Commercial health insurance is medical coverage sold by private companies rather than provided through government programs like Medicare or Medicaid. You get it one of three ways: through an employer, by buying an individual plan on the ACA marketplace, or directly from an insurer. Plans differ in what you pay, which doctors you can see, and how much paperwork stands between you and specialist care, but federal law sets a floor of protections that applies to almost all of them.
How Private Insurers Make Money and Set Prices
Insurers collect premiums, pool the money, and pay members’ medical claims out of that pool. They price policies based on claims history, demographics, and actuarial projections, aiming to bring in enough to cover expected payouts, administration, and profit. Federal law limits how much can go to anything other than care: the medical loss ratio rule requires insurers to spend at least 80% of premium revenue on medical care and quality improvement for individual and small-group plans, and at least 85% for large-group plans. Shortfalls come back to policyholders as rebates.1HealthCare.gov. Rate Review and the 80/20 Rule
Two pieces of an insurer’s operation drive most of what you’ll actually experience as a member. The first is the provider network. Insurers negotiate rates with doctors and hospitals in advance, and staying in-network is one of the most reliable ways to control your costs. The second is the formulary, a tiered list of covered prescription drugs. A generic on the preferred tier might cost a $10 copay, while a brand-name drug on a higher tier could run hundreds.
What Every Commercial Plan Has to Cover
Under the Affordable Care Act, individual and small-group plans must cover ten categories of essential health benefits:2Office of the Law Revision Counsel. 42 US Code 18022 – Essential Health Benefits Requirements
- Outpatient care
- Emergency services
- Hospital stays
- Maternity and newborn care
- Mental health and substance use disorder treatment
- Prescription drugs
- Rehabilitative and habilitative services and devices
- Lab tests
- Preventive and wellness services, plus chronic disease management
- Pediatric services, including dental and vision for children
Plans also have to cover preventive services (annual checkups, certain cancer screenings, immunizations) at no cost when you use an in-network provider, and they can’t put annual or lifetime dollar caps on essential benefits. Large-group employer plans aren’t technically bound by the essential health benefits list, but most offer comparable coverage in practice.
The Main Plan Types
Commercial plans come in a handful of structures. The differences reduce to three questions: how tightly is your choice of provider controlled, do you need a referral to see a specialist, and what happens if you go outside the network?
HMO (Health Maintenance Organization)
HMOs keep costs low by keeping control tight. You pick a primary care physician who acts as a gatekeeper. Seeing a specialist requires a referral. Care outside the network isn’t covered except in genuine emergencies, so if you go out of network on your own, you’ll likely pay the entire bill.3HealthCare.gov. Health Insurance Plan and Network Types: HMOs, PPOs, and More Premiums and out-of-pocket costs tend to be the lowest of any plan type.
PPO (Preferred Provider Organization)
PPOs give you more freedom. You can see any provider, including specialists, without a referral. The plan still has a preferred network where you pay less, but going out of network doesn’t mean paying everything yourself; your plan will cover some portion, though your deductible, copays, and coinsurance will be higher. PPO premiums are typically the highest among standard plan types.
POS (Point-of-Service) Plan
POS plans sit between HMOs and PPOs. You pick a primary care doctor and need referrals for specialists, HMO-style, but you can go out of network if you’re willing to pay more. Premiums usually land in between as well.
EPO (Exclusive Provider Organization)
EPOs pair a strict network with no referral requirement. Like an HMO, you generally must stay in-network (emergencies excepted). Like a PPO, you can usually see any in-network specialist directly. Premiums often look more like an HMO’s than a PPO’s.
High-Deductible Plans and HSAs
A high-deductible health plan trades a bigger deductible for a smaller monthly premium. For 2026, a plan qualifies as an HDHP if its deductible is at least $1,700 for individual coverage or $3,400 for family coverage, and its out-of-pocket costs (excluding premiums) can’t exceed $8,500 for an individual or $17,000 for a family.4Internal Revenue Service. Expanded Availability of Health Savings Accounts Under the One, Big, Beautiful Bill Act
The bigger draw is what an HDHP unlocks: a Health Savings Account. HSA contributions are tax-deductible (even if you don’t itemize), the money grows tax-free, and withdrawals for qualified medical expenses are tax-free. For 2026, you can contribute up to $4,400 for individual coverage or $8,750 for family coverage; if you’re 55 or older, you can add $1,000 in catch-up contributions.4Internal Revenue Service. Expanded Availability of Health Savings Accounts Under the One, Big, Beautiful Bill Act Balances roll over year to year and stay with you if you change jobs. HDHPs work best if you’re generally healthy or have enough savings to cover the deductible if something goes wrong.
