Critical Health Insurance: What It Covers and Costs

Written by Tim Bailey
Reviewed by Pratik Aghera
6 min read
Updated: 13 Nov 2026
Health Insurance Guides
Critical Health Insurance: What It Covers and Costs

Critical health insurance in the UK usually means critical illness cover, a policy that pays a one-off tax-free lump sum if you are diagnosed with a serious illness listed and defined in your policy, such as certain cancers, a heart attack or a stroke. The money is yours to use however you choose, whether to clear a mortgage, replace lost income, pay for care or fund adaptations at home.

It is not the same as private medical insurance (which pays for treatment) and it is not income protection (which pays a regular replacement income). Critical illness cover pays once, on diagnosis of a qualifying condition at the specified severity, regardless of whether you have to stop working. It is regulated by the Financial Conduct Authority (FCA).

Prices depend heavily on your age, whether you smoke, your health and how much cover you choose. The sections below explain what is covered, how much it costs, how it compares to income protection, and the main things to weigh before deciding.

Quick Answer: Critical Health Insurance

  • Pays a one-off tax-free lump sum, not a regular income
  • Covered illnesses and their definitions vary significantly between insurers (MoneyHelper)
  • Often sold alongside life insurance as combined life and critical illness cover
  • Smokers and older applicants typically pay substantially more
  • You must survive a set period (often 14 days) after diagnosis to claim

Last updated: October 2026

Written by the Free Price Compare editorial team | Reviewed October 2026

Content in this article

How critical illness cover works

Critical illness cover pays a tax-free lump sum if you are diagnosed with one of the specific serious conditions named in your policy, at the severity the insurer defines. The payout is triggered by diagnosis, not by whether you can still work, and the money is paid directly to you. Most policies also require you to survive a set period after diagnosis, commonly 14 days, before a claim is valid.

The illnesses typically covered include certain cancers, heart attack and stroke, but the exact list and the medical thresholds differ by insurer. According to MoneyHelper, the conditions covered and how they are defined vary significantly between providers, which is why comparing the policy wording matters as much as comparing the price.

Cover is usually bought for a fixed term, for example 20 or 25 years, often to match a mortgage. The policy term is simply the length of time your cover runs, agreed when you take out the plan. Once the term ends, the cover stops and no payout can be made, so matching the term to the period you need protection, such as the years left on your mortgage or until your children are financially independent, is an important early decision. Some policies are standalone, but many are sold as combined life and critical illness cover, where one policy pays out on the first event, whether that is a qualifying illness or death.

What does critical health insurance cover?

Critical health insurance covers the specific list of serious illnesses and medical procedures written into your individual policy, each with its own severity definition. Common inclusions across the UK market are specified cancers, heart attack, stroke, multiple sclerosis, kidney failure and major organ transplant, though no two insurers use identical lists or wording.

Some providers now use severity-based or partial payouts, paying a smaller percentage of the sum assured for less advanced conditions and the full amount for the most serious. Because definitions drive whether a claim is paid, the policy document is the single most important thing to read. If you have an existing condition, it is worth checking how an insurer treats it, as with life insurance with Crohn’s disease or other long-term diagnoses.

Compare life and critical illness options

How much does critical illness cover cost in the UK?

Critical illness cover cost in the UK starts from around £5 per month with several major insurers, but “from” prices apply only to a small share of applicants and are not a universal rate. Halifax advertises critical illness cover from £5 a month; its website says 7% of customers paid £5 a month for single, level critical illness cover bought online between 1 June 2023 and 31 May 2024. Prices can change and depend on personal circumstances. Your own premium depends on your age, health, smoker status and the amount of cover.

To show how age and smoking affect the price, the table below uses dated example quotes for combined life and critical illness cover. These are estimated, not quotes for you, and premiums are confirmed only after underwriting.

Applicant (level cover) Non-smoker Smoker
Age 30 £26.08/mo £58.67/mo
Age 40 £53.90/mo £94.29/mo

Price valid as of 26/10/2026

These are indicative example quotes and may change; your premium will depend on your circumstances and underwriting. They illustrate how much smoking and age push up the price: at age 30 the smoker example is more than double the non-smoker figure.

