Key Takeaway

Critical illness cover pays a tax-free lump sum if you are diagnosed with a serious condition named in your policy, such as cancer, heart attack, or stroke. Policies typically cover 40 to 50 core conditions, but definitions and exclusions vary widely between insurers. Before you buy, check the specific wording for each condition, compare survival periods, and confirm whether the policy is written in trust so the payout bypasses your estate.

What Is Critical Illness Cover?

Critical illness cover is a type of protection insurance that pays out a one-off lump sum if you are diagnosed with a specified serious illness or injury during the policy term. You can buy it as a standalone policy or bundled with life insurance (known as life insurance with critical illness cover). The payout is designed to help cover lost income, medical costs, home adaptations, or debt repayment while you recover.

The policy lists the conditions it covers and sets out strict medical criteria for each one. If your diagnosis matches the definition in the policy wording and you survive the required period (often 14 or 28 days), the insurer pays the lump sum and the policy ends. As covered in Principles of Finance, protection insurance products like critical illness cover form part of a household’s risk management strategy alongside life and income protection cover.

What Conditions Are Typically Covered?

Most UK critical illness policies cover a core set of conditions, typically including:

  • Cancer (excluding less advanced cases)
  • Heart attack (of specified severity)
  • Stroke (resulting in permanent symptoms)
  • Coronary artery bypass surgery
  • Kidney failure requiring dialysis
  • Multiple sclerosis
  • Major organ transplant
  • Loss of limbs or sight
  • Paralysis
  • Motor neurone disease
  • Parkinson’s disease
  • Alzheimer’s disease or dementia (diagnosed before age 60 to 65)

Many policies now cover 40 to 50 conditions, with some covering partial payouts (typically 25 per cent of the sum assured) for less severe diagnoses such as early-stage cancer, angioplasty, or cardiomyopathy. The exact list and the medical definitions vary by insurer, so two policies covering the same condition may have different claim criteria.

According to the Association of British Insurers, cancer, heart attack, and stroke account for the majority of critical illness claims paid in the UK (ABI, 2026). The Financial Conduct Authority regulates critical illness policies as insurance contracts, and claims must be assessed against the policy wording as it stood when you took out the cover (FCA, 2026).

What to Look For When Choosing a Policy

When comparing critical illness policies, focus on these practical features:

Read the definitions carefully. The policy document sets out the exact medical criteria for each condition. A heart attack, for example, may require specific test results or permanent damage to heart muscle. Check whether the definitions are broad or restrictive, and confirm which early-stage conditions qualify for a partial payout.

Read also: Terminal Illness Benefit in UK Life Cover: What’s Already Included

Check the survival period. Most policies require you to survive for a minimum period (often 14, 28, or 30 days) after diagnosis before the claim is paid. A shorter survival period can make a difference for aggressive illnesses.

Compare the number of conditions. More conditions can offer broader protection, but the core conditions (cancer, heart attack, stroke) matter most. Some insurers pad the list with rare illnesses that account for very few claims.

Consider partial payouts. Policies with partial (or additional) payments for less severe diagnoses let you claim more than once if you are diagnosed with different conditions over time, though each payout reduces the remaining cover.

Check exclusions and limitations. Pre-existing conditions, lifestyle exclusions (smoking, high-risk activities), and age limits for certain conditions (such as Alzheimer’s diagnosed after age 65) can affect your cover. Read the exclusions section in full.

Writing the policy in trust. If you write your critical illness policy in trust, the payout goes directly to your named beneficiaries and does not form part of your estate, avoiding potential inheritance tax and speeding up access to the money. MoneyHelper provides guidance on writing policies in trust (MoneyHelper, 2026).

Next Steps

If you are considering critical illness cover, request a policy summary and the full policy wording from the insurer before you buy, and compare definitions across at least two or three providers. Use an FCA-authorised insurance adviser or broker to help you match the cover to your personal circumstances, including your occupation, health history, and family medical background. Verify current premiums, terms, and claim criteria directly with the insurer, as policy features and pricing change regularly.

Disclaimer: This article provides general information only and is not regulated financial or insurance advice. We are not authorised by the Financial Conduct Authority. Critical illness cover terms, conditions, exclusions, and premiums vary by insurer and by policy, and your eligibility depends on your personal health and circumstances. Always read the policy wording and key facts document in full, and consider speaking to an FCA-authorised insurance adviser for guidance on your specific situation before making a decision.