Moratorium and full medical underwriting are two common ways UK private health insurers decide which existing medical conditions will be excluded from a new policy.
Neither option is automatically better, and neither normally guarantees cover for conditions you already have. The main difference is when your medical history is assessed:
- Moratorium underwriting usually requires little medical information when you apply. The insurer investigates relevant history when you claim.
- Full medical underwriting requires you to answer detailed health questions at the beginning. The insurer then confirms any personal exclusions in writing.
| Feature | Moratorium underwriting | Full medical underwriting |
|---|---|---|
| Application | Usually quicker, with limited medical questions | Detailed medical declaration required |
| Exclusions known at the start | Not always; eligibility may be decided when you claim | Usually listed on the policy certificate |
| Claims process | May require investigation of previous symptoms and records | Can be clearer if exclusions were established in advance |
| Possible future cover for an old condition | May become eligible after a continuous symptom-and-treatment-free period | Only if the insurer removes or reviews the stated exclusion |
| Risk of forgetting medical details | Lower at application, but old records still matter at claim | Higher if questions are answered incompletely |
| Best suited to | People wanting a quick application and who understand the retrospective rules | People who want greater clarity about exclusions before buying |
For many buyers, full medical underwriting provides greater certainty. Moratorium underwriting is simpler to arrange and may allow some previous conditions to become eligible later, but the uncertainty can create delays or disputes when a claim is made.
Underwriting rules vary between insurers and products. Always read the exact definition of a pre-existing condition, look-back period and moratorium rules in the policy you are considering.
What is medical underwriting?
Medical underwriting is the process an insurer uses to decide which health risks it is willing to cover. It is separate from the general benefits and limits of the policy.
The insurer may consider:
- previous diagnoses;
- symptoms that existed before the policy started;
- medication and other treatment;
- GP and specialist appointments;
- tests, scans and referrals;
- planned or recommended investigations;
- ongoing monitoring;
- previous operations or injuries.
The outcome may be:
- standard cover with no personal exclusions;
- cover with one or more named exclusions;
- cover with broader exclusions for related conditions;
- cover at a higher premium in some circumstances;
- a request for more medical information;
- the application being declined.
Underwriting does not determine every aspect of a future claim. The insurer will still check whether the treatment is covered by the policy, medically necessary, authorised correctly and within financial or provider limits.
How does moratorium underwriting work?
With moratorium underwriting, you normally answer only a small number of general eligibility questions when applying. You do not usually complete a detailed declaration of every symptom, consultation and diagnosis.
Instead, the policy automatically excludes medical conditions falling within its moratorium definition. When you later claim, the insurer may examine your records to decide whether the new problem is pre-existing or related to an excluded condition.
A common UK arrangement considers medical problems for which, during the five years before joining, you:
- experienced symptoms;
- received medication;
- received treatment;
- sought or received medical advice;
- underwent tests or investigations.
Such conditions are initially excluded. They may become eligible if, after joining, you complete a continuous period—commonly two years—without symptoms, medication, treatment, diagnostic testing or medical advice relating to the condition.
This is often described as a five-year look-back with a two-year moratorium. It is common but not universal. Some policies use different wording, time periods or rules.
The insurer may request GP records when a claim is made. A quick application therefore does not mean that your previous health is irrelevant.
What does the two-year moratorium rule mean?
The two-year rule is frequently misunderstood. It does not usually mean that every pre-existing condition becomes covered automatically after you have paid premiums for two years.
Typically, the condition must remain completely free from specified activity for two continuous years after the policy begins. Depending on the wording, this may mean no:
- symptoms;
- medication;
- treatment;
- medical advice;
- tests or investigations.
If symptoms return or you seek advice during this period, the qualifying period may restart.
| Example | Possible outcome under a typical moratorium |
|---|---|
| Old ankle injury with no symptoms, treatment or advice throughout the first two policy years | A later new episode may become eligible, subject to the terms |
| Back pain reviewed by a physiotherapist after 18 symptom-free months | The two-year qualifying period may restart |
| Blood-pressure medication taken continuously | The condition has not completed a treatment-free period |
| Annual monitoring for a previous condition | Monitoring may count as advice, treatment or investigation |
| Symptoms existed before joining but diagnosis occurred afterwards | The condition may still be treated as pre-existing |
The precise relationship between the old condition and a new claim can be disputed. For example, an insurer may investigate whether new hip pain is related to earlier back symptoms or whether a new digestive diagnosis arose from symptoms documented before cover began.
Some chronic conditions are unlikely to complete a symptom-and-treatment-free period because they require continuing medication or monitoring. They may therefore remain excluded indefinitely.
