- FCDO guidance tells travellers to declare existing conditions, pending treatment or tests, and warns that failing to declare something may invalidate travel insurance.
- An undiagnosed condition is one where symptoms are present but no diagnosis has been confirmed, for example while awaiting tests, results, or a specialist referral.
- Specialist medical insurers can often still issue a policy where a diagnosis is pending, but claims arising from the undiagnosed condition itself are typically excluded.
- ABI members paid 472 million pounds across more than 500,000 travel claims in 2024, with medical claims of 262 million pounds and an average medical claim of 1,528 pounds.
- One ABI member paid more than 1 million pounds for a customer admitted to hospital in the USA who needed repatriation to the UK.
An undiagnosed condition is not the same as having no condition. FCDO guidance is explicit that travellers should declare existing conditions and pending tests, and that failing to declare something may invalidate a policy. Treating a quote screen as a chance to omit symptoms you are being investigated for carries the risk of a declined claim.
How cover for undiagnosed conditions differs
Standard travel insurance is priced on the assumption that a traveller is in settled health. The medical screening questions on a typical policy ask about diagnosed conditions, medication, and recent treatment. An undiagnosed condition sits awkwardly in that framework: there is a known problem, often symptoms serious enough to prompt investigation, but no confirmed diagnosis to declare in the usual way.
This matters because the entire purpose of medical screening is to let an insurer price the risk of a claim arising from a known health issue. Where a diagnosis is pending, the insurer cannot reliably assess the likelihood of a complication abroad. The common industry response is not to refuse the traveller outright, but to issue a policy while excluding claims that arise from the undiagnosed condition and anything connected to it. Cover for unrelated events, such as a broken ankle, a delayed flight, or lost baggage, can remain in place.
The Foreign, Commonwealth and Development Office frames the traveller's duty plainly. Its guidance states that you should declare existing conditions or pending treatment or tests so that you are covered if there are related complications during your trip, and that failing to declare something may invalidate your travel insurance. Pending tests are named directly, which removes any ambiguity about whether a condition under investigation needs to be disclosed.
What to look for
The first thing to look for is an insurer that accepts declarations of undiagnosed symptoms at all. Many mainstream policies sold through a quick online form have no mechanism to capture symptoms under investigation, which effectively pushes that risk back onto the traveller. Specialist medical insurers tend to handle these cases by telephone, where an adviser can record the symptoms, any tests booked, and any results being awaited.
Second, read how the policy treats the undiagnosed condition itself. A workable policy is usually one that confirms cover for unrelated medical emergencies and unrelated cancellation while excluding only claims linked to the symptoms, tests, or investigations you are awaiting. That boundary, what is excluded versus what remains live, is the single most important detail to confirm before purchase.
Third, check the medical cover limit and the cancellation limit, because these are what actually pay out if an unrelated emergency occurs abroad. FCDO guidance advises confirming that a policy covers the full length of the trip, treatment in state or private hospitals, and emergency transport such as an ambulance, which is often charged separately from other medical expenses. Emergency travel home on medical grounds can be very expensive, and the ABI's largest reported single travel claim of more than 1 million pounds related to a USA hospitalisation and repatriation.
Cover limits and exclusions
The defining exclusion in this segment is the undiagnosed-condition exclusion. As a worked example, Staysure's published position is that it cannot cover claims related to an undiagnosed condition, meaning any medical issues linked to symptoms, tests, or investigations you are awaiting results for are not covered, while medical emergencies and cancellations that are not linked to the undiagnosed condition remain covered, alongside non-medical claims such as travel delays, lost or damaged baggage, lost money, and passports. That structure, exclude the undiagnosed condition, keep everything unrelated, is the pattern to expect across specialist providers rather than a single-brand quirk.
Two further exclusions commonly appear. Cruises generally require an additional level of cover because it is more difficult to reach hospital for treatment, so a cruise booking should be flagged at the point of quote. Adventurous activities and some sports may need specialist insurance or an add-on. Neither is specific to undiagnosed conditions, but both can interact with a medical exclusion to leave a larger gap than a traveller expects.
It is also worth separating insurance from state healthcare entitlement. A UK Global Health Insurance Card (GHIC) is free and lasts up to five years, and it covers medically necessary state healthcare in the EEA and some other countries. It does not cover repatriation, treatment in a private facility, or ski and mountain rescue, and the NHS states plainly that it is not a replacement for travel insurance. Some insurers waive the medical excess where an EHIC or GHIC is used, so the policy terms are worth checking on that point.
Providers offering cover in this segment
Naming providers in this category requires caution, because the relevant question is not whether a brand sells medical travel insurance, but whether it accepts a declaration where a diagnosis is still pending. Many insurers in the wider medical-conditions market quote only on confirmed diagnoses and have no route for symptoms under investigation.
Staysure is one verifiable example of a provider that engages with undiagnosed cases. Staysure is a trading name of TICORP Limited, registered in Gibraltar (company number 111526), which trades into the UK on a freedom of services basis and carries Financial Conduct Authority reference number 663617. Its broader medical proposition covers more than 1,300 conditions with no upper age limit, and on undiagnosed cases its published approach is to take the declaration by telephone rather than through an online form, because the complexity of a pending diagnosis does not fit a standard quote screen. The same provider confirms cancellation cover up to 15,000 pounds and, on its Comprehensive and Signature policies, unlimited emergency medical cover.
Beyond named providers, the practical category to search for is specialist medical travel insurers that operate telephone-based medical screening. Those are the ones equipped to record symptoms, booked tests, and awaited results, and to confirm in writing which parts of the cover remain live. A provider that cannot capture an undiagnosed declaration at all is not a safe choice for this situation, regardless of headline price.
Common pitfalls
The most damaging pitfall is non-disclosure. Because an undiagnosed condition has no formal diagnosis, it is tempting to treat the online questions as not applicable and proceed. FCDO guidance directly contradicts that reading: pending tests should be declared, and failing to declare may invalidate the policy. A claim that is later traced to the undeclared symptoms can be refused even where it would otherwise have been paid.
A second pitfall is assuming that the undiagnosed-condition exclusion voids the whole policy. In a correctly structured specialist policy it does not. Unrelated emergencies and unrelated cancellation can still pay out, which is precisely why declaring the condition and accepting the targeted exclusion is usually better than buying a cheaper policy that has no provision for the situation at all.
A third pitfall is leaving the purchase too late. If symptoms worsen or a diagnosis is confirmed before departure, the position can change, and an insurer may need to re-screen or may decline. Cancellation cover is generally only useful if the policy is in force before the event that triggers the cancellation, so buying early, with full disclosure, protects the cancellation element as well as the medical element.
Finally, travellers sometimes confuse the GHIC with insurance. The card helps with state treatment in covered countries but pays nothing toward repatriation or private care, and the cost of an unrelated emergency abroad can run far beyond what any state system reimburses. The card and a properly declared insurance policy do different jobs.
If you find it difficult to get cover because of a pre-existing condition, the Money and Pensions Service operates a travel insurance directory of specialist providers via its MoneyHelper service. Visit the MoneyHelper travel insurance directory or call the Money Helper Customer Contact Centre on 0800 138 7777 (Monday to Friday, 8am to 6pm).
Sources
- GOV.UK / FCDO, Foreign travel insurance guidance
- Association of British Insurers, travel insurance claims data (published 21 August 2025)
- NHS, Apply for a free UK Global Health Insurance Card (GHIC)
- Staysure, Travel Insurance for Undiagnosed Medical Conditions
- Staysure, Travel Insurance product page and regulatory information
- MoneyHelper, travel insurance directory
