At a glance
- Symptoms before cover starts can make a condition pre-existing, even with a later diagnosis.
- Moratorium rules allow later cover for some conditions, but time alone is not enough.
- Full medical underwriting assesses medical information at application and records personal exclusions in writing.
New private health insurance policies usually exclude pre-existing conditions. Moratorium underwriting allows some conditions to qualify later if the policy’s rules are met. Full medical underwriting assesses medical information at the start and records personal exclusions in writing.
What counts as a pre-existing condition
A pre-existing condition is a medical problem that existed before your cover began. The policy’s definition can include illness or injury symptoms before that date, even without a diagnosis.
Knee pain before joining is one example. A diagnosis after joining does not automatically make it a new condition. The insurer considers the medical evidence and policy wording.
Exclusions can cover related conditions as well as the named illness. The wording and medical connection decide their scope. Check exactly what an exclusion means.
A pre-existing condition does not necessarily stop you taking out insurance. A policy may cover eligible new, unrelated acute conditions. These are expected to respond to treatment rather than need ongoing management.
How moratorium underwriting works
Moratorium underwriting usually means no detailed medical questionnaire at application and checks on relevant medical history when you claim. The policy’s rules exclude pre-existing conditions.
A common approach looks back at the five years before cover starts and initially excludes conditions from that period. Some may qualify after two continuous years following the start date with no symptoms, treatment, medication or advice for that condition. Exact periods and requirements vary by policy.
The clear period matters
Under a rolling moratorium, the clear period can restart if the condition needs attention. Your policy’s second anniversary does not automatically bring every earlier condition into cover.
For example, a policy might require two continuous years without treatment or advice for an old injury. Further treatment restarts that period if the rules require it. The wording decides how reviews and monitoring count.
Conditions needing regular care may never qualify. General exclusions, including those for chronic conditions, still apply even after you meet moratorium rules.
NHS treatment can also interrupt a clear period. The rules apply even if you make no private claim.
Less paperwork at the start does not mean wider cover.
How full medical underwriting works
Full medical underwriting, or FMU, assesses medical information at application before the insurer confirms its terms. This usually involves a medical questionnaire, with further information from a GP where needed.
The insurer records personal exclusions in your policy documents. These identify excluded conditions or symptoms and, depending on the wording, related problems.
This gives you a clearer picture before cover starts. It does not mean every claim will be accepted. Treatment must fall within your benefits, and the insurer can check for links to an exclusion.
Family members can have different underwriting terms. One person’s exclusion does not mean everyone has the same restriction. The documents should show whose cover each exclusion affects.
Some exclusions may be reviewed
An insurer may review an exclusion later, depending on the condition and its rules. That is not automatic expiry. The exclusion stays unless a change is confirmed in writing.
The word full describes the underwriting process. It does not mean unlimited cover or cover for every pre-existing condition.
Moratorium v full medical underwriting
The difference is when medical information is assessed and how exclusions are recorded. Both approaches usually restrict pre-existing conditions. You still need to read the policy.
- At application. Moratorium underwriting usually needs less medical information at the start. FMU involves an assessment before terms are confirmed.
At claim. A moratorium claim may need medical records to establish whether its rules have been met.
FMU claims can also require medical evidence.
- Written exclusions. FMU normally records personal exclusions at the outset. A moratorium generally relies on the policy’s definition and qualifying rules.
- Later cover. Some moratorium exclusions can fall away when the required conditions are met. An FMU exclusion normally remains unless the insurer agrees to change it.
Less paperwork at the start does not mean wider cover. A list of personal exclusions does not replace the general policy wording.
Underwriting is only one part of cover
A condition can meet underwriting rules but fall outside your policy’s benefits. Cover depends on the treatment and options included.
Private medical insurance pays for eligible treatment of acute conditions. It excludes ongoing management of chronic conditions, routine pregnancy and cosmetic treatment. Our guide to what private health insurance does not cover explains the wider limits.
Check outpatient benefits, hospital lists and the excess alongside underwriting terms. Extra treatment benefits do not override personal medical exclusions.
MoneyHelper’s guide to private health insurance explains common benefits and exclusions. The NHS remains available, including for conditions your policy excludes. Private health insurance excludes A&E and emergency care. It does not replace NHS emergency services.
Switching when you already have cover
A condition that started during your existing policy could count as pre-existing under a completely new policy. Check the underwriting basis before moving between insurers.
Continued personal medical exclusions
Continued personal medical exclusions, or CPME, may let a new insurer carry forward existing personal exclusions. Its acceptance rules decide availability. Check the proposed terms for further exclusions.
Continued moratorium
A continued moratorium may preserve your original moratorium date instead of starting again. The new insurer’s rules still apply. Get written confirmation of the date recognised and how earlier conditions will be treated.
Continuing underwriting does not mean every benefit stays the same. Hospital access and treatment limits may differ. Acceptance alone does not confirm payment for treatment already planned or underway.
Some continuation routes require unbroken cover. A gap can affect eligibility. Line up your old policy’s end date with the new policy’s start date.
Confirm the new insurer’s acceptance, start date and terms before existing cover ends. Our guide to switching private health insurance explains what to compare before moving.
Leaving a company health insurance scheme
Some company schemes use medical history disregarded underwriting. This can cover pre-existing conditions within the scheme’s benefits and general exclusions. It is not standard on a new individual policy.
When your employment ends, there may be an option to continue cover individually on specified terms. The route depends on your scheme and how soon you apply. Continuation does not necessarily preserve every benefit.
Starting again under ordinary new policy terms could exclude conditions covered through work. Our guide to leaving a company health insurance scheme explains why you should check continuation terms before the scheme ends.
What to check before choosing cover
The underwriting label is a starting point. Read the policy wording and personal terms to see the differences.
- Check the definition of a pre-existing condition and whether related conditions are included.
- For a moratorium, check the period before joining that is considered and the clear period required afterwards.
- For FMU, check each personal exclusion and whether the insurer offers any review process.
- When switching or continuing company cover, check which underwriting dates and exclusions will carry forward.
Keep written terms with your policy documents. If the insurer declines a claim because of a pre-existing condition, it should explain the policy clause and evidence behind its decision.
Take a formal complaint to the firm concerned first. The Financial Ombudsman Service explains complaints about pre-existing condition exclusions, including when it may consider a complaint.
A health insurance specialist explains underwriting and cover and gives you quotes. You can compare private health insurance to talk through your options with a specialist.
Common questions
Can I get private health insurance with a pre-existing condition?
A pre-existing condition does not necessarily stop you taking out cover. New individual policies usually exclude it while covering eligible new, unrelated acute conditions.
Does moratorium underwriting cover pre-existing conditions after two years?
Some policies cover certain conditions after two continuous years that meet their clear period rules. Time alone is not enough. Other exclusions still apply.
What is the difference between moratorium and full medical underwriting?
Moratorium underwriting usually checks medical history when you claim and applies the policy’s exclusion rules. Full medical underwriting assesses medical information at application and confirms personal exclusions in writing.
Can I switch private health insurance with an existing condition?
Continued personal medical exclusions or a continued moratorium may allow a switch. Acceptance depends on the new insurer’s rules. Benefits and exclusions also vary.
Last updated 8 November 2026