Key Takeaways
Pre-existing conditions are one of the biggest factors in what health insurance in New Zealand will and will not pay for. If you had symptoms, advice or treatment for a condition before your cover starts, a new policy will usually exclude that condition, at least for a period. This guide explains how pre-existing conditions and health insurance work in NZ, what you must disclose, and how to apply with a health history.
- A pre-existing condition usually means anything you had signs, symptoms, advice or treatment for before your cover started, whether or not a doctor diagnosed the condition.
- New health policies commonly exclude pre-existing conditions, either permanently or until a stand-down period has passed.
- Under current New Zealand law you must tell the insurer everything material to the risk, not only what the application form asks.
- The Contracts of Insurance Act 2024 will change the disclosure duty for consumers, but the main provisions are not due to commence until 15 November 2027.
- Conditions that first appear while you are insured are generally covered under that policy, so switching or cancelling needs care.
- Applying while you are healthy and keeping your cover continuous gives you the most options later.
What counts as a pre-existing condition
Each insurer defines pre-existing conditions in the policy wording, and the definitions are not identical. Most treat a condition as pre-existing if, before your cover began, you had symptoms of the condition, saw a doctor or other health professional about the condition, had tests or investigations, or received treatment or medication.
The key point is that the definition usually looks at what happened before the start date, not only at formal diagnoses. A condition can be pre-existing even if you only noticed symptoms and never got as far as a specialist.
Undiagnosed symptoms count too
Many people assume that if nothing was ever confirmed, there is nothing to tell. That is not how most policy wordings work. If you had recurring headaches, a lump that was checked, or chest pain that settled on its own, an insurer may treat any later condition linked to those symptoms as pre-existing.
Examples people overlook
- An old sports injury that still flares up, such as a knee or shoulder.
- A test or scan that came back clear but was ordered because of symptoms.
- Recurring back pain, reflux, migraines or skin issues managed by your GP.
- A specialist referral you never followed up.
- Mental health consultations or prescribed medication.
- Conditions under monitoring, such as blood pressure or cholesterol.
If you are unsure whether something is relevant, include the detail on your application and let the insurer assess the information. Leaving something out is far riskier than including the detail.
How health insurers treat pre-existing conditions
When you apply for an individual policy, the insurer reviews your health history and decides on what terms to offer cover. This process is called underwriting. The outcome depends on the insurer, the type of policy and the details of your history, so two insurers can reach different decisions about the same person.
| Possible outcome | What the outcome means for you |
|---|---|
| Standard terms | No specific exclusions based on your history. Normal policy terms and waiting periods still apply. |
| Specific exclusion | A named condition, and often anything related to that condition, is not covered. Everything else is covered as normal. |
| Exclusion with a review option | Some insurers may consider removing an exclusion on request after a period without symptoms, advice or treatment. |
| Stand-down for pre-existing conditions | Some policies exclude all pre-existing conditions for a set period and may then cover them if the conditions stay symptom-free and untreated during that time. |
| Declined | The insurer does not offer cover. This is less common, but can happen with some histories. |
Full underwriting compared with stand-down terms
Some policies assess your full history upfront and list any exclusions in your acceptance letter. Others apply a general rule that excludes pre-existing conditions for a set period instead of asking detailed questions. Full underwriting gives you certainty about what is excluded from day one. Stand-down terms can be simpler to apply for, but you may only find out at claim time whether a condition is treated as pre-existing.
What "covered after a stand-down" usually means
Where a policy offers cover for pre-existing conditions after a stand-down period, there are usually conditions attached. A common requirement is that you have had no symptoms, advice or treatment for that condition during the period. If the condition flares up during the stand-down, the clock may restart. The policy wording sets out exactly how this works, so read the definitions section closely.
Your duty of disclosure under current NZ law
Disclosure is where most problems with pre-existing conditions start. Getting this right protects your future claims.
What the law requires today
At the moment, disclosure is governed by the long-standing common law duty of utmost good faith. In practice, this means you must tell the insurer any information that would influence the decision of a prudent insurer about whether to offer cover and on what terms. That duty is wider than the questions on the form. If something material is not asked about, you are still expected to disclose the information.
The duty applies when you apply, and generally again whenever you ask to change or reinstate your cover. Answer every question fully and accurately, and include anything else you think an insurer would want to know.
What happens if something is left out
Non-disclosure is usually discovered when you make a claim and the insurer reviews your medical records. Depending on what was missed, the insurer may decline the claim, add an exclusion, or treat the policy as if the policy never existed. Under the current rules, a mistake on your application can still affect a claim, even when the mistake was innocent. If you realise you missed something after applying, tell the insurer or your adviser straight away.
