Understanding Health Insurance: Premiums, Deductibles, Copays

Health insurance is a contract: you pay a monthly amount, and the insurer agrees to share the cost of your medical care according to a long list of rules. The rules are written in plain language by federal law, but the words are not always plain. This is a vendor-neutral guide to the basic terms — premiums, deductibles, copays, and the rest — so you can read any health plan document with more confidence.

This article does not recommend a specific carrier or a specific kind of plan. For a feel for how a monthly premium fits into a budget, our budget calculator can help. For more vocabulary, see APR and interest rate, and the Learn hub for related topics.

The four words that matter most

Every health plan describes itself with four numbers. The official federal glossary at healthcare.gov, maintained by the Centers for Medicare & Medicaid Services (CMS), defines them:

• Premium — the amount you pay every month, whether you use any care or not.
• Deductible — the amount you have to pay yourself before the insurance starts sharing the bill.
• Copay — a fixed dollar amount you pay for a specific service (for example, $30 for a doctor visit).
• Coinsurance — a percentage of the bill you pay after the deductible is met (for example, 20% of an MRI cost).

Together these four pieces decide what any visit really costs.

How a typical year actually plays out

Imagine a plan with a $500 monthly premium, a $2,000 deductible, $30 office copays, and 20% coinsurance after the deductible. A simplified year:

• Every month, you pay $500 in premium — $6,000 across the year.
• The first $2,000 of medical bills (other than what copays and preventive care cover) come out of your pocket.
• After you have hit the deductible, you pay 20% of further bills and the insurer pays 80%, until you hit the out-of-pocket maximum.
• Once you hit the out-of-pocket maximum, the insurer pays 100% of covered care for the rest of the year.

Almost every health plan in the United States works on this basic shape. The CMS healthcare.gov glossary has worked examples for each piece.

Out-of-pocket maximum (OOP max)

The out-of-pocket maximum (OOP max) is the most you can be required to pay in a year for covered, in-network care — combining your deductible, copays, and coinsurance. Premium does not count toward the OOP max.

The Affordable Care Act sets a federal limit on OOP maxes for most plans, updated each year by CMS. The 2024 limit was $9,450 for one person and $18,900 for a family — for example only; the number changes annually and is published at healthcare.gov.

The OOP max is one of the most important numbers on a plan. It is the worst-case yearly cost for in-network care.

In-network vs out-of-network

Insurers contract with specific doctors, hospitals, and labs to be in-network. In-network providers agree to negotiated prices and accept the plan's rules.

• In-network — covered at the plan's stated rates. Counts toward the deductible and OOP max.
• Out-of-network — usually costs much more, sometimes is not covered at all, and may not count toward the OOP max in the same way.

Always check whether a doctor or hospital is in-network before scheduling non-emergency care. The federal No Surprises Act (enforced by CMS) protects you from many out-of-network surprise bills in emergencies and at in-network facilities.

Common plan types (vendor-neutral)

The federal glossary at healthcare.gov lists the standard types. None is "better" — they trade off in different ways:

• HMO (Health Maintenance Organization) — usually has a smaller network, requires choosing a primary care doctor, and often requires referrals to see specialists.
• PPO (Preferred Provider Organization) — larger network, no referrals required, more flexibility but often higher monthly premiums.
• EPO (Exclusive Provider Organization) — like an HMO without the referral requirement, but no out-of-network coverage outside emergencies.
• POS (Point of Service) — a hybrid that often requires a primary care doctor but allows out-of-network coverage at a higher cost.
• HDHP (High-Deductible Health Plan) — a plan with a higher deductible and lower premium that pairs with an HSA (Health Savings Account). The IRS sets the deductible and OOP max minimums each year.

Which one fits depends on your doctors, your typical care use, and your budget — not on which type sounds better.

What is always covered (the "essential health benefits")

The Affordable Care Act requires most plans to cover ten essential health benefit categories:

1. Outpatient services.
2. Emergency services.
3. Hospitalization.
4. Pregnancy, maternity, and newborn care.
5. Mental health and substance use treatment.
6. Prescription drugs.
7. Rehabilitative and habilitative services.
8. Lab tests.
9. Preventive and wellness services.
10. Pediatric services.

The full list and details are at healthcare.gov.

Free preventive care

By federal law, most plans must cover a list of preventive services at no cost to you — no copay, no coinsurance, no deductible — when received from an in-network provider. The CMS list at healthcare.gov includes things like:

• Yearly check-ups.
• Many vaccines.
• Routine screenings (blood pressure, cholesterol, diabetes, certain cancers).
• Counseling for tobacco, alcohol, and obesity.

This is one of the strongest features of modern coverage. Use it.

Where most people get coverage

A few common paths the U.S. Department of Health and Human Services lists:

• Through an employer. The most common path. Your employer usually pays a share of the premium.
• Through the federal or state Marketplace at healthcare.gov. Many people qualify for income-based subsidies that lower the premium.
• Through Medicaid or the Children's Health Insurance Program (CHIP), for those who qualify based on income and household size.
• Through Medicare, for people 65+ and certain people with disabilities.
• Through a parent's plan, up to age 26 under federal law.
• A short-term plan as a gap option — but these have limited coverage and are not always required to cover essential health benefits.

Reading a Summary of Benefits and Coverage (SBC)

Federal law requires every plan to publish a Summary of Benefits and Coverage (SBC) in a standardized format. It is the same shape across every insurer so you can compare apples to apples. CMS hosts samples at healthcare.gov.

A few high-value lines to compare:

• Monthly premium.
• Deductible (individual and family).
• OOP maximum (individual and family).
• Primary care visit copay.
• Specialist visit copay.
• Generic and brand prescription costs.
• Emergency room copay.

If two plans look similar on premium, the SBC is where the real differences show up.

Tax notes

A few quick tax connections (general info, not tax advice):

• Premiums you pay through a workplace plan are usually pre-tax.
• HSAs (paired with HDHPs) are triple tax-advantaged — see our tax-advantaged accounts overview.
• The IRS at irs.gov has the rules and limits, which change every year.

Talk to a CPA for your specific situation.

Common traps

A few things the CMS, FTC, and CFPB consumer alerts repeat:

• Picking a plan only on premium and ignoring the deductible.
• Forgetting to verify that a doctor is in-network.
• Misreading "out-of-pocket maximum" as including the premium (it does not).
• Buying a non-Marketplace short-term plan thinking it covers everything (it usually does not).
• Falling for "discount card" scams marketed as health insurance.

If something is being sold as health insurance and it does not appear at healthcare.gov or your state Marketplace, check carefully.

Free help

• The federal Marketplace at healthcare.gov and your state's Marketplace if it has one.
• Free Marketplace navigators and certified application counselors — listed on healthcare.gov.
• USA.gov at usa.gov/health-insurance.
• The Centers for Medicare & Medicaid Services (CMS) at cms.gov.
• The Federal Trade Commission at ftc.gov for warnings about insurance scams.

A note on advice

This is general information, not insurance advice. The right plan depends on your doctors, your prescriptions, your typical care use, and your budget. A free Marketplace navigator can walk through your real numbers without trying to sell you anything.

Numbers and rules in this article change every year — always check the latest from the IRS, CFPB, and your state's consumer protection department.