Critical illness cover pays out for kidney disease when it meets the policy's definition, and the standard wording covers kidney failure that needs permanent dialysis rather than kidney disease in general; some policies, Vitality's among them, also pay part of the cover at earlier stages.

If kidney disease is part of your own history, an FCA-authorised broker could explain how insurers word these definitions and what they ask when you apply; request that call on the form on this page.

Why is dialysis, not the diagnosis, the test?

The Association of British Insurers (ABI) gives this model definition, numbered 4.2.9, in its minimum-standards guide (April 2023 update):

Kidney failure – requiring permanent dialysis Chronic and end stage failure of both kidneys to function, as a result of which regular dialysis is permanently required.

The ABI defines dialysis as "the artificial means of removing toxic substances (impurities and wastes) from the blood when the kidneys are unable to do so". Read together, the definition has three parts, and each one is a condition of a claim: the failure is chronic and at end stage, it affects both kidneys, and regular dialysis is needed for good. It names a treatment, not a stage on a clinic letter, so a result such as the eGFR figures in the kidney patients guide does not on its own tell you whether the wording is met.

The NHS puts this in context: chronic kidney disease "only progresses to kidney failure in around 2 in 100 people with the condition" (page last reviewed 22 March 2023).

Can a policy pay anything before kidney failure?

Some policies grade conditions. Vitality's provisions pay a percentage of the Serious Illness Cover amount set by a scale from A to G, where A pays 100%, B 75%, C 50% and D 25%. Its kidney entries sit across that scale:

  • Level A: Kidney Failure, in the ABI words above.
  • Level B: Severe Chronic Renal Impairment, where the estimated glomerular filtration rate is below 15 and stays there "persistently for a period of six months or more".
  • Level C: Chronic Renal Impairment, defined in the same way with a rate below 25.
  • Level D: Acute Renal Dialysis, meaning "more than two treatments of haemodialysis over a three week period" or more than 24 hours of haemofiltration after a rapid decline in kidney function.

This is one insurer's design, not a rule for the market, and it shows why short-term dialysis and permanent dialysis can be treated very differently. How grading works in general is on the page about severity-based critical illness cover.

Does a kidney transplant, or waiting for one, count?

A transplant is a separate condition. The ABI's model for major organ transplant covers the person "undergoing as a recipient of a transplant from another person, of bone marrow or of a complete heart, kidney, liver, lung, or pancreas, or inclusion on an official UK waiting list for such a procedure".

Legal & General explains its version in plain words: "You will be covered as soon as you are put on the official UK waiting list because it may take a long time to find a donor." It adds that the definition "doesn’t cover donating an organ". Aviva and Royal London also list major organ transplant, and Aviva shows it in the same group as kidney failure.

That makes the list of conditions the thing to read, not the word "kidney": a policy might name kidney failure, a transplant, both or neither.

Which policies list kidney failure?

Not every policy has to. The ABI guide says that "the three core conditions covered by all critical illness insurance policies are cancer, heart attack and stroke". Kidney failure is set out in a later chapter of conditions that insurers may offer, and the guide says that, apart from the core three, insurers "are not required to include any of the conditions covered in Chapter 4 or the exclusions set out in Chapter 5".

These insurers print the same definition in their own documents:

InsurerDocumentWhere the definition sits
Legal & GeneralGuide to Critical Illnesses Covered (QGI14860 01/26)The kidney failure entry, with a note: "This definition covers kidney failure that requires dialysis."
AvivaLife Insurance+ Policy Conditions (AL50002 02/2026)Listed under critical illness benefit (full payment)
Royal LondonPersonal Menu Plan Critical Illness Cover plan details (July 2025), arranged through advisersThe kidney failure entry in the list of definitions
VitalityPersonal Protection Plan Provisions (VLTD174857WF_J3779_02/2025), an adviser-channel documentEntered as "Kidney Failure" in the urogenital tract and kidney category

The ABI guide says an insurer that includes one of its conditions must adopt the model definition, and that where it improves on that minimum the difference must be made clear, so check the definition in the policy terms you are sent.

Start with the policy's own list of conditions. Our guide to the conditions critical illness cover names shows how the lists compare, and the ABI minimum standards are explained on their own page.

What if you already have kidney disease when you apply?

Insurers decide on what you tell them. Legal & General's page on pre-existing conditions (dated 16 March 2026) says that some pre-existing conditions "would mean we would be unable to offer Critical Illness, where others may mean we charge an extra premium or exclude the specific condition from the cover". It adds that every applicant is assessed individually.

An exclusion matters at the point of a claim. Vitality's provisions say it must have agreed to cover you for the condition you claim for, that the plan schedule shows any exclusions, and that it will not pay if the illness is a consequence of an excluded condition. They also list as a reason not to pay that it is not satisfied the illness occurred during cover or was disclosed at application. How a kidney exclusion would be worded is for the insurer to show you in the quote documents.

The rules on honesty are in the Consumer Insurance (Disclosure and Representations) Act 2012: section 2 puts a duty on the consumer "to take reasonable care not to make a misrepresentation to the insurer", and section 5 treats a misrepresentation as careless if it is not deliberate or reckless. The consequences are laid out in the disclosure rules for life insurance.

Which of your results or treatments one insurer would weigh most is a question for the broker, who can answer it at no cost once they ring you. Wider background is in critical illness cover with pre-existing conditions, and life insurance with medical conditions covers the life-cover side. After a refusal, the options are laid out in the guide to a declined life insurance application, and a broker can approach specialist insurers, though no offer can be promised.

Ready to take it further? Asking for that call means giving a first name, an age range and a phone number; the form on this page does the rest, there is no fee for it, and your kidney history can wait until you are speaking.

Frequently asked questions

Does critical illness cover chronic kidney disease?

The ABI model for kidney failure asks for chronic and end stage failure of both kidneys with permanent regular dialysis, so a chronic kidney disease diagnosis on its own is not what that wording describes. Some insurers add their own conditions, such as Vitality's Chronic Renal Impairment. Check the definitions in the policy you are looking at.

Does critical illness cover kidney failure?

A policy need not name it. Where it does, the ABI wording makes permanent, regular dialysis part of the test.

What if dialysis is only needed for a short time?

The ABI wording asks for dialysis that is "permanently required". Vitality has a separate, lower-paying condition for short-term dialysis after a rapid decline in kidney function; other policies may not.

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