Critical illness cover is one of those products that a lot of people have a rough idea about but very few people actually understand — until they need to make a claim.
And that’s exactly the wrong time to find out the details.
Here’s a plain-English guide to what critical illness cover is, what it pays out for, and — just as importantly — what it doesn’t.
The basic idea
Critical illness cover pays you a tax-free lump sum if you’re diagnosed with a serious medical condition that’s on the policy’s covered list. You receive the money on diagnosis — not when you die, not after a waiting period, not subject to how sick you are. Diagnosed and covered means paid.
You can spend the money however you want. Pay off the mortgage, cover private treatment, adapt your home, take time off work, pay for childcare. There are no strings attached.
"The small print on critical illness policies matters more than most people realise. Here's what to look for."
What's typically covered
Most standard critical illness policies cover three core conditions: cancer, heart attack, and stroke. Together, these account for the majority of claims.
Beyond the core three, comprehensive policies cover a wide range of additional conditions — including heart valve replacement, aorta surgery, multiple sclerosis, motor neurone disease, Parkinson’s disease, kidney failure, organ transplant, and total permanent disability.
Some policies also include partial payments for less severe conditions — an early-stage cancer, for example, or a less severe heart attack. These partial payments are typically 25% of the sum insured.
What's often not covered — and why this matters
This is where critical illness cover gets complicated, and where people sometimes find themselves disappointed at claim time.
Not all cancers are covered. Some policies exclude early-stage skin cancers, for example, or cancers that haven’t reached a certain stage. The exact definition matters enormously.
Heart attacks have definitions too. A policy might require a specific level of enzyme markers to be present, or evidence of permanent heart muscle damage. A mild cardiac event might not meet the definition on a cheaper policy.
The difference between policies on these definitions can be enormous. Two policies at similar premium levels might have very different coverage in practice. This is why comparison sites are genuinely inadequate for critical illness cover — the price comparison doesn’t tell you anything about the quality of the definitions.
The ABI definition problem
Many policies follow Association of British Insurers minimum definitions. But minimum doesn’t mean comprehensive. Some insurers go well beyond ABI minimums and offer broader, more generous definitions — particularly for cancer.
Finding the policy with the best definitions for your circumstances is exactly what a good independent adviser does. For some clients, particularly those with a family history of specific conditions, getting the right cancer definition could be the difference between claiming and not claiming.
Critical illness vs life insurance — what's the difference?
Life insurance pays out when you die. Critical illness cover pays out when you’re diagnosed with a serious condition. They’re covering different risks.
Many people are surprised to learn that a serious illness is often more financially devastating than death in the short term. You’re still alive — bills still need paying, the mortgage is still running — but you may be unable to work for months or years. Critical illness cover fills that gap.
Combining life insurance with critical illness cover gives comprehensive protection — the life policy covers your family if you die, the critical illness policy covers the financial impact of surviving a serious diagnosis.
How much do you need?
A common starting point is enough to pay off your mortgage and cover a year of lost income. For most families that’s somewhere between £150,000 and £500,000, depending on your mortgage and earnings.
The right amount depends on your personal circumstances — and getting that calculation right is worth spending time on, because you’re unlikely to change it once the policy is in place.
