Health insurance costs work through a cost-sharing structure between you and your plan. Marketplace plans require you to pay a monthly premium for coverage, meet a deductible before your plan starts paying, then share costs through copayments or coinsurance until you reach your out-of-pocket maximum. For 2026, the maximum out-of-pocket limit is $10,600 for individuals and $21,200 for families.
How Does Health Insurance Work?
Updated: August 21, 2026
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Key Takeaways
Health insurance works by splitting costs: you pay monthly premiums, meet your deductible, then pay copays or co-insurance.
Marketplace plans cover 10 essential health benefits, including doctor visits, hospital stays, prescription drugs, mental health services and preventive care.
Get enough coverage to limit your financial risk. Match your plan to how much care you expect to use.
How Do Health Insurance Costs Work?
Pay your premiumYour monthly payment to keep coverage active, paid whether you use health care services or not. Insurers set premiums based on five factors: age (up to three times higher for older adults), location, tobacco use (up to 50% more), individual versus family enrollment and plan category. Bronze plans have the lowest monthly premiums but highest out-of-pocket costs, while Platinum plans have the highest premiums and lowest out-of-pocket costs.
Meet your deductibleThe amount you pay for covered services before your plan starts sharing costs. Preventive care such as annual checkups, flu shots, vaccinations and wellness screenings is covered at 100% by all Marketplace plans even before you meet your deductible when you use in-network providers.
Share costs through copayments and coinsurance:After meeting your deductible, you share costs with your health plan. Copayments are fixed amounts (like $20 for a doctor visit), while coinsurance is a percentage you pay (usually 20%) and your plan pays the rest (80%). PPO plans allow out-of-network care but charge higher coinsurance, often 40%.
Reach your out-of-pocket maximumAfter you pay $10,600 for individuals or $21,200 for families in covered expenses during 2026, Marketplace plans pay 100% of covered in-network services through the end of the year. Your premium continues each month, but you pay nothing for covered medical care after reaching this limit.
Access no-cost preventive carePreventive services including annual checkups, immunizations, screening tests and wellness visits are covered at 100% when you use in-network providers, even before meeting your deductible. Catastrophic plans cover at least three primary care visits per year at no cost before you meet your deductible.
How Does a Health Insurance Claim Work?
A health insurance claim is a request for your insurer to pay its share of a covered medical service. When you visit a doctor, hospital or other provider, the provider submits the claim for you. Your insurer reviews the service, applies your plan's negotiated rate and determines what the plan pays and what you owe.
- 1You receive medical care
Your provider records the services you received and assigns billing codes for each service.
- 2The provider submits the claim
The provider sends the claim to your insurer with information about your visit, treatment and charges. If you pay for care yourself, you may need to submit the claim.
- 3Your insurer processes the claim
Your insurer checks whether the service is covered, whether the provider is in-network and how your deductible, copay or coinsurance applies.
- 4The insurer pays its share
Your health plan pays the provider based on your policy's benefits and negotiated rates.
- 5You receive an Explanation of Benefits
Your Explanation of Benefits (EOB) shows what the provider charged, what your insurer allowed and paid and what you may owe. An EOB isn't a bill. Your provider sends a separate bill for your share.
HOW PROVIDER NETWORKS AND HEALTH SAVINGS ACCOUNT IMPACT YOUR COSTS
Provider networks and Health Savings Accounts (HSAs) are two mechanisms that reduce your out-of-pocket costs within the health insurance system.
- Use in-network providers: In-network providers contract with health plans to offer discounted rates. People without insurance pay about twice as much for the same care. You'll pay less for an office visit in-network ($85) compared to someone without coverage ($150), even before meeting your deductible. HMO and EPO plans limit coverage to in-network care except in emergencies.
- Consider a Health Savings Account: All 2026 Bronze and Catastrophic plans are eligible for Health Savings Accounts, which let you set aside pre-tax money for medical expenses like deductibles, copayments and coinsurance. Money you don't spend rolls over year to year.
What Does Health Insurance Cover?
Health insurance covers many medical services, but whether a specific treatment is covered depends on your plan, why you need the service and whether you meet requirements such as using an in-network provider or getting prior authorization.
