When you got your health insurance card, you probably didn’t think much about it. It has a logo, a member ID, and a phone number. That’s it.
But health insurance in the US is not at all simple. Two people can have similar looking cards, but two completely different types of policies which determine what laws protect you, who pays your claims, and what you can do when a bill is wrong.
All health coverage in the US falls into one of two categories: government programs or commercial insurance.
Government health programs are run by federal/state agencies and paid for by taxpayers.
These programs are often administered through third-parties you’re familiar with (e.g. UnitedHealthcare, Cigna, Aetna, Humana, etc.) but the government is the one pulling the purse strings, so the rules, benefits, and billing protections are set by law.
If you are on Medicare or Medicaid, the process for disputing a bill is found in a separate guide because it’s different from what is described below. This article focuses on commercial insurance.
Commercial insurance is private and you get it through an employer or you buy it yourself. There are 4 different types of commercial insurance, and the most common is the self-insured plan.
The experience is similar across all 4 types:
From the outside, these plans look the same. Same card. Same carrier logo. Same network. The difference only shows up when you run into a problem with a medical bill - who you appeal to and what steps you take - depends on who is funding your plan and what type of law regulates it.
Individual, Family,SHOP, and Fully-Insured Plans. You or your employer pays a monthly premiumto an insurance carrier. In exchange, the carrier agrees to pay your medical claims. The carrier takes on all the financial risk. If your claims end up costing more than the premiums, the carrier absorbs the loss. Your employer’s cost is fixed.
Because the carrier is a licensed insurance company, your state can regulate it. That means state laws — including balance billing protections — apply to your plan.
Self-Insured Plans. Your employer sets aside money in a fund and pays your medical claims directly out of that fund. There is no premium to a carrier. Your employer is the insurer. The carrier’s logo on your card is just an administrator — they process claims and maintain the network, but the money comes from your employer.
Because the plan is funded by the employer — not an insurance company — your state cannot regulate it. It falls under the federal law of Employee Retirement Income Security Act of 1974 (ERISA), which is administered and enforced by the US Department of Labor. State insurance rules do not apply.
The difference between plan types affects how much you owe, what protections you have, and what you can do when something goes wrong, like when you receive a balance bill.
Your plan type determines whether state law limits what they can charge you - and what you can do about it.
You call 911. An ambulance takes you to the hospital. Weeks later, a bill arrives for $2,800. Your insurer says the ambulance was out-of-network. You had no way to check that in an emergency.
About 20 states have laws that cap what ambulance companies can charge in this situation. If you are on a fully insured plan and your state has one of these laws, the provider cannot bill you more than your in-network rate. The insurer and ambulance company sort out the rest between themselves.
On a self-insured plan, those state laws don’t apply. ERISA blocks them. You may still have options — an internal appeal, a direct negotiation with the provider — but the automatic legal cap that protects fully insured patients doesn’t exist for you. See below for an illustration of how the math works out.
Which states have protection? Read our full guide: Surprised By Your Ambulance Bill? Here's What You Can Do About It.
You have surgery at an in-network hospital with an in-network surgeon. Everything looks covered. Then a second bill arrives — from the anesthesiologist. They were out-of-network. You never met them. You had no say in who was assigned.
This is one area where self-insured plan members do have federal protection. The No Surprises Act covers facility-based providers like anesthesiologists. It applies to both fully insured and self-insured plans. The provider cannot bill you more than your in-network cost-sharing amount — regardless of their network status.
But the protection only works if your insurer processes the claim correctly. Many don’t. The bill may still arrive. You may still need to dispute it. Knowing the law gives you the standing to push back.
Read a real patient story and get a primer on how to dispute that surprise anesthesia bill.
Both plan types use the same cost-sharing tools - deductibles, copays, and coinsurance. But who sets those amounts - and who oversees them - is different.
On a fully insured plan, the carrier sets the allowed amounts.Your state reviews and approves them. If your insurer applies the wrong rate, you can file a complaint with your state insurance department.
On a self-insured plan, your employer sets those amounts.There is no state approval. No state regulator reviews the terms. Your path runs through the federal ERISA appeals process with the Department of Labor, not the state.
This is one reason why self-insured plan members often face higher surprise costs. The state safety nets don’t apply to them.
Both plan types give you the right to appeal a denied claim or dispute a billing error. But the process is different.
Individual, Family, SHOP, and Fully-Insured Plans. Your insurer must have an internal appeals process. After that, most states let you request an external review by an independent organization. You can also file a complaint with your state insurance department.
Self-Insured Plans. Your plan must have an internal appeals process, as required under ERISA. After that, you can request an external review. An independent organization reviews the case. Their decision is binding on your plan.
Your employer is the plan. That means HR or your benefits team can sometimes step in directly. They can push the plan’s administrator to reprocess a claim. Most employees don’t know this is an option.
For both plan types, the best first step is always the same. Get the itemized bill. Check it for errors. A corrected bill helps every step that follows.
