The Health Guide — clear answers, healthier tomorrows

    Critical illness

    Critical illness cover: what is it and why might you need it?

    Written by Andrew Buscu, PMI Specialist & Copywriter, PremierPMI
    Reviewed by Stuart Hendy, PMI Expert and Head of Publishing, PremierPMI

    Published 30 September 2026 · Last reviewed 30 September 2026 · Next review 30 March 2027 · 14 min read

    The short answer

    Critical illness cover pays a single lump sum if you are diagnosed with a specified illness, such as some cancers, heart attack or stroke, that meets the policy definition. It does not pay for treatment. Instead it helps with the wider financial impact — mortgage, bills and lost income — and can sit alongside private medical insurance.

    PremierPMI is an insurance broker, authorised and regulated by the FCA (FRN 1029667). We may receive commission if you take out a policy. How we are funded.

    In this guide11 sections
    Protection claims paid in 2024
    £8bn[1]
    Protection claims paid in 2025
    £7.84bn[2]
    Statutory Sick Pay, per week
    £123.25[4]
    How it pays
    One lump sum

    What you need to know before looking at critical illness cover

    1. It pays a single lump sum on a qualifying diagnosis — it does not pay for treatment itself. Read more
    2. Private medical insurance and critical illness cover do different jobs and can work side by side. Read more
    3. The real question is how long your savings would last if your income stopped. Read more
    4. The right amount depends on your mortgage, bills, income, savings and existing benefits. Read more
    5. A diagnosis alone is not enough: the illness must meet the policy definition. Read more

    At a glance

    Private medical insurance can provide valuable support with accessing private healthcare and treatment when you need it. But what happens if a serious illness affects more than your health?

    Critical illness cover can provide a lump sum if you are diagnosed with one of the specified illnesses covered by your policy. The money can help you and your family manage the wider financial impact of a serious illness, whether that means helping with household bills, maintaining your lifestyle or protecting your savings.

    Protection policies paid out a record £8 billion in life, critical illness and income protection claims in 2024, according to figures from the industry’s trade body, the Association of British Insurers. [1] The ABI’s figures for the following year put protection pay-outs at £7.84 billion. [2]

    None of us know what’s around the corner. Yet many of us still cross our fingers, and trust that “it won’t happen to me”.

    What is critical illness cover?

    Critical illness cover is designed to provide a lump sum if you are diagnosed with one of a range of specified illnesses or suffer a specified medical event covered by your policy.

    The conditions covered vary between providers and policies, but can include serious illnesses such as cancer, heart attack and stroke. [8]

    The money can generally be used however you choose, subject to the terms of the policy. You could use it to help pay household bills, reduce your mortgage, replace lost income, make changes to your home or simply give you and your family greater financial flexibility while you recover.

    The important thing is that critical illness cover is not designed to pay for treatment itself. It is there to provide financial support following a qualifying diagnosis or event. Our guide to what critical illness cover is and how it works goes further into definitions, survival periods and combined cover.

    Private medical insurance and critical illness cover

    Private medical insurance and critical illness cover can provide different types of protection and can work alongside each other.

    Private medical insurance can provide valuable support with accessing private healthcare and eligible treatment when you need it. Critical illness cover is designed to provide a lump sum if you are diagnosed with a specified illness or suffer a specified medical event covered by your policy.

    While private medical insurance is focused primarily on your healthcare needs, critical illness cover can provide an additional layer of financial protection against the wider financial consequences of a serious illness.

    If you were unable to work for several months, for example, your mortgage, household bills and other financial commitments would still need to be paid. A critical illness payout could help provide financial flexibility during this period.

    The two types of cover are therefore not alternatives. They can complement each other as part of a wider approach to protecting your health, income and financial wellbeing.

    How private medical insurance and critical illness cover differ — scroll sideways to see all columns
    Private medical insuranceCritical illness cover
    What it is forAccess to eligible private diagnosis and treatmentFinancial support after a qualifying diagnosis or event
    How it paysPays hospitals and specialists for approved treatment, subject to limitsOne lump sum paid to you
    What triggers itAn eligible, covered medical need, usually after a GP referralA diagnosis that meets the policy definition
    How the money is usedOn the treatment the insurer has authorisedHowever you choose, subject to the policy terms
    Typical termRenews each yearSet term, often matched to a mortgage or family commitment
    Cash-in valueNoneNone — the plan stops if payments stop

    Why might I need critical illness cover?

