Out-of-network anesthesia at an in-network hospital

You had surgery or a procedure at a hospital in your plan's network. Then a separate bill came from the anesthesia provider, marked out-of-network. You never chose that provider, and the bill is far more than you expected.

If you have private health insurance, federal law likely limits what you owe to your in-network share. This guide explains how, and what to do about the bill. It's part of our guide on how to appeal an insurance denial.

Why do out-of-network anesthesia bills happen?

The hospital and the doctors who work there often have separate contracts with your plan. So the hospital can be in your network while the anesthesia group isn't. Here's how a bill like this usually happens:

• Separate networks. The anesthesia group doesn't have a contract with your plan, even though the hospital does.
• No real choice. You may not meet your anesthesia provider until the day of your care. You often don't get to pick one in your network.
• A claim processed the wrong way. Your plan may treat the claim as out-of-network instead of applying the No Surprises Act (NSA).
• A bill sent too early. The provider may bill you before your plan finishes the claim.
• Coverage the law doesn't reach. Some plans and settings fall outside the law. We cover those below.

How does the No Surprises Act protect you?

The No Surprises Act took effect on January 1, 2022. It protects people with most private health insurance. That includes employer plans, Marketplace plans, and plans you buy on your own.

The law covers care from out-of-network providers during a visit to an in-network facility. For non-emergency care, that means a hospital, a hospital outpatient department, a critical access hospital, or an ambulatory surgical center. An ambulatory surgical center is a stand-alone surgery center.

Anesthesia gets extra protection. Federal rules treat it as an ancillary service, like radiology and lab work. That means:

• The protection always applies. Anesthesia providers at an in-network facility can't ask you to sign away your rights.
• A signed form doesn't change it. CMS guidance says a consent form for these services is invalid, even if you signed it.
• Nurse anesthetists count too. The rule covers anesthesia services from doctors and non-physician practitioners alike.

Emergency care has its own protection. If you got anesthesia during emergency care, the provider also can't charge you more than your in-network share.

What do you owe instead?

When the law applies, you pay only your in-network share. That's your usual copay, coinsurance, and deductible. Your plan pays the anesthesia provider directly, and the provider can't bill you for the rest.

Your plan figures your share from a set amount, not the provider's full charge. Unless a state law or a special state agreement applies, that's the lower of 2 amounts:

• The provider's billed charge
• The qualifying payment amount, which is generally based on the median in-network rate for that service in your area

What you pay counts toward your in-network deductible and out-of-pocket limit. It works the same as if the provider were in your network.

Say Maya has knee surgery at an in-network hospital on May 6, 2026. Her surgeon is in her network, but the anesthesiologist isn't. Maya has already met her deductible, and her plan's coinsurance is 20%.

Step	Amount
The anesthesiologist's charge	$3,000
The amount her plan uses to figure her share	$1,800
Maya's 20% coinsurance	$360
What her plan paid the anesthesia group	$1,440
The group's bill to Maya ($3,000 − $1,440)	$1,560
What Maya owes under the No Surprises Act	$360
The balance bill she doesn't have to pay	$1,200

Maya's explanation of benefits (EOB) shows she owes $360. She calls the anesthesia group and asks for a corrected bill of $360. If the group wants more money, it has to settle that with her plan. Her share stays $360.

When might these protections not apply?

The law has limits. Check these before you dispute a bill.

• Medicare and Medicaid. The law's billing rules don't apply to Medicare, Medicare Advantage, Medicaid, the Children's Health Insurance Program (CHIP), TRICARE, the Indian Health Service, or Veterans Affairs. These programs have their own protections against balance bills.
• Some types of coverage. The protections don't apply to short-term plans, health care sharing ministries, retiree-only plans, or fixed indemnity plans.
• Other settings. The law doesn't cover non-emergency care at an out-of-network facility. It also doesn't cover a doctor's office that isn't a hospital outpatient department.
• Care your plan doesn't cover. The rule applies when your plan covers the service. If your plan excludes the procedure, you may owe more.

If you have Original Medicare, providers who accept assignment can charge you only the Medicare deductible and coinsurance. Providers who don't can charge more. In many cases, they can't charge more than 15% above the Medicare-approved amount.

If you have Medicaid, providers must accept Medicaid's payment, plus any required cost sharing, as payment in full. Call your plan or your state Medicaid office if an anesthesia provider bills you more.

Your state may have its own surprise billing law, too. State rules may add more protections.

What to do if you get an out-of-network anesthesia bill

1. Don't pay the extra amount. Compare the bill with your EOB. When the law applies, the bill should match your share on the EOB. Some EOBs include a note that the claim falls under the No Surprises Act. Our guide to denial codes on your EOB explains common codes and notes.
2. Call the anesthesia provider's billing office. Say the care was at an in-network facility and the No Surprises Act applies. Ask for a corrected bill, and ask them to hold your account while they check.
3. Call your insurer. Ask whether it processed the claim under the No Surprises Act. If it used out-of-network cost sharing, ask it to reprocess the claim.
4. Put it in writing. Our surprise bill dispute letter gives you the words. Keep a copy.
5. Contact the No Surprises Help Desk. Call 1-800-985-3059, or submit a complaint online. Have your bill, your insurance card, your EOB, and any consent form you signed.
6. Appeal if your plan won't fix it. You can appeal a plan's decision to charge you out-of-network cost sharing. If your plan says no again, these denials can go to an independent external review.

Our guide on whether the No Surprises Act applies covers emergency care and air ambulances, too. If your plan denied the claim, see what to do when insurance didn't pay a medical bill. Our guide to external review for health insurance explains the last step.

When to get help

You can often fix an out-of-network anesthesia bill with a call to the provider and your insurer. It's worth getting help when:

• The provider won't correct the bill, or keeps sending it.
• Your insurer processed the claim as out-of-network and won't change it.
• The bill has gone to collections.
• You're not sure whether your plan or your setting is covered.

The No Surprises Help Desk, at 1-800-985-3059, answers questions and takes complaints. Your state insurance department can explain your state's surprise billing law. Your state's consumer assistance program, if it has one, can help with appeals.

If you have Medicare, call 1-800-MEDICARE (1-800-633-4227). A medical bill advocate can also make the calls for you. For a large bill or a collection lawsuit, an attorney can explain your options.