15.1 ACA Essential Health Benefits and Metal Levels

Essential Health Benefits (EHBs)

The Affordable Care Act requires every non-grandfathered individual and small-group plan to cover ten categories of essential health benefits (EHBs). Plans may design networks and formularies, but they cannot exclude an entire EHB category, and they cannot place annual or lifetime dollar limits on EHBs.

The ten EHB categories are:

• Ambulatory (outpatient) services
• Emergency services
• Hospitalization
• Maternity and newborn care
• Mental health and substance use disorder services, including behavioral health
• 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 common exam trap: emergency services must be covered without prior authorization and at the in-network cost-sharing level even if the hospital is out-of-network. Another trap: dollar limits are banned on EHBs, but plans may still apply visit limits (for example, a cap on physical-therapy visits) so long as the limit is not a disguised dollar cap.

Preventive services and no cost-sharing

ACA plans must cover a defined list of preventive services at 100% with no cost-sharing when delivered in-network. That means no copay, no coinsurance, and no application of the deductible. The list includes United States Preventive Services Task Force (USPSTF) A and B recommendations, routine immunizations, and certain women's and children's preventive screenings.

If a member goes out-of-network for preventive care, the plan may impose normal cost-sharing. Also, if a screening turns into a diagnostic or treatment service (for example, a screening colonoscopy that becomes therapeutic), the plan may apply cost-sharing to the diagnostic portion depending on coding rules. Producers should set expectations: "free" preventive care applies to the recommended preventive list received in-network, not to all care.

Metal levels and actuarial value

ACA plans are grouped into metal levels based on actuarial value (AV) — the percentage of total covered medical costs the plan is expected to pay across a standard population, not the percentage any single person pays.

A de minimis variation of roughly ±2% is permitted, so a "Silver" plan may have an AV between about 68% and 72%. Because AV is a population average, two Silver plans can differ sharply in design: one may pair a high deductible with a low coinsurance, another a low deductible with copays. The metal tier does not tell a buyer what their deductible or out-of-pocket maximum is — it tells them the average split of covered costs.

Worked example: A Gold plan has an 80% AV. That does not mean each claim is paid 80/20. It means that, modeled across a standard population's expected claims, the plan pays about 80% of total covered costs after deductibles, copays, coinsurance, and the out-of-pocket maximum all interact. An individual with very low claims might effectively pay 100% (everything under the deductible); an individual with catastrophic claims might effectively pay far less than 20% once the out-of-pocket maximum caps their spending.

Catastrophic plans and out-of-pocket maximums

Catastrophic plans are a separate category with very low premiums, high deductibles, and EHB coverage that kicks in mostly after the deductible (other than the required free preventive visits and a few primary-care visits). Eligibility is limited: an enrollee must be under age 30, or qualify for a hardship or affordability exemption. Catastrophic plans do not qualify for premium tax credits.

All non-grandfathered plans must cap in-network out-of-pocket spending on EHBs at the annual out-of-pocket maximum (OOPM). Once a member hits the OOPM, the plan pays 100% of in-network EHB costs for the rest of the plan year. Premiums never count toward the OOPM, and out-of-network or non-EHB charges generally do not count either. The OOPM is a key consumer-protection feature: it converts an unlimited-risk health exposure into a known maximum loss for the year.

The Ten Essential Health Benefits and Metal-Level Actuarial Values

The ACA requires non-grandfathered individual and small-group plans to cover ten categories of essential health benefits, and the exam may list them: ambulatory (outpatient) services, emergency services, hospitalization, maternity and newborn care, mental health and substance-use disorder services, prescription drugs, rehabilitative and habilitative services, laboratory services, preventive and wellness services with chronic-disease management, and pediatric services including dental and vision.

Preventive services from a recommended list must be covered at no cost-sharing, meaning no copay or deductible, which is a frequently tested point because it is one of the few first-dollar features in a deductible-based plan.

Metal levels describe actuarial value, the share of total covered costs the plan pays on average for a standard population, not the share for any one person. Bronze pays about 60%, Silver about 70%, Gold about 80%, and Platinum about 90%, with the member's premium and cost-sharing moving inversely: Bronze has the lowest premium but the highest deductible and out-of-pocket exposure, while Platinum reverses that. A catastrophic plan with very high deductibles is available mainly to those under 30 or with a hardship exemption.

Work a trade-off: a healthy young enrollee expecting few claims may rationally choose Bronze to minimize premium, accepting a high deductible, while someone with chronic conditions and frequent care is usually better served by Gold or Platinum despite the higher premium, because the lower deductible and richer cost-sharing reduce total annual spending. The crucial subsidy interaction, that cost-sharing reductions attach only to Silver plans, makes Silver the right pick for many lower-income enrollees even when Bronze looks cheaper, a point developed in the subsidy section.