The Contracts of Insurance Act 2024: what changes and when
The Contracts of Insurance Act 2024 became law in November 2024. According to MBIE, the main changes are due to take effect on 15 November 2027, and supporting regulations are still being developed. Until then, the current rules described above continue to apply.
Once the new rules commence, people buying consumer insurance will no longer have a positive duty to volunteer material facts. Instead, the duty will be to take reasonable care not to make a misrepresentation, which mainly means answering the insurer's questions honestly and carefully. Remedies for an innocent or careless mistake will also become more proportionate. The new duty is expected to apply to policies entered into or varied after commencement, so existing policies stay under the current rules unless they change.
Timing: why applying early matters
Because pre-existing conditions are commonly excluded, the time to take out health insurance is while you are well. Waiting until you notice symptoms usually means that condition, and anything related to the condition, will not be covered by a new policy.
Conditions that arise while you are covered
If a condition first appears after your cover starts, and you disclosed everything when you applied, that condition is generally covered under your policy, subject to the policy terms and limits. This is one of the most valuable features of holding cover over the long term. Over time, your existing policy can end up covering conditions that a new insurer would exclude.
Keep your cover continuous
A gap in cover can undo years of protection. If you cancel and reapply later, everything that has come up in the meantime is likely to be treated as pre-existing. If premiums are becoming hard to manage, look at ways to reduce the cost before cancelling, such as raising your excess or removing extras.
Switching, cancelling and changing jobs
Pre-existing conditions are the main reason to slow down before changing anything about your health cover.
Switching insurers
A new insurer will usually underwrite you again from scratch. Any condition that developed under your current policy may become a pre-existing condition on the new one. Before moving, compare exactly what you would keep and what you would lose. Our guide to switching health insurance providers in NZ covers the checks in detail.
Leaving a group scheme
If you are covered through work, your cover usually ends when you leave. Some group schemes include a continuation option that lets you move to a personal policy without answering new health questions, as long as you apply within a set time after leaving. If you have developed a health condition while in the scheme, this option can be valuable. Check the terms before your last day. Our page on workplace group health schemes explains how these arrangements work.
Upgrading your cover
Adding benefits or lowering your excess on an existing policy may involve new health questions. Conditions that arose since you first took out the policy could be excluded from the upgraded part of your cover, even though your original level of cover continues.
Practical tips for applying with a health history
- Ask your GP for a summary of your medical notes so you can answer accurately.
- List every condition, symptom, test and medication from the period the application asks about.
- Include anything you are unsure about and let the insurer decide whether the detail matters.
- Read your acceptance letter carefully and check any exclusions are worded as narrowly as possible.
- Ask whether any exclusion can be reviewed in future, and what evidence the insurer would need.
- Keep a copy of your application and all correspondence with your policy documents.
How SHARE - The Advisory can help
An adviser can explain how different insurers are likely to view your history, help you complete the application accurately, and compare policies on more than price. If you already hold cover, we can review whether changing your policy makes sense or whether you are better to stay put. Find out more about our health insurance advice, read our guide on how to choose health insurance cover in NZ, or get in touch with an adviser.
Conclusion
Pre-existing conditions shape what health insurance can do for you. Apply while you are healthy, disclose everything material, and be careful about switching, cancelling or letting group cover lapse when you change jobs.
The disclosure rules are set to change in November 2027, but for now the current duty applies. If you are unsure how your history will be treated, get advice before you apply. This article is general information only and is not personalised advice.
Frequently Asked Questions
Can I get health insurance in NZ with a pre-existing condition?
Often yes, but the condition and related issues are likely to be excluded. The insurer assesses your history when you apply and sets out any exclusions in your acceptance terms.
Will a pre-existing condition ever be covered?
Some policies may cover certain pre-existing conditions after a stand-down period, usually only if you have had no symptoms, advice or treatment for that condition during that time. Some insurers may also review a specific exclusion on request.
Do I have to disclose something the application form does not ask about?
Under current New Zealand law, yes. You must disclose any information a prudent insurer would consider relevant. The Contracts of Insurance Act 2024 will narrow this duty for consumers once the main provisions commence, due on 15 November 2027.
What happens if I forget to disclose something?
Non-disclosure can lead to a claim being declined or the policy being cancelled from the start. If you realise you missed something, contact your insurer or adviser as soon as possible.
Should I switch health insurers to save money?
Check carefully first. A new policy may exclude conditions your current policy covers, so a lower premium can come at the cost of cover you are most likely to need.