Fertility testing | Sometimes | Diagnostic testing may be covered, but fertility benefits vary by plan and state. IVF and other fertility treatments may have separate coverage rules or exclusions. |
Prescription drugs | Usually | Most health plans cover prescription medications through a formulary. Your cost depends on the drug's tier and your plan's copay or coinsurance. |
Ambulance services | Usually | Medically necessary emergency ambulance transportation is generally covered, although deductibles, copays or coinsurance may apply. |
Chiropractic care | Sometimes | Some plans cover a limited number of medically necessary chiropractic visits, while others exclude routine chiropractic care. |
Dental care | Limited | Adult medical plans generally don't cover routine dental services. Pediatric dental care is an essential health benefit under the ACA. |
Dermatologist visits | Usually | Medically necessary dermatology care is generally covered. Cosmetic treatments usually aren't. |
Eye exams | Sometimes | Medical eye care may be covered, but routine adult vision exams often require separate vision coverage. |
Hearing aids | Sometimes | Coverage varies by plan and state. Some plans cover hearing exams but exclude or limit hearing aid benefits. |
Physical therapy | Usually | Rehabilitation services such as physical therapy are an essential health benefit for Marketplace plans, although visit limits or prior authorization may apply. |
Therapy | Usually | ACA-compliant plans cover mental health and substance use disorder services, including outpatient therapy, subject to the plan's network and cost-sharing rules. |
WHAT IS A PRESCRIPTION DRUG FORMULARY?
A prescription drug formulary is the list of medications your health insurance plan covers. Insurers usually divide covered drugs into tiers that determine how much you pay. Lower tiers contain lower-cost generic drugs, while higher tiers include brand-name and specialty medications with higher copays or coinsurance.
Your formulary can also tell you whether a drug requires prior authorization, step therapy or has quantity limits. If your medication isn't covered, ask your doctor about a covered alternative or whether you can request a formulary exception. Check a plan's formulary before enrolling if you take regular prescriptions.
How to Get Health Insurance
Employer plans, the Health Insurance Marketplace, Medicaid, Medicare and direct insurer purchases are your main coverage sources, each with its own eligibility rules and enrollment windows.
Job loss opens a 60-day Special Enrollment Period to buy a Marketplace plan. COBRA keeps your group coverage active after leaving a job, but you'll pay the full premium plus a 2% administrative fee. Costs and covered benefits differ enough between sources that comparing options before you commit can save you hundreds per year.
Employer-Sponsored Insurance | Your employer covers part of the premium, and you pay the remaining share for yourself and any dependents. You can sign up during your company’s open enrollment period or within 30 days of starting a new job. If you’re under 26, you may be added to a parent or guardian’s employer plan. Reach out to your HR team to review eligibility and available plan options. |
Health Insurance Marketplace | You can get coverage through HealthCare.gov by creating an account and completing an application. To start coverage on January 1, enroll by December 15. If you enroll between December 16 and January 15, 2026, coverage begins February 1. Certain life events, such as losing coverage, moving, getting married or having a baby, allow you to enroll outside the standard window. Many applicants qualify for premium tax credits based on income. |
Medicaid and CHIP | Medicaid and Children's Health Insurance Program offer low-cost or no-cost coverage for those who meet eligibility requirements. Qualification depends on factors like income, household size, disability and age. You can apply through HealthCare.gov or your state Medicaid office. If you appear eligible, your application is sent to your state for review. Children may qualify for CHIP even if their parents do not meet Medicaid requirements. |
Medicare | Medicare is federal health insurance for people 65 and older. You qualify at age 65 if you’re a U.S. citizen or a permanent legal resident who has lived in the country for at least five continuous years. If you begin receiving Social Security retirement benefits before turning 65, enrollment in Medicare Part A and Part B happens automatically at that time. You can join, change or drop a Medicare Advantage plan or prescription drug plan during set enrollment periods. For assistance, contact Social Security at 1-800-772-1213 or visit Medicare.gov. |
Direct from Insurance Companies | You can buy private health insurance directly from insurers such as Blue Cross Blue Shield, UnitedHealthcare or Aetna, or through a licensed agent or broker. These plans don’t include Marketplace financial assistance and may leave out benefits like maternity care or mental health services. Contact insurers or work with an agent to review your options and enroll. |
How Much Health Insurance Should You Get?
The right amount of health insurance depends on how often you expect to need care and how much cost you’re willing to take on. Plans in the ACA marketplace come in four metal tiers, each offering a different mix of monthly premiums and out-of-pocket expenses. Lower-premium plans keep monthly costs down but leave you paying more when you receive care. Higher-premium plans cost more each month but reduce what you pay when you use medical services.
- 1Match the plan to your health needs
If you take prescription drugs or see specialists regularly, a Gold or Platinum-tier plan on HealthCare.gov costs less over the year for most people. Bronze and Silver-tier plans are better suited for people who rarely need care and want lower monthly costs.
