What is critical illness cover, and how does it work in the UK?

Regulator

Financial Conduct Authority[1]

Average CI claim, 2024

£67,600[14]

Most common CI claim cause

Cancer[6]

Complaints route

Financial Ombudsman[4]

What the contract actually does

Critical illness cover is a contract between you and an insurer. In exchange for the premiumPremiumWhat you pay the insurer, monthly or annually, to keep the policy in force., the insurer agrees to pay a tax-free lump sum — the sum assuredSum assuredThe fixed amount a life insurance policy agrees to pay out on a valid claim. — if you are diagnosed with a condition that meets the written policy definitionPolicy definition (critical illness)The exact medical wording a diagnosis must meet before a critical illness claim is paid. while the cover is in force. The money is yours to use however the situation demands: clearing a mortgage, replacing lost income, funding home adaptations or private costs the NHS does not carry. Standard cover has no savings element: if the policy ends without a claim, nothing is returned. Before you buy, the FCA’s conduct rules require the insurer to give you pre-contract information — the Insurance Product Information DocumentInsurance product information documentA short standardised summary of what a policy covers and excludes. and the full wording — and a statutory cancellation period afterwards. [2]Financial Conduct AuthorityAccessed 15 September 2026

Two structural points shape everything else. First, the definition governs: a diagnosis that falls short of the written definition is declined even where the illness is genuine, which is why the wording matters more than the headline condition list. Second, most policies include a short survival periodSurvival periodThe short period after diagnosis you must survive before a critical illness claim is paid. after diagnosis before a claim is payable, keeping the product distinct from life insurance. The FCA’s Consumer Duty requires insurers to design, price and explain products to deliver good outcomes for retail customers. [3]Financial Conduct AuthorityAccessed 15 September 2026 This guide stays on how critical illness cover works.

What the cover pays for

Cancer, heart attack and stroke form the core of every critical illness policy — the Financial Ombudsman Service confirms these three are the regulatory minimum, and that the Association of British Insurers’ guide to minimum standards sets the list of illnesses policies should cover, with definitions generally standardised across the industry. [11]Financial Ombudsman ServiceAccessed 15 September 2026 Cancer dominates claims: it accounted for 62 per cent of critical illness claims in 2024, when critical illness pay-outs reached £1.3 billion at an average of £67,600 per claim. [14]Association of British Insurers and GRiD, reported by Cover MagazineAccessed 15 September 2026 The cover question matters because the underlying risk is common: Cancer Research UK estimates that one in two people born in the UK in 1961 will be diagnosed with cancer during their lifetime. [7]Cancer Research UKAccessed 15 September 2026 Beyond the core conditions, insurers add further defined conditions, and many policies pay partial paymentsPartial payment (additional-condition payment)A smaller pay-out for a less severe condition that does not end the main cover. for less severe diagnoses without ending the main cover. Most adult policies also include automatic cover for childrenChildren’s critical illness coverAutomatic cover for the policyholder’s children, usually included on adult policies at a capped amount. at a capped amount — Legal & General’s published terms, for example, include it automatically at the lower of 50 per cent of the cover amount or £25,000. [12]Legal & GeneralAccessed 15 September 2026 This guide discusses conditions only as they relate to cover and claims — for anything about symptoms, diagnosis or treatment, see the NHS.

From application to claim

The life of a policy has three stages. At application you answer questions on health, lifestyle and family history, and the insurer prices the risk — sometimes requesting a GP report for larger sums or complex histories. During the term you pay the premium; on guaranteed premiums the price is fixed, on reviewable premiums it can be re-rated at set intervals. At claim, you notify the insurer of the diagnosis, supply medical evidence — the insurer usually obtains confirmation directly from your consultant — and the insurer tests the diagnosis against the written definition. Most policies also require you to survive a short period after diagnosis before the pay-out is made. Each stage is documented, and that written record — not the marketing summary — is what governs if a dispute arises later.

Keep the full wording with your important documents and make sure someone in your household knows the policy exists — claims are made by ill people or their families, not by paperwork. Whatever the specifics of how critical illness cover works, the discipline that protects you is always the same: get the insurer’s position in writing, keep the documents with the policy, and make sure the people who would help you claim know the policy exists and where the paperwork lives.

Critical illness, sick pay and the safety net

Critical illness cover sits inside a wider financial safety net, and it helps to see what the other layers provide. Employed people who are too ill to work can qualify for Statutory Sick Pay — £123.25 a week at the time of writing, payable by the employer for up to 28 weeks to eligible employees. [8]GOV.UKAccessed 15 September 2026 That figure is the context for the gap a lump sum is designed to fill: outgoings rarely pause while income does. Income protection replaces a monthly income for any illness or injury rather than a defined list; critical illness cover pays a single lump sum for defined conditions only; and life insurance pays others after death. The products are complementary, not interchangeable — our critical illness versus income protection guide works through the comparison, and life insurance versus critical illness cover covers the other half of the picture.

Related guides

• Your disclosure rights: critical illness cover and pre-existing conditions
• What moves the price of critical illness cover
• If a claim goes wrong: do critical illness policies pay out?

Written by

Stuart Hendy

PMI Expert and Head of Publishing, PremierPMI

• 20 years in UK private medical insurance
• Underwriting and corporate placement specialist

Stuart brings over 20 years of experience advising on UK private medical insurance. He is a key member of the private medical insurance team and Head of the Publishing Team, gathering detailed client requirements, liaising with insurers on tailored quotes, and running training on insurer product changes and underwriting nuance.

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Reviewed by

Emma Leadbetter

Editor and Copywriter, PremierPMI

• 15 years health, finance and consumer journalism
• PhD candidate, University of Chichester

Emma has written across health, finance and consumer-affairs journalism for more than 15 years, and has been part of the PremierPMI team since 2022. She is known for making complex topics easy to understand, and fact-checks every guide against current insurer wording before it goes live. She is completing a PhD at the University of Chichester researching how the NHS has changed since COVID-19.

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