Critical illness cover pays a tax-free lump sum if you are diagnosed with one of the serious conditions listed in your policy — typically cancer, heart attack, or stroke. The average payout is around £70,000–£80,000. Most people use it to pay off or reduce a mortgage, cover adaptation costs, or replace lost savings while recovering.
In 2026, UK insurers paid out £1.5 billion in critical illness claims, with a claims acceptance rate of around 92% across the industry. The 8% of rejected claims were almost all due to conditions not meeting the policy definition or non-disclosure of pre-existing conditions.
The Core Conditions — What Every Policy Must Cover
The Association of British Insurers (ABI) defines seven core conditions that all standard critical illness policies must cover:
| Core condition | ABI requirement |
|---|---|
| Cancer | Excluding less advanced cases |
| Heart attack | Of specified severity |
| Stroke | Resulting in permanent symptoms |
| Coronary artery by-pass grafts | With surgery to divide the sternum |
| Kidney failure | Requiring permanent dialysis or transplant |
| Major organ transplant | Heart, lung, liver, kidney, or pancreas |
| Multiple sclerosis | With persisting symptoms |
These seven conditions account for over 85% of all critical illness claims paid in the UK. Beyond these, policies differ significantly in the additional conditions covered and the definitions used.
Provider Comparison — Critical Illness Cover
| Provider | Core conditions | Additional conditions covered | Claims payout rate | Premiums | Notable strength |
|---|---|---|---|---|---|
| AIG Life | 7 ABI core | 100+ | ~93% | Mid-range | Most conditions covered |
| Aviva | 7 ABI core | 50+ | ~95% | Mid-range | High claims acceptance; strong brand |
| Legal & General | 7 ABI core | 60+ | ~94% | Competitive | Consistent value; large provider |
| Zurich | 7 ABI core | 65+ | ~93% | Mid-range | Good rehabilitation support |
| Royal London | 7 ABI core | 80+ | ~95% | Slightly higher | Mutual insurer; generous definitions |
| Vitality | 7 ABI core | 75+ | ~92% | Lower start (reviewable) | Health rewards reduce premiums |
| LV= | 7 ABI core | 70+ | ~94% | Mid-range | Clear terms; good customer service |
Claims payout rates are approximate industry figures and change year to year. Check each provider’s own published data.
The Condition Definition Problem — Why More Conditions Is Not Always Better
A policy covering 100 conditions is not automatically better than one covering 60. What matters is how each condition is defined.
Example — heart attack:
- A strict definition may require specific ECG changes, elevated enzymes, AND permanent damage
- A generous definition may require any two of those indicators
- A person with a less severe “warning” heart attack may be covered under one policy but not the other
Example — cancer:
- Many policies exclude ductal carcinoma in situ (DCIS) — early-stage breast cancer caught before it becomes invasive
- Some premium policies include DCIS as a partial payout
- Royal London and AIG Life are generally considered to have more generous cancer definitions
Always read the actual policy definitions, not just the number of conditions listed.
Worked Example — What Does the Payout Cover?
James, 42, has £180,000 remaining on his mortgage, two children, and is diagnosed with a heart attack requiring surgery.
He holds a £200,000 critical illness policy at £42/month (taken out age 35, 30-year term).
- Payout on valid claim: £200,000 tax-free lump sum
- What James uses it for: £180,000 to clear the mortgage; £20,000 to cover 6 months while recovering
- Ongoing cost of the policy: £0 — the policy paid out; it ends
Without the policy, James would have needed to fund the mortgage and living costs from sick pay (likely limited to 6 months) and potentially State benefits.
Indicative Monthly Premiums — 2026
Profile: 35-year-old, non-smoker, £150,000 cover, 25-year term, guaranteed premiums
| Provider | Approximate monthly premium |
|---|---|
| AIG Life | £26–£34 |
| Legal & General | £24–£32 |
| Aviva | £27–£36 |
| Royal London | £29–£38 |
| LV= | £27–£35 |
| Vitality | £19–£28 (reviewable) |
Get personalised quotes — premiums vary significantly based on health, occupation, and smoking status.
Critical Illness Cover vs Income Protection — Which Do You Need?
| Critical illness cover | Income protection | |
|---|---|---|
| What triggers the claim | Diagnosis of a listed condition | Any illness/injury preventing work |
| What it pays | One-off lump sum | Monthly income (50–70% of salary) |
| Duration of payout | One payment | Until you recover, retire, or policy ends |
| Best use of payout | Mortgage, debt, major expense | Ongoing bills, rent, mortgage payments |
| Cost | Lower for same cover amount | Higher for equivalent income replacement |
Both serve different purposes. Ideally, have both. If you can only have one:
- Critical illness if you have a mortgage you need to protect
- Income protection if you have ongoing bills and no savings buffer
See our income protection guide and best income protection providers UK 2026 for the income protection comparison. For full guidance on whether critical illness cover is right for you, see is critical illness cover worth it?