ACC Claim Declined in New Zealand: Your Appeal Rights and Time Limits

ACC declines around 10–15% of claims lodged each year — and disputes over declined claims and cut entitlements are among the most common legal matters New Zealanders face. The system looks simple on the surface: you are injured, you lodge a claim, ACC covers you. But the reality is that ACC makes decisions based on its interpretation of your medical information, and those decisions are not always right. You have the right to challenge every one of them — but time limits are strict, and the wrong step early on can close off options later.

What ACC Covers — and What It Doesn’t

New Zealand’s Accident Compensation Corporation (ACC) provides no-fault cover for personal injuries caused by accidents. Under the Accident Compensation Act 2001 (ACA), a covered injury entitles you to:

• Treatment costs: doctors, specialists, surgery, physiotherapy, and other approved treatment
• Weekly compensation: 80% of your pre-injury earnings if you cannot work
• Rehabilitation: vocational rehabilitation, social rehabilitation, home help
• Lump sum payments: for permanent impairment from the injury
• Survivor and funeral grants: for fatal accidents

ACC’s coverage has a specific scope. It covers personal injury caused by accident. This means:

• Physical injuries from accidents (trips, falls, car crashes, workplace accidents, sports injuries)
• Work-related gradual process injuries (certain conditions caused by sustained exposure at work)
• Medical misadventure (treatment injuries under Part 3 of the Act)
• Mental injury caused by a physical injury or certain criminal acts

What it does not cover: illness (heart disease, cancer, diabetes — these are not accidents), gradual mental health deterioration without a physical accident, and injuries caused by the person’s own deliberate self-harm in most circumstances.

Common Reasons ACC Declines a Claim

Understanding why your claim was declined is the starting point for challenging it. ACC decisions are governed by the ACA and by ACC’s own operational guidelines, which are not always applied consistently.

Stage 1: Requesting a Review

Before you can appeal to any court, you must first go through ACC’s own internal review process. This is mandatory under the Accident Compensation Act 2001 — you cannot skip it and go straight to court.

Time limit: 3 months. You must lodge your review request within 3 months of the date of the ACC decision you are challenging. The 3 months runs from the date on the decision letter, not from when you received it — be careful. If you miss this deadline, you may apply for late review, but late review is granted at ACC’s discretion and is not guaranteed.

The review process works as follows:

1. Lodge a written review request. Write to ACC stating that you dispute the decision and want a review. Identify the specific decision and state briefly why you disagree. You do not need to make your full legal argument at this stage — but get the request in on time.
2. ACC appoints an independent Reviewer. The review is conducted by an independent reviewer — not an ACC staff member. The reviewer is a specialist (often medically or legally qualified) appointed from a panel approved by the Minister.
3. Prepare your submissions and gather evidence. The review is conducted on the papers in most cases — written submissions and documentary evidence. Medical evidence from your treating doctors, specialists, or an independent medical expert is usually the most important material.
4. Attend a hearing if one is convened. In some cases, especially complex ones, the reviewer may hold an oral hearing. You can attend in person. A lawyer or advocate can represent you.
5. Receive the review decision. The reviewer must issue a decision within 90 days of receiving the review application. The reviewer can confirm ACC’s decision, modify it, or overturn it entirely and substitute their own decision.

Stage 2: Appealing to the District Court

If the review decision goes against you, you can appeal to the District Court. This is a full appeal — the court can review the facts as well as the law, and can substitute its own decision for the reviewer’s.

Time limit: 28 days. You must file your notice of appeal within 28 days of the reviewer’s decision. This is a tight window. If you are considering a District Court appeal, engage a lawyer immediately after receiving the review decision — do not wait.

District Court ACC hearings are more formal than the review process. Both sides can call witnesses, including medical experts. Written submissions are standard. The process is more like ordinary litigation and legal representation is strongly recommended.

