The classic American surprise bill works like this. You check that the hospital is in your network. You have the surgery. Weeks later a bill arrives from an anaesthesiologist you never met, who turns out to be out of network, for thousands of dollars your insurer will not cover.
Since 1 January 2022, that bill is largely illegal.
What is protected
The No Surprises Act bans balance billing — charging you the gap between what your insurer paid and the provider's full charge — in three situations:
- Emergency care, at any hospital, in or out of network. You cannot be expected to compare networks during an emergency, so the law says you pay your in-network cost share and no more.
- Out-of-network providers working at an in-network facility. This is the anaesthetist, the radiologist, the pathologist, the assistant surgeon — the people you never selected. Your cost is capped at the in-network share.
- Air ambulance transport from an out-of-network provider.
Where the law applies, the provider and the insurer settle the difference between themselves through an independent dispute process. You are out of it.
What is not protected
The gaps matter as much as the coverage:
- Ground ambulance is not covered by the federal law. Some states have their own protections; many do not.
- Care you knowingly chose out of network, having been given proper notice and having signed a consent form. Read anything you are asked to sign at admission — a consent to out-of-network care can waive the protection for some non-emergency services.
- Being uninsured is a different situation with a different remedy — the good-faith estimate and its dispute process, not this law.
If a surprise bill arrives anyway
They still arrive, usually by error rather than design. Do not pay it first and argue later.
- Ask the provider for an itemised bill and put your objection in writing, naming the No Surprises Act.
- Call your insurer and ask them to reprocess it at the in-network rate.
- If it does not resolve, the federal government runs a No Surprises Help Desk and a complaints process, and your state insurance regulator may also have jurisdiction.
Keep dates, names and copies. Most of these are resolved by a patient who simply did not go away.