Critical illness cover, explained
The short answer
Critical illness cover pays a one-off, tax-free lump sum if you are diagnosed with a condition listed in your policy and meet its definition. Every policy sold as critical illness cover by an ABI member must cover cancer, heart attack and stroke to the ABI's minimum wording. What else is covered, and how severe it must be, varies.
Critical illness cover pays you a single lump sum if you are diagnosed with one of the conditions listed in your policy and your diagnosis meets the policy's definition of that condition. MoneyHelper describes the payment as tax-free, and you can spend it on whatever you need: treatment, the mortgage or rent, or changes to your home such as wheelchair access.
The catch is in the word "definition". A policy does not pay because you are seriously ill. It pays because a specialist confirms you meet a precise medical wording. So the most useful thing you can do with an existing policy is read those definitions, and the rest of this guide explains what they usually say.
How critical illness cover works
You pay a monthly premium for a set term. If you meet the definition of a listed condition during that term, the insurer pays the sum assured. MoneyHelper notes that a standalone policy only pays out once, after which it ends. Cover is often sold alongside life insurance. If yours is combined, check whether a critical illness claim also uses up the life cover.
Some policies include extra payments. The ABI's Guide sets out two terms insurers must use:
- Additional payment: a payment that does not reduce the main sum assured.
- Partial payment: a part payment that does reduce what is left.
MoneyHelper suggests checking whether a policy pays 25% or 50% of the lump sum for less serious illnesses, and whether it pays anything if one of your children is diagnosed with a covered condition.
Survival periods and assessment periods
Two timing rules can matter at claim time. A survival period is the time after diagnosis you must survive before the benefit is paid. The ABI says this may apply where the death benefit differs from the critical illness benefit, or on standalone cover. An assessment period applies to conditions that must be permanent to qualify. The ABI says it typically starts when the claim is received and normally lasts no more than 12 months, as long as all the evidence is available.
The ABI Guide to Minimum Standards
Most UK critical illness policies are written to the Association of British Insurers' Guide to Minimum Standards for Critical Illness Cover. It began as a Statement of Best Practice in 1999, after the Office of Fair Trading found that the variety of definitions made policies hard to compare. It was renamed in 2018. The current version is dated 16 September 2022 and was updated in April 2023, and insurers had to adopt it by 16 September 2023.
The Guide does three things:
- Sets the three core conditions. To be sold as "critical illness" cover by an ABI member, a policy must cover cancer, heart attack and stroke, defined at least as generously as the ABI's model wordings. The ABI says these three accounted for over 80% of critical illness claims (2016 figures).
- Sets minimum wordings for other conditions. Insurers do not have to cover anything else. But if they cover a condition the Guide has a model wording for, such as multiple sclerosis, kidney failure, major organ transplant, Parkinson's disease or dementia including Alzheimer's disease, they must use that wording or something more generous, and make clear where they go further.
- Standardises common exclusions. If a policy excludes, say, hazardous sports or living abroad, it must use the ABI's wording.
Compliance is a condition of ABI membership. A small number of insurers are not members, but the Guide notes that regulators and the Financial Ombudsman Service are likely to treat it as good industry practice. The Ombudsman says it looks at whether an insurer followed the guide that applied when the policy was taken out.
What the core definitions actually say
These are summaries of the ABI's minimum wordings. Your policy may be more generous.
Cancer, excluding less advanced cases. A malignant tumour confirmed by histology, with uncontrolled growth and invasion of tissue. Not covered at the minimum standard: cancers classed as pre-malignant, in situ, borderline or of low malignant potential; prostate tumours below a Gleason score of 7 (unless they have reached a set stage); early urinary tract and thyroid tumours below set stages; malignant melanoma confined to the outer layer of skin; and other skin cancers.
Heart attack, of specified severity. A definite diagnosis of acute myocardial infarction with death of heart muscle, shown by typical symptoms, new ECG or imaging changes, and a rise in cardiac enzymes or troponin above set levels. Angina, and heart muscle injury without infarction, are not covered.
Stroke, resulting in permanent symptoms. Death of brain tissue from inadequate blood supply or bleeding in the skull, causing permanent neurological deficit. Transient ischaemic attacks (mini-strokes), traumatic brain injury and eye strokes are not covered.
Total permanent disability
Many policies also pay if you become permanently disabled. The ABI allows four definitions, and the one in your policy makes a large difference:
| Definition | You must be unable, permanently, to... |
|---|---|
| Own occupation | do the material and substantial duties of your own type of work |
| Suited occupation | do any work that suits your experience, training and skills |
| Specified work tasks | do at least 3 of 6 tasks such as walking 200 metres or climbing 12 stairs |
| Looking after yourself | do at least 3 of 6 daily tasks such as washing, dressing or feeding yourself |
In every option, specialists must expect the disability to last for life. Disabilities without a clear prognosis are not covered.
What is usually excluded
MoneyHelper lists common exclusions as non-invasive cancers, high blood pressure and injuries such as broken bones. The ABI's model exclusions, which apply only if your insurer chooses to use them, include alcohol or drug abuse, criminal acts, flying other than as a passenger on a commercial flight, listed hazardous sports, living outside the UK or EU for more than 13 weeks in any 12 months, intentional self-injury, unreasonable failure to follow medical advice, and war.
Children's cover has its own model exclusion: no payment if the condition was present at birth, if symptoms began before the child was covered, or if the child dies within 28 days of meeting the definition.
If you were considered at risk of a condition when you applied, MoneyHelper notes the insurer may have excluded it or charged more. Those personal exclusions sit in your policy schedule, not the general terms.