How does full medical underwriting work?
Full medical underwriting, often abbreviated to FMU, requires a medical declaration when you apply. The insurer asks questions about your current and previous health.
You may need to disclose:
- diagnosed medical and mental-health conditions;
- unexplained or recurring symptoms;
- medicines and treatment;
- previous hospital admissions or surgery;
- specialist consultations;
- tests, scans or abnormal results;
- planned investigations;
- ongoing monitoring;
- time away from work because of illness.
The insurer reviews the information and usually issues a policy certificate or underwriting letter showing any personal exclusions.
For example, it might exclude:
- a named knee and related treatment;
- back and spinal conditions;
- a particular mental-health condition;
- disorders of a specified organ or body system;
- investigation or treatment related to a previous symptom.
The exclusion may be permanent or reviewable. If it can be reviewed, the insurer should explain when and what evidence will be required.
Occasionally an insurer may accept a previous condition, restrict the benefit or apply a premium adjustment. This depends on the insurer’s underwriting criteria and should never be assumed.
What are the main advantages and disadvantages?
| Underwriting method | Main advantages | Main disadvantages |
|---|---|---|
| Moratorium | Quick application; fewer health questions; no need to recall every detail immediately; some old conditions may become eligible later | Less certainty; medical records may be investigated at claim; claims can take longer; the qualifying period can restart |
| Full medical underwriting | Personal exclusions usually known before cover begins; greater certainty when comparing policies; potentially simpler claim assessment | Longer application; detailed disclosure required; exclusions may remain indefinitely; inaccurate answers may affect later claims |
Moratorium underwriting may appear more generous because an old condition could eventually become covered. In practice, continuing symptoms, prescriptions or monitoring may make the condition permanently unable to satisfy the policy’s two-year rule.
Full medical underwriting may appear stricter because exclusions are visible immediately. That visibility can nevertheless be useful: you know what you are buying before paying years of premiums.
The better option depends less on which method sounds favourable and more on how each insurer would treat your actual medical history.
How are pre-existing conditions treated?
A pre-existing condition may include more than a formal diagnosis. Policy definitions often include symptoms, even if you did not know their cause when the policy began.
Examples might include:
- recurrent abdominal pain documented before a later gallbladder diagnosis;
- knee pain before a scan identified arthritis;
- palpitations before atrial fibrillation was confirmed;
- low mood or anxiety symptoms before a formal mental-health diagnosis;
- abnormal blood results awaiting investigation when the policy started.
The insurer may also exclude conditions that it considers medically related to the declared or pre-existing problem. The breadth of “related conditions” is an important part of the policy wording.
Private medical insurance is generally intended to cover eligible new, acute conditions. Ongoing management of chronic conditions is commonly restricted or excluded even when the condition first arose after the policy began.
An acute episode associated with a chronic condition may sometimes be covered, but this depends on the policy. Always obtain authorisation before arranging private treatment.
Our guide to pre-existing conditions and private health insurance explains these exclusions in more detail.
Which option makes claims easier?
Full medical underwriting can make the claims process more predictable because personal exclusions have usually been assessed at the outset. The insurer still needs to determine whether the proposed treatment is eligible, but it may not need to reconstruct your medical history from scratch.
Under moratorium underwriting, the insurer may first need to establish:
- when symptoms began;
- whether you sought advice before joining;
- whether an earlier condition is related;
- whether you completed the qualifying symptom-free period;
- whether any medication, monitoring or treatment restarted the moratorium.
This can require:
- GP medical records;
- specialist letters;
- prescription history;
- physiotherapy or counselling records;
- test and scan reports;
- clarification from the treating consultant.
Moratorium claims are not inherently invalid or unfairly difficult. However, they contain more uncertainty because underwriting happens partly when the benefit is needed.
Before arranging treatment, contact the insurer, describe the symptoms honestly and obtain a claim or authorisation number. A consultant recommending treatment does not itself prove that the policy will pay.
See our practical guide to making a private health insurance claim.
What must you disclose under full medical underwriting?
Answer every health question accurately and completely using the information reasonably available to you. Do not decide that something is too minor or irrelevant if it falls within the question asked.
Potentially relevant information may include:
- symptoms that resolved without a diagnosis;
- appointments where no treatment was needed;
- over-the-counter treatment if the question includes it;
- private and NHS consultations;
- telephone or online medical advice;
- mental-health symptoms and treatment;
- physiotherapy, chiropractic or osteopathic treatment;
- pending referrals or test results.
If you cannot remember a date or detail, tell the insurer rather than guessing. You may be able to check your NHS App, GP record, prescription history or previous correspondence.
