The Foundation: Essential Health Benefits
Under the Affordable Care Act (ACA), most health insurance plans sold in the individual and small-group markets are required to cover a set of Essential Health Benefits (EHBs). These are baseline protections that apply regardless of which plan you choose — though the specific details, like which drugs are covered or which providers are in-network, vary by plan.
The 10 Essential Health Benefit Categories
- Ambulatory patient services — Outpatient care you receive without being admitted to a hospital (doctor visits, urgent care)
- Emergency services — ER visits and stabilization care, even out-of-network
- Hospitalization — Inpatient care, surgery, and overnight stays
- Maternity and newborn care — Prenatal visits, labor, delivery, and postnatal care
- Mental health and substance use disorder services — Therapy, counseling, and addiction treatment
- Prescription drugs — At least one drug in every category of medication must be covered
- Rehabilitative and habilitative services — Physical therapy, occupational therapy, and devices
- Laboratory services — Blood tests, diagnostic imaging, and pathology
- Preventive and wellness services — Screenings, vaccines, and annual checkups (often at no cost)
- Pediatric services — Children's dental and vision care
Preventive Care: Often Free with Insurance
One of the most valuable and underused benefits is preventive care at no cost-sharing. When you receive in-network preventive services — like an annual wellness exam, blood pressure screening, colonoscopy, or flu shot — your plan generally cannot charge you a copay or apply your deductible.
This applies as long as the visit is purely preventive. If a concern is identified during the visit and treated, cost-sharing rules may apply.
Mental Health Coverage
The Mental Health Parity and Addiction Equity Act requires that mental health and substance use disorder benefits be comparable to medical and surgical benefits. This means plans cannot impose stricter limits on mental health visits than they do on, say, specialist visits.
- Therapy and counseling sessions
- Psychiatric care and inpatient mental health treatment
- Substance use disorder (SUD) treatment programs
Prescription Drug Coverage
Plans use a formulary — a tiered list of covered drugs. Lower tiers (generic drugs) typically have the lowest copays, while higher tiers (brand-name or specialty drugs) cost more. Always check whether your current medications are on a plan's formulary before enrolling.
What Health Insurance Typically Does NOT Cover
- Cosmetic procedures (unless medically necessary)
- Adult dental care (unless you purchase a separate dental plan)
- Adult vision exams and glasses (often excluded from medical plans)
- Long-term care
- Experimental or investigational treatments
- Acupuncture and some alternative therapies (varies by plan)
How to Read Your Plan's Summary of Benefits
Every health plan is required to provide a Summary of Benefits and Coverage (SBC) — a standardized document that explains what the plan covers and what you'll pay. Before enrolling, review the SBC to:
- Confirm your specific medications are covered
- Understand cost-sharing for specialist visits and hospital stays
- Identify any services that require prior authorization
Understanding coverage before you need it is the best way to avoid surprise medical bills.