    A serious illness can affect much more than your health. It can affect your ability to work, your income, your family and your plans for the future.

    If you are the main household earner, the financial impact can be particularly significant. Even if you have private medical insurance and can access treatment, you may still face a period away from work or additional costs while you recover.

    Critical illness cover can provide a lump sum following a qualifying diagnosis, giving you greater financial flexibility at a time when your priorities may have changed. For example, the money could be used to:

    • Help replace lost income
    • Continue paying the mortgage or rent
    • Cover household bills
    • Protect your savings and investments
    • Pay for additional support
    • Make adaptations to your home
    • Reduce debts
    • Maintain your family’s standard of living

    You decide how to use the money, subject to the terms and conditions of the policy. Some public help exists for specific costs — for example, a Disabled Facilities Grant from your local council can contribute towards some home adaptations — but it is means-tested and capped. [9]

    What could happen if I become seriously ill?

    It is natural to focus on the medical side of a serious illness. You may think about seeing a specialist, having tests, receiving treatment and recovering. But there can also be a financial side.

    If you are unable to work for several months, your income could fall while many of your regular expenses continue.

    Your mortgage or rent still needs to be paid. Household bills still arrive. Children may still need to be supported. And you may want to spend more money than usual on practical help, travel or changes to your home.

    Private medical insurance can help with access to eligible healthcare and treatment. Critical illness cover can provide a lump sum to help with some of the wider financial consequences. This is why the two forms of protection can work well together.

    Serious illness is not rare. Cancer Research UK estimates that around half of people in the UK born after 1960 will be diagnosed with some form of cancer during their lifetime. [5]

    Protecting your income protects your family

    Your ability to earn an income is often one of your most valuable financial assets. For many people, future earnings will be worth considerably more than the savings and investments they currently hold.

    A serious illness could interrupt that income. If you are self-employed, the impact can be even greater. Responsibility for your income and financial security rests largely with you rather than an employer.

    For employees, the statutory safety net is modest: Statutory Sick Pay is £123.25 a week, paid by your employer for up to 28 weeks. [4] Self-employed people do not receive it at all. Our guide to critical illness cover for the self-employed looks at that gap in more detail.

    Critical illness cover can provide a lump sum following a qualifying diagnosis, giving you greater flexibility at a time when you may need it most. The money could help you take time away from work without immediately having to draw heavily on your savings.

    What each safety net pays — and what it does not — scroll sideways to see all columns
    Safety netWhat it paysWhat to bear in mind
    Statutory Sick Pay£123.25 a week, for up to 28 weeks (employees only)Not available to the self-employed; eligibility rules apply
    Employer sick paySet by your contractVaries widely — check your own terms
    SavingsWhatever you have built upCan be used up quickly if income stops and costs continue
    Private medical insuranceEligible private treatment costsDoes not replace income or pay household bills
    Critical illness coverOne lump sum on a qualifying diagnosisOnly pays if the policy definition is met
    Income protectionA regular monthly income while you cannot workUsually starts after a deferred period

    Would your savings be enough?

    Savings are an important part of financial planning. An emergency fund can help you deal with unexpected expenses or a temporary reduction in income. But a serious illness can last much longer than a typical emergency fund is designed to cover.

    It can take years to build meaningful savings, but those savings can be depleted surprisingly quickly when income falls and expenditure remains broadly unchanged.

    The question is therefore not simply: “Do I have savings?” It is: “How long would my savings last if my income stopped?”

    And perhaps more importantly: “Would I want to use my savings to fund my living costs if I became seriously ill?”

    Critical illness cover can help reduce the pressure on those savings if you are able to make a successful claim.

    How much critical illness cover might I need?

    There is no single amount of critical illness cover that is right for everyone. The appropriate level will depend on your circumstances, financial commitments and how much financial risk you are comfortable taking yourself. You might consider:

    • Your mortgage or other debts
    • Your household expenditure
    • Your income
    • Your savings and investments
    • Your employer’s benefits
    • How long you could afford to be away from work
    • Whether you are self-employed
    • The needs of your partner or children
    • Any existing protection policies you already have

    For some people, the priority may be paying off their mortgage. For others, it may be providing enough capital to replace lost income for a period of time.

    The important thing is to consider what would happen financially if you became seriously ill, rather than simply choosing an arbitrary level of cover. Our guide on how much critical illness cover you need walks through the arithmetic step by step.