- 2Weigh the premium vs. deductible tradeoff
Your deductible is what you pay before your health plan starts covering costs. Bronze-tier plans carry deductibles above $5,000 for individuals. But Gold-tier plans have lower deductibles, with higher monthly premiums to offset the difference. Compare what each tier costs at different levels of care use before enrolling.
- 3Focus on total cost, not just the monthly premium
Add your annual premium to your expected out-of-pocket costs. In 2026, ACA marketplace plans cap annual out-of-pocket spending at $10,600 for an individual and $21,200 for a family, per HealthCare.gov. So that ceiling is the most you'll pay in any plan year.
- 4Compare plans using HealthCare.gov's tools
HealthCare.gov's plan comparison tool shows premiums, deductibles, copays and out-of-pocket maximums side by side. Use the cost estimator to model your expected annual spending across plan tiers.
- 5Don't miss open enrollment
HealthCare.gov's open enrollment runs November 1 through January 15 each year. Miss that window and you'll need a qualifying life event, such as job loss, marriage or the birth of a child, to enroll outside it.
How Health Insurance Works: Bottom Line
Understanding how health insurance works starts with knowing your costs. You pay monthly premiums, meet a deductible, then share remaining costs through copays or co-insurance. Marketplace plans must cover 10 essential health benefits by law. Match your plan tier to how much care you expect to use and you'll spend less overall.
Frequently Asked Questions
We've answered common questions about how health insurance works:
Your employer pays part of your monthly premium, and the rest comes out of your paycheck. Enroll during open enrollment or within 30 days of starting a new job. You can add dependents to your plan. If you're under 26, a parent's employer plan may cover you.
You can get individual health insurance through HealthCare.gov, directly from insurers like Blue Cross Blue Shield, UnitedHealthcare or Aetna, or through a licensed broker. Marketplace plans may qualify for premium tax credits based on your income. Plans bought directly from insurers don't qualify for tax credits and may not include essential health benefits.
Marketplace and employer plans can't deny coverage or charge more because of a pre-existing condition. ACA-compliant plans sold through HealthCare.gov can't impose annual or lifetime dollar limits on essential health benefits. Plans bought directly from insurers outside the Marketplace may not have the same protections, so check plan details before enrolling.
You have 60 days after losing job-based coverage to enroll in a Marketplace plan through a Special Enrollment Period. COBRA lets you keep your former employer's plan, but you'll pay the full premium plus a 2% administrative fee. Compare COBRA costs against Marketplace options before deciding.
Out-of-network coverage depends on your plan type. PPO plans cover out-of-network care but charge higher co-insurance, often 40% compared to 20% in-network. HMO and EPO plans don't cover out-of-network care except in emergencies. Check whether a provider is in-network before scheduling care to avoid higher costs.
Coordination of benefits applies when you're covered under more than one health plan. One plan is primary and pays first. The second plan may cover some or all remaining costs, which can lower your out-of-pocket spending. Contact both insurers to confirm which plan pays first before receiving care.
You can stay on your parent's health insurance plan until age 26 under the Affordable Care Act, even if you're married, financially independent, living away from your parents or eligible for coverage through your own employer. Coverage ends when you turn 26, although the exact termination date depends on the plan.
Yes. You can have more than one health insurance policy at the same time. One plan becomes your primary insurance and processes claims first, while the other is secondary and may pay some remaining covered costs. Coordination of benefits rules determine which plan pays first, and you still have to pay the premiums for both policies.
Most employer and Marketplace health plans don't allow you to add a parent as a dependent, even if you financially support them. Employer plans limit dependent coverage to spouses and children. Your parents may instead qualify for their own Marketplace plan, Medicare or Medicaid based on their age, income and eligibility.
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About Mark Fitzpatrick
Mark Fitzpatrick, a licensed Property and Casualty (P&C) Insurance Producer in Connecticut, is MoneyGeek's resident expert in insurance and economics. He has spent nearly a decade covering the insurance market at LendingTree and MoneyGeek. There, he has analyzed hundreds of carriers and millions of rates across auto, home, renters, health and life insurance.
His work has appeared in The Washington Post, The New York Times and NPR. He draws on independent cost and consumer experience data, and no insurance company partnerships affect his recommendations.
Mark studied at Boston College and later earned a master's in economics and international relations from Johns Hopkins University. He worked in financial risk management at State Street before joining MoneyGeek. He's also a five-time “Jeopardy!” champion.