur $10,000 in total allowed costs. A Gold (80% AV) plan is expected to pay about $8,000, leaving roughly $2,000 to the standard population in deductibles and coinsurance. A Bronze (60% AV) plan pays about $6,000, leaving roughly $4,000. The premium difference between the two roughly mirrors that $2,000 swing in expected plan payments.

This is why the exam frames the trade-off as: a healthy buyer who rarely uses care may prefer Bronze (save on premium), while a buyer with chronic conditions usually nets out cheaper on Gold/Platinum despite the higher premium, because the deductible and coinsurance exposure is far lower.

Catastrophic plans

Catastrophic plans sit below Bronze. They carry very low premiums, very high deductibles, and cover EHB only after the deductible (plus the same three primary-care visits and preventive services). Eligibility is limited: enrollees must be under age 30, OR have a hardship or affordability exemption. Catastrophic plans are not eligible for premium tax credits.

Minimum Essential Coverage and out-of-pocket maximums

EHB plans qualify as Minimum Essential Coverage (MEC) — the level of coverage that satisfies the ACA coverage standard. MEC is the benchmark the Marketplace uses to decide whether a person already has qualifying coverage; losing MEC (for example, aging off a parent plan at 26 or a layoff ending an employer plan) is what triggers a Special Enrollment Period in the next section.

Every non-grandfathered EHB plan must also cap the member annual out-of-pocket maximum (OOPM). Once an in-network member reaches the OOPM through deductibles, copays, and coinsurance on EHB, the plan pays 100% of further covered EHB for the rest of the plan year. Premiums do not count toward the OOPM, and out-of-network charges generally do not count either. The exam scenario: a member who has already hit the in-network OOPM is billed coinsurance on a covered in-network hospital stay — the correct answer is that the plan owes 100% because the cap is satisfied.

Grandfathered plans and the EHB boundary

Not every health plan must follow these EHB and metal-level rules. Grandfathered plans — individual or group plans that existed on March 23, 2010 and have not made significant benefit cuts or cost-shifting changes — are exempt from several ACA requirements, including the full EHB package and metal-level classification. They must still honor certain core protections such as no lifetime limits on essential benefits and coverage of adult children to age 26.

The distinction matters for questions that contrast an old plan with a new ACA plan: a grandfathered plan may legally lack maternity coverage or charge a copay for a recommended preventive screening, whereas a non-grandfathered EHB plan may not. If a plan materially raises coinsurance, cuts benefits, or significantly increases the member share, it loses grandfathered status and must comply with the full EHB and cost-sharing rules going forward.