    What should I look for in critical illness cover?

    Not all critical illness policies are the same. The illnesses covered, definitions, exclusions and conditions for making a claim can vary between providers. It is therefore important to look beyond the headline amount of cover. You should consider:

    What illnesses are covered?

    Policies can cover different illnesses and medical events, so it is important to understand the specific conditions included. What critical illness cover pays out for sets out the core conditions and how partial payments work.

    What are the policy definitions?

    A diagnosis does not necessarily mean a claim will automatically be paid. The illness or event must meet the definition set out in the policy. The Financial Ombudsman Service looks closely at policy definitions when it considers declined critical illness claims. [6]

    How much cover do I need?

    Consider your income, expenditure, debts, savings and the financial needs of your family.

    How long should the cover last?

    The appropriate term will depend on your circumstances and the financial commitments you are looking to protect.

    What exclusions and limitations apply?

    Understanding what is not covered can be just as important as understanding what is covered. Answer the application questions carefully: the Consumer Insurance (Disclosure and Representations) Act 2012 requires you to take reasonable care not to misrepresent your medical history. [7]

    Your critical illness checklist

    1. Would your family be financially secure if you were diagnosed with a serious illness?
    2. How long could you afford to be away from work?
    3. Would you be able to continue paying your mortgage or rent?
    4. Would you need to use your savings to cover your household bills?
    5. How long would your savings last if your income stopped?
    6. Would your private medical insurance cover your healthcare needs, while your wider finances remained protected?
    7. Would you want to make changes to your home or lifestyle while recovering?
    8. How much financial support would give you and your family greater peace of mind?

    Why critical illness cover matters

    None of us know whether we will ever need to make a critical illness claim. That is the nature of insurance.

    The value of critical illness cover is knowing that, should you suffer a qualifying illness, you could have a financial safety net to help you and your family deal with the consequences.

    Private medical insurance can help you access healthcare when you need it. Critical illness cover can provide financial support if you suffer a specified illness or medical event. They provide different types of protection, but can work together as part of a wider approach to protecting your health, income and financial wellbeing.

    Over the last three years the ABI’s figures show protection insurers paying between £7.34 billion and £8 billion a year across life, critical illness and income protection claims. [3] [1] [2]

    Looking at cover with PremierPMI

    PremierPMI is a specialist private medical insurance broker and the publisher of The Health Guide. If you want to talk through what this means for your own cover, you can start there.

    Or, if you would rather start here, send an enquiry and PremierPMI will contact you.

    PremierPMI is an insurance broker, authorised and regulated by the FCA (FRN 1029667). We may receive commission if you take out a policy. How we are funded.