The District Court can:

• Confirm the reviewer’s decision
• Overturn it and find in your favour
• Remit the matter back to ACC with directions
• Award costs in appropriate cases

Stage 3: High Court and Beyond

Appeals from the District Court to the High Court are available, but only on questions of law — not on the facts. If the District Court correctly applied the law but reached a factual finding you disagree with, a High Court appeal will not succeed. High Court ACC appeals are uncommon and reserved for cases where a genuine legal question is in issue.

From the High Court, further appeals to the Court of Appeal and Supreme Court are theoretically available but very rare — reserved for cases raising questions of significant legal importance.

When ACC Cuts or Suspends Your Entitlements

ACC decisions to decline a new claim are the most dramatic, but decisions to cut or suspend existing entitlements affect many more people. Weekly compensation is cut when ACC decides you have recovered sufficiently to work. Rehabilitation support ends. Treatment payments stop. Each of these decisions is individually reviewable.

Common triggers for entitlement cuts:

• A medical assessor appointed by ACC (not your own doctor) finds you fit for some work
• An Independent Medical Examination (IME) contradicts your treating doctor’s assessment
• ACC decides you have reached “maximum medical improvement”
• A vocational rehabilitation assessment concludes work is available to you

Medical Evidence: The Heart of Every ACC Dispute

Almost every ACC dispute ultimately comes down to medical evidence. ACC’s decision was based on medical information it received — and a successful challenge almost always requires better, more comprehensive, or more clearly reasoned medical evidence on your side.

The most valuable types of evidence in an ACC review or appeal:

• Treating specialist opinion: A letter from your specialist explaining, with reference to clinical evidence, why the injury is covered, ongoing, and the cause of your current limitations
• Independent Medical Examination (obtained by you): A report from a specialist you have chosen and commissioned, giving their own assessment of causation and severity
• GP records: A complete set of your medical records showing the history of your condition and the impact of the accident
• Functional capacity evaluation: An assessment by an occupational therapist of your actual functional limitations in the context of work

ACC disputes are won and lost on medical evidence. A skilled lawyer who handles ACC cases understands how to obtain, frame, and present that evidence effectively in the review and appeal process.

When to Get Legal Help

Not every ACC dispute requires a lawyer. If your claim was declined for a straightforward reason and the fix is obvious — for example, you forgot to include a document — you may be able to resolve it yourself. But for complex disputes, particularly those involving:

• Causation disputes (ACC says the accident did not cause the injury)
• Pre-existing condition arguments
• Treatment injury claims
• Long-term weekly compensation disputes
• Vocational rehabilitation and work capacity assessments
• Lump sum impairment calculations

… a lawyer who specialises in ACC disputes is a sound investment. Many ACC lawyers work on a contingency or conditional basis for reviews and appeals — they take a proportion of any recovery rather than charging upfront. Ask at the initial consultation what the fee arrangements are.

Frequently Asked Questions

The System Is Not Designed to Automatically Give You What You Are Entitled To

This is the uncomfortable truth about ACC that most New Zealanders do not discover until they need to use it for a serious injury. ACC is a large government corporation with its own financial pressures. Its staff make decisions based on information in their files — and that information is not always complete, accurate, or sympathetically interpreted.

The review and appeal system exists precisely because those decisions are sometimes wrong. Reviews overturn ACC decisions regularly — in some years, between 30% and 40% of reviews result in the original decision being changed or overturned. That is a significant proportion. It means that a declined claim or a cut entitlement is not necessarily the end of the road — it may simply be the beginning of the correct process.

The critical factor: acting promptly and with the right medical evidence. Leaving it too long, or assuming the decision must be correct, is the most common reason people lose entitlements they were legally owed.

Sources and Legislation

• Accident Compensation Act 2001 — New Zealand Legislation
• What ACC covers — acc.co.nz (official ACC website)
• Review and appeal — acc.co.nz (official)
• District Court — justice.govt.nz