Critical illness cover for cancer pays out when you are diagnosed with a cancer that meets your policy's definition, and that definition does not take in every diagnosis called cancer. The standard definition needs an invasive malignant tumour confirmed under a microscope, so early-stage and low-risk cancers fall outside the main payout, although some policies pay a smaller sum for them.
If cancer is something you or someone close to you is dealing with now, Macmillan Cancer Support's helpline is on 0808 808 00 00 (Monday to Sunday, 8am to 8pm).
The amount is set by the policy, not by the type of cancer: a full claim pays the cover you chose, and early-stage payments are a capped share of it.
Should you want a broker to go through the cancer wording of policies you are weighing up, asking for a call-back through this page is free and commits you to nothing.
What counts as cancer on a critical illness policy?
Cancer is one of three core conditions (with heart attack and stroke) that the ABI says every critical illness policy must cover, to at least its standard model wording. Complying with the ABI's guide (September 2022, updated April 2023) is a condition of membership for ABI members that sell the cover, and the minimum standards explain what that means for any policy you are offered.
The model definition, headed "Cancer – excluding less advanced cases", opens: "Any malignant tumour positively diagnosed with histological confirmation and characterised by the uncontrolled growth of malignant cells and invasion of tissue." Three parts of that sentence do the work:
- Malignant and invasive. The tumour has to invade tissue, not just consist of abnormal cells.
- Histological confirmation. The guide's glossary defines this as a diagnosis based on examining sections of tissue under a microscope, and says it does not include a diagnosis based on tumour cells or molecules found in blood, saliva or other body fluid without further clinically verifiable evidence.
- What it includes. Leukaemia, sarcoma and lymphoma are named, except where they arise from or are confined to the skin.
An insurer that covers cancer must use this model wording and cannot amend it to be less generous, though it may widen it. Legal & General's terms (October 2026) and Aviva's Critical Illness Plan conditions (May 2023) use the same heading and the same opening sentence, and Legal & General's list of what "malignant tumour" includes is longer than the ABI's, adding for example Merkel cell cancer. Your own policy wording is what a claim is judged against. For the product itself, see what critical illness cover is and how it works, part of the critical illness and income guides.
Which cancers does critical illness cover leave out?
The ABI wording says that for cancer "the following are not covered", and the first exclusion covers all cancers histologically classified as pre-malignant, cancer in situ, having borderline malignancy or having low malignant potential. The glossary describes pre-malignant cells as cells that "may develop into a malignant tumour but have not yet done so", and borderline malignancy as "Potentially malignant cells that have not invaded the adjacent tissue." That is why a carcinoma in situ, including early-stage breast cancer such as DCIS, usually does not meet the main definition.
The model wording then sets thresholds for particular tumours, below which they are not covered:
- Prostate: excluded unless graded Gleason score 7 or above, or progressed to at least cT2bN0M0 or pT2N0M0 after removal of the prostate. See prostate cancer.
- Urothelial tumours (the guide describes these as tumours of the urinary tract): excluded unless progressed to at least T1N0M0.
- Thyroid: excluded unless progressed to at least T2N0M0. Legal & General's October 2026 terms carry the same line.
- Skin: melanomas confined to the epidermis (the outer layer of skin) are excluded, and so are other skin cancers that arise from or are confined to the skin's tissue layers. See skin cancer.
- Neuroendocrine tumours and GISTs: without lymph node involvement or distant spread, a neuroendocrine tumour is excluded unless WHO Grade 2 or above, and a gastrointestinal stromal tumour unless assessed as having a moderate or high risk of progression or as UICC/TNM8 stage II or above.
There is no general stage number in the model wording. Which side of those lines a particular biopsy report falls on is a question the broker can go through with you on the free call-back.
Do any policies pay something for early-stage cancer?
Some do, through a smaller payment that leaves the main cover in place. Amounts and conditions differ by insurer:
| Insurer and document | Conditions listed under cancer | What it pays |
|---|---|---|
| Legal & General, policy summary and terms (October 2026) | Carcinoma in situ of the breast treated by surgery; low grade prostate cancer requiring treatment | 25% of the amount of cover, up to £25,000 |
| Aviva, Critical Illness Plan conditions (May 2023) | Carcinoma in situ of the breast; low grade prostate cancer; other named conditions | The lower of £25,000 or 25% of the cover amount for those two, and the lower of £20,000 or 20% for the others |
| Aviva, Life Insurance+ summary (February 2026) | Less advanced cancer of the breast and of the prostate | The lower of £25,000 or 25% of the cover amount for level and decreasing cover |
| Scottish Widows, Protect summary for customers not buying through an aggregator (January 2026) | Carcinoma in situ; carcinoma in situ of the urinary bladder; low-risk GIST; low-grade NET; low grade prostate cancer; ovarian tumour of borderline malignancy; pituitary tumour | 25% of the cover, up to £30,000 |
Legal & General says an additional payment leaves your premiums and amount of cover unchanged, and the main policy still pays on a valid terminal illness, critical illness or death claim. Aviva and Scottish Widows likewise say the policy continues. Each pays once per named condition, though Scottish Widows says it will consider more than one carcinoma in situ claim where it affects a different organ or tissue. Legal & General will not make an additional payment where there is more than one diagnosis in the same period of investigation and treatment and you are eligible to make a full critical illness claim.