Under the Consumer Insurance (Disclosure and Representations) Act 2012, consumers must take reasonable care not to make a misrepresentation when entering or changing an insurance contract. The consequences of an incorrect answer depend on circumstances including what the insurer asked, whether reasonable care was taken and what the insurer would have done with accurate information.
Clear and specific questions matter. Nevertheless, intentionally hiding a condition because you fear an exclusion can result in a claim being declined, different terms being applied or the policy being cancelled.
Keep a copy of:
- the questions you were asked;
- your answers;
- any telephone-call summary;
- the insurer’s underwriting decision;
- the policy certificate and exclusions.
What happens when you switch insurer?
Switching private medical insurance can reduce premiums or improve benefits, but it can also put existing cover at risk.
A condition covered by your current insurer may be treated as pre-existing by a new insurer. Starting a completely new moratorium may also mean that symptoms, advice or treatment from recent years are excluded again.
Some insurers offer continued personal medical exclusions, commonly abbreviated to CPME, or another form of switch underwriting. This may allow personal exclusions from the previous policy to continue rather than underwriting every condition from the beginning.
However, continuity terms vary. Check:
- whether existing covered conditions remain covered;
- whether current exclusions are copied across;
- whether the new insurer adds further exclusions;
- whether ongoing or planned claims are accepted;
- whether treatment already authorised remains covered;
- whether benefit limits or hospital lists change;
- whether a new moratorium applies;
- whether there can be any gap between policies.
Do not cancel the old policy until the new insurer has issued and you have reviewed its final terms. A quotation is not confirmation that all previous cover will continue.
Switching can be particularly risky when you are undergoing investigations, receiving treatment or expect a claim soon.
How do workplace health schemes differ?
Employer-funded health insurance may use full medical underwriting, moratorium underwriting or medical history disregarded terms.
Medical history disregarded, often shortened to MHD, means eligible pre-existing conditions may be covered without individual medical underwriting. It is more commonly available through larger workplace schemes than individual policies.
MHD does not mean that every treatment is covered. The policy can still exclude or limit:
- chronic-condition management;
- routine monitoring;
- emergency treatment;
- pregnancy and childbirth;
- cosmetic treatment;
- experimental treatment;
- care outside the hospital list;
- treatment above benefit limits.
Leaving an employer can be significant. If you move to a personal policy, the insurer may offer continuation terms, but the price and benefits can be very different.
Ask what happens to covered medical conditions if you retire, change jobs or your employer changes insurer. Once a condition becomes pre-existing under a new policy, finding equivalent cover can be difficult or expensive.
Does the underwriting method affect the premium?
It can, but the underwriting route is only one of many pricing factors. Two policies should not be compared using premium alone.
Private health insurance prices can be affected by:
- age;
- postcode;
- individual or family cover;
- hospital list;
- outpatient limits;
- excess;
- claims history at renewal;
- underwriting decision;
- optional cancer, dental or mental-health benefits;
- guided consultant or treatment pathways.
Moratorium underwriting is not necessarily cheaper than full medical underwriting. Some insurers offer both at similar base prices, while the final terms and premium depend on the product and applicant.
A low premium may reflect:
- a restricted hospital network;
- a high excess;
- limited outpatient diagnostics;
- reduced therapies or mental-health cover;
- six-week NHS wait options;
- guided access to consultants.
Our guides to private health insurance excesses and outpatient cover explain two costs and benefit limits that can materially affect a policy’s value.
Which underwriting option is better for you?
Full medical underwriting may be preferable if:
- you want personal exclusions confirmed before buying;
- you have a complicated medical history;
- you can provide accurate health information;
- you want to compare how several insurers would treat a specific condition;
- you prefer clarity even if the underwriting process takes longer.
Moratorium underwriting may be preferable if:
- you want a faster and simpler application;
- your previous conditions were minor and fully resolved;
- you understand that eligibility may be investigated later;
- there is a realistic chance of completing the required symptom-and-treatment-free period;
- you are comfortable with less certainty at the beginning.
Moratorium underwriting may be less attractive if you have conditions requiring ongoing prescriptions, reviews or monitoring. The continuous treatment-free requirement may never be satisfied.
Full medical underwriting may be less attractive if you cannot obtain or accurately remember the information requested. It still may be safer to gather that information than to proceed under a moratorium without understanding how previous symptoms will be treated.
A regulated insurance adviser can obtain indicative underwriting views from different insurers. This may be valuable when your medical history is complex, although you should understand whether the adviser compares the whole market or a limited panel and how they are paid.
What should you check before buying?