Decreasing cover, where the payout falls over time to track a repayment mortgage, is usually cheaper than level cover. For a wider view of what shapes a protection quote, see our guide on what makes people look for life insurance.

Why do smokers and older applicants pay more?

Smokers and older applicants pay more for critical illness cover because insurers price on the statistical likelihood of a qualifying diagnosis, which rises with age and with smoking. A non-smoker aged 30 will almost always pay less than a smoker of the same age for the same cover, and the gap widens at older ages.

Health history, family medical history, occupation and some lifestyle factors also feed into underwriting. If you have a pre-existing condition, cover may still be available, sometimes with an exclusion or a higher premium, as explained in our guide to life insurance with pre-existing conditions.

How much does critical illness cover cost in the UK

Weighing up critical illness cover?

See how it can sit alongside your life insurance

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How much cover do I need?

The amount of critical illness cover people choose is usually linked to what the lump sum would need to do, rather than a single fixed rule. Common approaches are to cover an outstanding mortgage, to replace a period of lost income, or to fund care and home adaptations if a serious illness means you cannot work for a time.

A larger sum assured costs more each month, so there is a trade-off between the size of the payout and the premium you can sustain for the full term. Think about what debts you hold, what your household would need if your income stopped, and whether the cover should last the length of your mortgage or longer. The right figure depends on your circumstances, and it is worth working it out before you compare quotes so you are comparing like for like.

Does it pay a lump sum, and is it taxed?

Critical illness cover pays a single tax-free lump sum when a valid claim is approved, provided you survive the policy’s defined survival period after diagnosis. There is no income tax or capital gains tax on the payout itself, and it is paid to you (or to a joint policyholder) to spend as you need.

If the policy is written into trust, the payout can usually be kept outside your estate, which can matter for inheritance tax planning on death benefits, though a critical illness payment made while you are alive is your money to use. A specialist adviser or the FCA-regulated firm arranging your cover can explain how trusts work for your situation.

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Is critical illness insurance better than income protection?

Critical illness insurance and income protection do different jobs, so one is not simply better than the other. Critical illness cover pays a one-off lump sum on diagnosis of a listed condition. Income protection pays a regular monthly income if illness or injury stops you working, usually until you recover, retire or the policy ends, and it covers a far wider range of causes, not just a set list of conditions.

Many people view the two as complementary rather than alternatives. Critical illness cover suits a large, immediate need such as clearing a mortgage; income protection suits replacing ongoing earnings over a longer absence. Some households hold both, some hold one, and budget often decides the mix.

Critical illness cover Income protection
Pays One tax-free lump sum Regular monthly income
Triggered by Diagnosis of a listed condition Inability to work through illness/injury
Causes covered Specific defined list Most illnesses and injuries
Best suited to Clearing debt or a lump cost Replacing ongoing earnings

Should I add critical illness cover to life insurance?

Adding critical illness cover to life insurance is one way to protect against serious illness as well as death under a single policy, and several insurers only sell critical illness cover as part of a combined plan. Some insurers offer critical illness cover only alongside life insurance as a combined policy; check the provider’s current product options before applying.

A combined policy typically pays out on the first event, whether that is a qualifying illness or death, after which the cover ends. Buying separate policies can mean the life cover continues after a critical illness claim, but may cost more overall. Neither is automatically cheaper, so compare both structures. Our guide to extra benefits with life insurance covers the common add-ons, and joint life insurance explains how couples can structure cover.

Is critical illness cover worth it?

Whether critical illness cover is worth it depends on what financial gap a serious illness would leave in your household and whether the premium is affordable for the full term. It can provide a significant lump sum at a point when earnings may stop and costs rise, which is why many people with a mortgage or dependants consider it. For context, 6.5 million people were covered by health insurance in the UK in 2024, up 4% on 2023, according to the ABI (published January 2026), reflecting steady demand for health-related protection.

The main reasons a claim can be declined are that the condition is not on the policy’s list, does not meet the severity definition, or that relevant medical information was not disclosed when applying. Reading the policy wording and answering all health questions fully and accurately are the two things that most affect whether a future claim pays. Because conditions and definitions vary so widely, comparing wording, not just price, is central to deciding if a policy represents value for you.