These are the insurers' own limits and their own lists, not a market rule. A broker can line up which early-stage cancers each shortlisted policy pays for, if you ask for a call-back here; there is no charge.
How much does critical illness insurance pay out for cancer?
A full claim pays a sum fixed when the policy is set up. Legal & General's policy summary (October 2026) says that if you are diagnosed with a covered illness and survive 14 days from diagnosis, it pays the amount of cover in full once, after which the policy ends. Aviva's Critical Illness Plan summary (May 2023) also says the policy will only pay the full cover amount once, and its conditions and Scottish Widows' summary both require you to survive 10 days. With only the early-stage payments set as percentages, there is no payout calculator for cancer as such. How to choose the sum is in how much critical illness cover you need, and what it costs covers the price.
The ABI reported in June 2026 that "Almost two-thirds (65%) of critical illness claims were for cancer, up 3% compared to 2024." That shows how central cancer is to the cover, not whether a diagnosis qualifies; life and critical illness cover explains buying it alongside life insurance.
Can you buy critical illness cover after a cancer diagnosis?
That is a separate question from what a policy already in force pays for, and the answer depends on where someone is: in treatment, after treatment has ended, or living with a cancer that cannot be cured. An insurer decides each on the medical evidence. What insurers have written about applying once treatment has ended is on life insurance after cancer, and critical illness cover after cancer takes the question for this cover. Terminal illness cover is a different benefit from critical illness, set out in the difference between the two.
Whatever your history, the application questions have to be answered with care: the Consumer Insurance (Disclosure and Representations) Act 2012 says "It is the duty of the consumer to take reasonable care not to make a misrepresentation to the insurer." Disclosure requirements shows how that works for life policies, and pre-existing conditions covers a past diagnosis. When you feel ready, a broker can talk with you about what may be available, including approaching specialist insurers, once you submit the enquiry form; nothing is promised and there is no hurry. If an insurer has already said no, cover with a medical condition explains the routes.
Frequently asked questions
Does critical illness cover pay out for stage 1 cancer?
It depends on the cancer, not the stage number. The ABI model wording excludes in situ and pre-malignant cancers and sets thresholds for named tumours such as prostate, thyroid and neuroendocrine tumours, so a stage 1 diagnosis may or may not meet it. Your own policy's full definition decides.
What types of cancer does critical illness insurance cover?
The model wording covers malignant tumours, including leukaemia, sarcoma and lymphoma, and lists the categories it leaves out. Other conditions that insurers add are on conditions covered.
Does critical illness cover thyroid cancer?
The ABI wording excludes all thyroid tumours unless they have progressed to at least TNM classification T2N0M0, and Legal & General's terms (October 2026) say the same. A thyroid cancer below that level would not meet the main definition.
Does critical illness cover kidney cancer?
None of the ABI's named thresholds is for the kidney as such, so a kidney cancer is measured against the main definition: a malignant tumour, invading tissue, confirmed by examining tissue. The separate threshold for urothelial tumours, which the guide describes as tumours of the urinary tract, can also come into it.
If you would like the cancer wording of the policies you are considering read against your own situation, a broker will take you through it, free and unhurried, when they phone back after your request through the form.
Sources
- Association of British Insurers, ABI Guide to Minimum Standards for Critical Illness Cover (16 September 2022, updated April 2023), read 21 October 2026. abi.org.uk
- Association of British Insurers, Protection insurers pay out £7.84 billion to help customers safeguard their finances (29 June 2026), read 21 October 2026. abi.org.uk
- Legal & General, Life Insurance Policy Terms and Conditions (QGI14872 2026/10, direct version), read 21 October 2026. legalandgeneral.com
- Legal & General, Life Insurance and Critical Illness Cover Policy Summary (QGI14786 2026/10, direct and standalone version), read 21 October 2026. legalandgeneral.com
- Aviva, Critical Illness Plan Policy Conditions (DA09002 05/2023), read 21 October 2026. aviva.io
- Aviva, Critical Illness Plan Policy Summary (DA09001 05/2023), read 21 October 2026. aviva.io
- Aviva, Policy Summary of Life Insurance+ (AL50001 02/2026), read 21 October 2026. aviva.io
- Scottish Widows, Scottish Widows Protect Personal Protection Policy Summary (61041 01/26), read 21 October 2026. scottishwidows.co.uk
- Macmillan Cancer Support, helpline details (undated web page), read 21 October 2026. macmillan.org.uk
- legislation.gov.uk, Consumer Insurance (Disclosure and Representations) Act 2012, section 2, read 21 October 2026. legislation.gov.uk