Ask the insurer or adviser to answer the following questions in writing:
- Which underwriting method will apply?
- How does the policy define a pre-existing condition?
- Are symptoms included even without a diagnosis?
- How long is the medical-history look-back period?
- What exactly must be avoided during the moratorium period?
- Does routine monitoring restart the qualifying period?
- How are related conditions defined?
- Are any exclusions permanent or reviewable?
- How can I request an exclusion review?
- Will you need my GP records when I claim?
- What happens if I switch insurer later?
- Are chronic conditions covered?
- What outpatient, therapy and mental-health limits apply?
- Do I need authorisation before every consultation or test?
Read the insurance product information document, policy wording, certificate and underwriting letter. Marketing summaries cannot show every exclusion.
If a particular condition is the main reason you want insurance, do not assume it will be covered. Ask directly and obtain confirmation before purchasing.
What can you do if a claim is refused?
Ask the insurer for a written decision explaining:
- the exact policy term being applied;
- which medical evidence it relied upon;
- why the current condition is considered pre-existing or related;
- how the moratorium dates were calculated;
- whether further evidence could change the decision.
Check your application, policy certificate, medical records and chronology of symptoms. A refusal may turn on whether symptoms existed before the policy began rather than when the eventual diagnosis was made.
If you disagree, submit a formal complaint to the insurer. Explain the outcome you want and include relevant evidence from your GP or specialist.
If the insurer does not resolve the complaint or you disagree with its final response, you may be able to refer the matter to the Financial Ombudsman Service. The Ombudsman considers the policy wording, medical questions, records, disclosure and whether the insurer acted fairly.
Its guidance on complaints about pre-existing medical conditions explains the process.
Our guide to what to do when a health insurance claim is refused provides a practical appeal checklist.
Frequently asked questions
What is the main difference between moratorium and full medical underwriting?
Moratorium underwriting usually assesses relevant medical history when you claim. Full medical underwriting collects detailed health information when you apply and normally confirms personal exclusions at the start.
Does moratorium underwriting cover pre-existing conditions?
Not initially. A condition may become eligible after a continuous period—commonly two years—without symptoms, medication, treatment, advice or investigation, subject to the exact policy wording.
Does every moratorium use a five-year look-back?
No. Five years is common, but insurers can use different definitions and periods. Check the specific policy rather than assuming the standard rule applies.
Does the two-year period start from my last treatment?
It commonly starts when the policy begins, although the precise rule varies. If symptoms, advice or treatment occur after joining, the continuous qualifying period may restart.
Does taking regular medication prevent a condition becoming covered?
It often does under a moratorium because the condition has not remained treatment-free. Check whether the policy’s wording counts medication and routine monitoring.
Is full medical underwriting more expensive?
Not necessarily. Prices depend on the insurer, benefits, age, postcode, excess and underwriting decision. The two application methods may have similar starting premiums but different exclusions.
Will full medical underwriting cover my existing condition?
Usually not automatically. The insurer may exclude it, apply restrictions, request more information or occasionally offer modified terms. Obtain the decision in writing.
Can an undiagnosed symptom count as pre-existing?
Yes. Many policies include symptoms experienced before cover began, even if the formal diagnosis was made later.
Do I need to disclose mental-health treatment?
If the application question includes it, yes. Answer the question accurately. Insurers differ in how they assess the information and any resulting exclusion.
Will the insurer contact my GP?
It may. Under full medical underwriting, more information might be requested during the application. Under moratorium underwriting, records are commonly requested when a claim could relate to earlier symptoms or treatment.
Can I change from moratorium to full medical underwriting?
Possibly, but it may involve a new application or underwriting date. Do not assume existing cover or completed qualifying periods will transfer.
What is continued moratorium underwriting?
It is a switching arrangement under which an existing moratorium may continue with the new insurer. Rules vary, and new exclusions or benefit differences may still apply.
What does medical history disregarded mean?
Medical history disregarded underwriting may cover eligible pre-existing conditions without individual medical assessment. It is mainly associated with some employer schemes and still remains subject to general policy exclusions.
Which option is usually better for a complicated medical history?
Full medical underwriting often provides more certainty because exclusions are assessed before the policy starts. Comparing preliminary views from several insurers may be useful.
Which option is best if I have no medical problems?
Either may be suitable. Full medical underwriting gives written clarity, while moratorium cover can be quicker to arrange. You should still compare benefits, exclusions, excesses and premiums.
Can an insurer refuse a claim years after I joined?
Yes, if the claim falls within an exclusion or the condition never satisfied the moratorium requirements. The insurer must apply the terms fairly and should explain the medical evidence supporting its decision.