    Common questions

    Is critical illness cover the same as private medical insurance?
    No. They do different jobs. Private medical insurance pays for eligible private diagnosis and treatment — the consultant, the scans, the hospital stay — subject to the limits and exclusions in your policy. Critical illness cover does not pay for treatment at all. Instead, it pays you a single lump sum if you are diagnosed with one of the specified illnesses, or suffer a specified medical event, and the diagnosis meets the policy definition. You can then use that money however you choose, subject to the policy terms: for the mortgage, household bills, lost income or changes to your home. Because one looks after your healthcare and the other looks after your finances, many people see them as complementary rather than as alternatives.
    Does critical illness cover pay for my treatment?
    Not directly. The lump sum is paid to you, not to a hospital, and the policy does not approve or arrange treatment. You could choose to spend some of the money on private care if you wanted to, but the cover is designed to deal with the financial consequences of a serious illness rather than the medical side. If access to private treatment is your main concern, that is the job private medical insurance is built for. Critical illness cover sits alongside it, helping with the bills, debts and lost earnings that continue while you recover. Checking what each policy actually pays for — and who it pays — is the simplest way to avoid assuming one does the work of the other.
    Which illnesses does critical illness cover usually include?
    It varies between providers and policies. Most policies cover the most commonly claimed conditions — such as specified cancers, heart attack and stroke — and many include a much longer list of other illnesses and medical events, sometimes with smaller partial payments for less severe conditions. [8] What matters is not the name of the illness but the written definition in your policy, which may set out the severity or stage that must be reached. Two policies can both list the same condition and still define it differently. Before comparing prices, compare the list of conditions and read the definitions for the ones that matter most to you.
    How much critical illness cover should I have?
    There is no single right figure. A sensible starting point is to add up what a serious illness would cost you financially: any mortgage or debts you would want to clear or keep paying, your household spending, the income you might lose and for how long, and any one-off costs such as changes to your home. Then take away what you already have — savings you would be comfortable using, sick pay from your employer, Statutory Sick Pay of £123.25 a week for up to 28 weeks if you are employed [4], and any existing protection policies. What remains is the gap that cover might fill. Some people aim to clear the mortgage; others want enough to replace income for a set period.
    What happens if a claim is declined?
    First, ask the insurer to explain its decision in writing, including which part of the policy definition it believes was not met or which answer on the application it is relying on. If you disagree, you can make a formal complaint to the insurer. If you are still unhappy after its final response, or after eight weeks, you can take the complaint to the Financial Ombudsman Service, which is free to use. The Ombudsman considers whether the insurer applied the policy definitions fairly and, where non-disclosure is alleged, whether the insurer followed the Consumer Insurance (Disclosure and Representations) Act 2012. [6] [7] Keeping copies of your application and policy documents makes this much easier.
    Does critical illness cover have a cash-in value?
    No. Critical illness plans are protection policies, not savings or investments. They do not build up a cash-in value, and if you stop paying the premiums the cover stops too — you do not get back what you have paid in. That is the nature of insurance: you pay for the protection while it is in place. It is therefore worth choosing a level of cover and a term you can realistically keep paying for, and reviewing it when your circumstances change, such as moving home, taking on a larger mortgage or having children. The levels and bases of taxation, and reliefs from taxation, can also change and depend on individual circumstances.
    I am self-employed. Does that change things?
    It can make critical illness cover more relevant, because there is usually no employer sick pay to fall back on and Statutory Sick Pay is paid only to employees. [4] If you could not work for several months, the responsibility for keeping up with the mortgage, bills and business costs would rest largely with you. A lump sum could give you the flexibility to step back from work without immediately drawing on savings or business reserves. Income protection, which pays a regular monthly income while you cannot work, is another option to consider alongside it. Our guide to critical illness cover for the self-employed covers the detail.

    Sources and methodology

    1. [1] Association of British Insurers (reported by Cover Magazine). “Record £8bn paid out in vital protection claims during 2024”. Published 14 July 2025. View source(opens in a new tab)
    2. [2] Association of British Insurers. “Protection insurers pay out £7.84 billion to help customers safeguard their finances”. Published 29 June 2026. View source(opens in a new tab)Primary source
    3. [3] Association of British Insurers and GRiD (reported by Cover Magazine). “£7.34bn paid out by protection insurers in 2023”. Published Accessed 15 September 2026. View source(opens in a new tab)
    4. [4] GOV.UK. “Statutory Sick Pay”. Published Accessed 15 September 2026. View source(opens in a new tab)Primary source
    5. [5] Cancer Research UK. “Lifetime risk of cancer — all cancers combined”. Published Accessed 15 September 2026. View source(opens in a new tab)
    6. [6] Financial Ombudsman Service. “Critical illness cover — how we handle complaints”. Published Accessed 15 September 2026. View source(opens in a new tab)Primary source
    7. [7] UK Parliament (legislation.gov.uk). “Consumer Insurance (Disclosure and Representations) Act 2012”. Published Enacted 8 March 2012. View source(opens in a new tab)Primary source
    8. [8] Which? Money. “What is critical illness cover?”. Published Accessed 15 September 2026. View source(opens in a new tab)
    9. [9] GOV.UK. “Disabled Facilities Grants: what you’ll get”. Published Accessed 21 September 2026. View source(opens in a new tab)Primary source
    10. [10] Financial Conduct Authority. “The Financial Services Register”. Published Continuously updated; accessed 15 September 2026. View source(opens in a new tab)Primary source

    We cite primary sources wherever possible. Read about our sourcing methodology.

    Written by

    Andrew Buscu

    PMI Specialist & Copywriter, PremierPMI

    • Whole-of-market private medical insurance adviser
    • Claims and renewal specialist

    Andrew is a member of the private medical insurance advisory team. He gathers detailed client requirements and liaises with insurers to arrange tailored quotes across the whole UK market, guiding clients from first quote through to claims and renewal. In one case he reduced a client renewal premium from £36,000 to £11,520 without reducing cover.

    Read full profile

    Reviewed 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.

    Read full profile

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