What changes the cost
MoneyHelper lists the main factors: your age, whether you smoke or have smoked, your health, weight and family history, your job, and how much cover you want. The type of premium also matters. Reviewable premiums are typically reviewed every five years and can rise. Fixed premiums stay the same for the life of the policy. Some policies let you pay extra for waiver of premium, which covers your premiums if you cannot work; MoneyHelper notes it usually starts only after at least six months off sick.
How claims work and why they fail
The ABI reports that insurers paid £1.25 billion in individual critical illness claims in 2025. Cancer made up 65% of them and the average payout was £67,000. Across all individual protection policies, 97.9% of claims were paid that year.
When claims are refused, the Financial Ombudsman Service says the cases it sees most often involve the insurer alleging the customer did not disclose something on the application. Other disputes are about whether the diagnosis meets the definition, how the policy was described when sold, and delays.
A few points from the Ombudsman's approach are worth knowing:
- It normally prefers evidence from a specialist consultant over a GP's.
- For permanent disability claims, you need medical evidence that there is no reasonable cure, and that you have tried substantial treatment.
- An insurer cannot make you undergo serious or invasive surgery to prove your claim.
If an insurer says you misrepresented something, the Consumer Insurance (Disclosure and Representations) Act 2012 limits what it can do, depending on whether the mistake was careless or deliberate. Our guide to declined claims covers this and the complaint route in detail.
What to check in your policy
- The list of conditions, and the full definition for each, not just the headline name.
- Whether the policy states it meets the ABI Guide to Minimum Standards, and which version applied when you bought it.
- Cancer wording: which early-stage cancers, if any, get a partial payment.
- Partial and additional payments: how much, for which conditions, and whether they reduce your main cover.
- Total permanent disability: which of the four definitions applies, and any age limit.
- Survival period: how many days, and what happens if you die within it.
- Children's cover: ages covered and the amount.
- Exclusions: the general list, and any personal exclusions added at underwriting.
- Premium type: fixed or reviewable, and when reviews happen.
- Whether a claim ends the policy, and whether it also uses up any life cover.
- Your application answers: request a copy and check they were accurate.
When to talk to a regulated adviser
MoneyHelper calls critical illness insurance a potentially complicated product and suggests getting advice from an independent financial adviser or specialist broker. That can make sense if you are comparing definitions across policies, have a health condition that may lead to exclusions, or are thinking of replacing an existing policy. Replacing cover means new underwriting at your current age and health, so it is worth getting the new policy in place before cancelling the old one. InsuredRight does not recommend products, but our free policy check can help you find the clauses above in your own documents.
Not sure what yours says? Upload your critical illness cover documents and we'll show you the cover, the exclusions and the conditions, with the wording behind each.
Check my policyCommon questions
What illnesses does critical illness cover pay out for?
Every policy sold as critical illness cover by an ABI member must include cancer, heart attack and stroke, defined at least as well as the ABI's model wordings. Beyond those three, insurers choose. MoneyHelper notes the most comprehensive policies cover 50 or more conditions, while others are much more limited. Your policy wording lists each condition and the severity needed to claim.
Is a critical illness payout taxed?
MoneyHelper describes the payout from a personal critical illness policy as a tax-free, one-off lump sum. You can use it however you like, for example on treatment, your mortgage or rent, or adapting your home. Business-owned policies, such as key person cover, can be taxed differently, so check with an accountant if your employer or company owns the policy.
Does critical illness cover pay out for every cancer?
No. The ABI's minimum cancer definition excludes cancers classed as pre-malignant, in situ, borderline or of low malignant potential, melanoma confined to the outer layer of skin, other skin cancers, and early prostate, thyroid and urinary tract tumours below set stages. Some policies add a smaller partial payment for some of these earlier cancers.
What is the difference between critical illness cover and income protection?
Critical illness cover pays one lump sum when you meet the definition of a listed condition, whether or not you can still work. Income protection pays a regular monthly amount, usually 50% to 65% of your income, if illness or injury stops you working, after a waiting period. Income protection can be claimed more than once; a standalone critical illness policy usually ends after a full claim.
Can I cancel critical illness cover if I change my mind?
MoneyHelper says you have 30 days from buying the policy to change your mind and get a full refund. After that you can cancel at any time, usually without a fee, but you will not get back premiums already paid and you cannot reinstate the policy. Replacement cover is likely to cost more as you get older, and new health conditions may be excluded.
What happens if I forgot to mention something on my application?
Under the Consumer Insurance (Disclosure and Representations) Act 2012 you must take reasonable care not to misrepresent anything. If a mistake was careless rather than deliberate, the insurer's remedy depends on what it would have done had it known. It might add an exclusion, scale down the payout in proportion to the premium, or cancel and refund premiums. Telling the insurer early is usually easier than it surfacing at claim time.
Sources
- MoneyHelper: What is critical illness cover? checked 2 Oct 2026
- ABI Guide to Minimum Standards for Critical Illness Cover (16 September 2022, updated April 2023) checked 2 Oct 2026
- ABI: Updates to the ABI's Guide to Minimum Standards for Critical Illness cover checked 2 Oct 2026
- ABI: Protection insurers pay out £7.84 billion to help customers safeguard their finances (2025 figures, published June 2026) checked 2 Oct 2026
- Financial Ombudsman Service: Critical illness cover checked 2 Oct 2026
- HMRC Business Income Manual BIM45525: insurance for key persons checked 2 Oct 2026
- Consumer Insurance (Disclosure and Representations) Act 2012 checked 2 Oct 2026
This guide is general information about how insurance works in the UK. It isn't advice and doesn't take your circumstances into account. Policies differ: your own policy documents are what count.