Employer Coverage vs. Buying Your Own
Employer-sponsored insurance is the most common form of commercial coverage. Employers negotiate group rates, pick up a substantial share of the premium, and let you pay your portion pre-tax through payroll. That combination makes it substantially cheaper than the sticker price suggests. The downside is that the coverage ends when the job does.
Federal law lets you continue an employer plan temporarily through COBRA after losing coverage, but you pay the full premium plus a 2% administrative fee, up to 102% of the total cost.5eCFR. 26 CFR 54.4980B-8 – Paying for COBRA Continuation Coverage You have 60 days to elect COBRA, and it lasts up to 18 months after a job loss or reduction in hours. Some qualifying events, like a spouse’s death or divorce, allow dependents up to 36 months of continuation coverage.6U.S. Department of Labor Employee Benefits Security Administration. FAQs on COBRA Continuation Health Coverage for Workers
Individual plans, bought through healthcare.gov, a state exchange, or directly from an insurer, stay with you regardless of your job. Premiums run higher than employer coverage since no one is subsidizing them, but income-based Premium Tax Credits can bring costs down significantly for eligible households. Households between 100% and 400% of the federal poverty level generally qualify, though eligibility has shifted in recent years and current specifics depend on the latest legislation.7Internal Revenue Service. Updates to Questions and Answers About the Premium Tax Credit
When You Can Enroll
You can’t buy commercial coverage whenever you want. Plans use an annual open enrollment window, typically in the fall for coverage starting January 1. Outside that window, you need a qualifying life event: marriage, a new baby, or losing job-based coverage, among others. Most events give you 60 days to enroll in a marketplace plan.8HealthCare.gov. Getting Health Coverage Outside Open Enrollment
What Insurers Can and Can’t Do With Your Rate
In the individual and small-group markets, insurers can only vary premiums based on four factors: your age, where you live, tobacco use, and family size. Older adults can be charged up to three times what younger adults pay for the same plan, and tobacco users can face premiums up to 1.5 times higher.9Centers for Medicare & Medicaid Services. Market Rating Reforms Medical history is off the table; insurers can’t deny you or charge more because of a pre-existing condition.
Consumer Protections You Should Know
Every ACA-compliant plan has to cap your annual out-of-pocket spending. For 2026, that ceiling is $10,150 for individual coverage and $20,300 for family coverage. Once you hit it, the plan covers 100% of in-network costs for the rest of the year.
Federal law has also banned most surprise medical bills since 2022. Emergency care at an out-of-network hospital or from an out-of-network doctor can’t cost you more than you’d pay in-network for the same services. The insurer and provider settle up between themselves. The protection also applies when you go to an in-network hospital but get treated by an out-of-network provider you didn’t choose, like an anesthesiologist or radiologist.10Office of the Law Revision Counsel. 42 US Code 300gg-111 – Preventing Surprise Medical Bills
Insurers also can’t require prior authorization for emergency care, and whether something counts as an emergency is judged by your symptoms at the time, not by the final diagnosis. One gap worth flagging: ground ambulance services are not covered by the No Surprises Act, so a surprise bill from an out-of-network ambulance company is still possible.11Centers for Medicare & Medicaid Services. No Surprises Act Overview of Key Consumer Protections
State insurance departments layer on their own rules. Many states mandate coverage that goes beyond federal essential health benefits, such as infertility treatment, autism therapy, or chiropractic care. Requirements vary widely by state.
When a Claim Gets Denied
Providers usually file claims with your insurer directly. Denials come for a variety of reasons: a billing code mismatch, a decision that treatment wasn’t medically necessary, missing prior authorization, or a service not covered by your plan. When it happens, you have a federally guaranteed right to appeal in two stages. First is an internal appeal, which the insurer must route to someone who wasn’t part of the original denial. If that fails, you can request an external review by an independent third party, and the reviewer’s decision is binding on the insurer.12eCFR. 45 CFR 147.136 – Internal Claims and Appeals and External Review Processes
Records matter. Save every explanation of benefits, denial letter, and piece of correspondence. If medical necessity is in play, ask your doctor for a letter explaining why the treatment was appropriate. Most people never appeal, which is part of why the external review process exists.