Compare critical health insurance plans

Free Price Compare works with protection specialist LifeSearch to help you compare cover and wording from a panel of UK insurers, so you can weigh the options against your own needs before deciding.

Is critical illness cover worth it

FAQs about critical health insurance

What is critical health insurance?

Critical health insurance is the common name for critical illness cover, an insurance policy that pays a tax-free lump sum if you are diagnosed with a serious illness defined in your policy. It differs from private medical insurance, which pays for treatment, and from income protection, which pays a regular income. The lump sum is yours to use for any purpose, such as clearing a mortgage or replacing lost earnings.

Am I eligible for critical illness cover?

Eligibility depends on your age, health, smoker status and sometimes your occupation, and most UK insurers set minimum and maximum ages for taking out and ending a policy. You will usually answer medical and lifestyle questions when applying, and the insurer may ask for details from your GP. A pre-existing condition does not always rule you out, but it may lead to a higher premium or a specific exclusion.

Does critical illness cover pay a lump sum, and is it taxed?

Critical illness cover pays a single tax-free lump sum once a valid claim is approved and you have survived the policy's defined survival period after diagnosis. There is no income tax or capital gains tax on the payout. If the policy is written in trust, death benefits can often be kept outside your estate, though a living critical illness payment is simply yours to spend.

What happens if my illness is not on the policy's list?

If your diagnosis is not one of the conditions named in your policy, or does not meet the severity definition the insurer uses, the claim will not be paid. This is the most common reason claims are declined, which is why the list of covered conditions and their definitions matter as much as the price. Reading the policy wording before you buy is the best way to understand what is and is not included.

How long do I have to survive after diagnosis to claim?

Most critical illness policies include a survival period, commonly 14 days, meaning you must be alive for that time after diagnosis of a qualifying condition for the claim to be valid. The exact period varies between insurers, so check it in your policy document. If you die before the survival period ends, a combined life and critical illness policy would usually pay the life cover instead.

Can I add critical illness cover to an existing life insurance policy?

You generally cannot bolt critical illness cover onto a live life insurance policy; most insurers require it to be included when the policy first starts. Some providers only sell critical illness cover as part of a combined life and critical illness plan from the outset. If you want to add it later, you would typically need to apply for a new policy, which is underwritten at your current age and health.

Is critical illness cover worth it at £125 a month?

Whether any premium represents value depends on your sum assured, age, health and how much a serious illness would cost your household financially. A high monthly figure usually reflects older age, smoker status, a large payout or combined cover, so it is worth comparing quotes and cover levels across insurers. Comparing the policy wording matters too, because a cheaper policy covering fewer conditions may not suit your needs.

If I forgo private health insurance, should I get critical illness or accident cover instead?

Critical illness cover and accident or injury cover do different jobs, and neither replaces private medical insurance, which pays for treatment. Critical illness pays a lump sum for serious defined conditions, while accident cover responds to injuries, often with smaller, specific payouts. The right mix depends on what you most want to protect against, so compare what each pays, when, and for which events before deciding.

Does smoking affect my critical illness premium?

Yes, smoking significantly increases critical illness premiums because insurers price on a higher likelihood of a qualifying diagnosis. In dated example quotes, a smoker aged 30 paid more than double the non-smoker figure for the same combined cover. Most insurers class you as a non-smoker only after you have been free of nicotine products for a set period, so your status can change over time.

Can I claim on a critical illness policy more than once?

Standard critical illness cover usually pays out once and the policy then ends, so you cannot make a second full claim on the same plan. Some policies offer severity-based or partial payments, where a smaller amount is paid for a less advanced condition without ending the full cover. Check your policy wording, as the rules on partial and multiple payments differ between insurers.

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Information correct as of 26 October 2026. Prices, tariffs, policy details and providers change frequently, so please check the latest details before making a decision. This article is for general information only and does not constitute financial advice. Free Price Compare is authorised and regulated by the Financial Conduct Authority (FCA).

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