Surprise medical bills used to be treated as an unavoidable part of getting care. Recent law in both countries makes that a lot less true.
It's much harder for them to than it used to be, in both countries. In the US, the No Surprises Act, in effect since January 2022, requires providers to give uninsured or self-pay patients a written Good Faith Estimate of expected costs before non-emergency care. If your actual bill comes in $400 or more above that estimate, you have the right to formally dispute it. In the UK, private clinics operate under Competition and Markets Authority rules requiring clear, upfront pricing information before you agree to treatment — and NHS care remains free at the point of use in any case, so an unexpected charge there would be unusual to begin with.
| United States | United Kingdom | |
|---|---|---|
| Legal basis | No Surprises Act (effective January 2022) | NHS care is free at point of use; private care is governed by the CMA's Private Healthcare Market Investigation Order |
| What providers must disclose | A written Good Faith Estimate of expected charges for uninsured/self-pay patients, covering the primary service plus reasonably related costs (tests, equipment, hospital fees) | Clear, accurate cost information before treatment, including any additional fees that might apply — CMA rules specifically target hidden or unclear private healthcare pricing |
| Timeline for the estimate | Within 3 business days of a request, or a set number of days after scheduling, depending on how far in advance the appointment is booked | No fixed statutory number of days, but pricing must be clear and provided before you consent to treatment |
| What you can do if the bill exceeds the estimate | Dispute the bill through the No Surprises Act's independent dispute resolution process if it's $400 or more above the Good Faith Estimate | Challenge the charge as a breach of the CMA order and/or as an unfair contract term if it wasn't disclosed before you agreed to treatment |
| Insured patients | Separately protected against surprise out-of-network billing for emergency care and certain situations at in-network facilities | Not typically relevant — NHS treatment doesn't involve billing in this way for the vast majority of care |
Worth noting: the Good Faith Estimate requirement in the US currently applies fully to uninsured and self-pay patients. The equivalent protection for insured patients — an "advanced explanation of benefits" showing what you'd owe before treatment — has been the subject of ongoing regulatory work and hasn't been fully implemented in the same way, so insured patients should check what protections currently apply to their specific situation.
If you asked for a cost estimate before care and never received one, and the eventual bill is a genuine surprise, that alone is worth raising as a Good Faith Estimate compliance issue in the US.
A gap of $400 or more between the estimate and the final bill isn't something to simply accept — it's specifically the threshold the dispute process exists for.
In the UK, this is precisely what the CMA's cost-transparency rules for private healthcare were designed to prevent — a charge that wasn't part of any pricing you were shown or agreed to beforehand is worth challenging directly.
Disputing a US bill that exceeds the Good Faith Estimate:
"My final bill of [amount] is more than $400 above the Good Faith Estimate I received of [amount] on [date]. I'd like to initiate the dispute resolution process under the No Surprises Act."
Challenging an undisclosed charge at a UK private clinic:
"I wasn't given clear pricing information for this charge before I agreed to treatment. Can you confirm when and how this was disclosed to me, in line with the CMA's private healthcare pricing rules?"
Use Kibbo's Healthcare & Medical tools to put your dispute in writing, citing the exact right your bill may be in breach of.
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