Can an insurer accept a claim and dispute liability later?

Acceptance of an injury does not fix every future entitlement. Weekly payments depend on incapacity, the statutory payment period, current earnings and work capacity. Treatment must still satisfy the applicable statutory test. Permanent impairment is assessed later when the condition is sufficiently stable. A new diagnosis or consequential condition may require a separate liability decision even though the original injury remains accepted.

For example, an insurer might continue to accept a lumbar injury but dispute a later shoulder diagnosis, reduce weekly payments after a work capacity decision, or refuse proposed surgery as not reasonably necessary. Those are not identical to denying that the original workplace injury occurred. The notice should be read issue by issue.

Section 78 of the Workplace Injury Management and Workers Compensation Act 1998 requires notice where the insurer disputes liability for a claim or any aspect of a claim. Current SIRA material says the approved decision notice must identify the decision, its date, when it takes effect, the reasons and the information used. Additional rules apply to some decisions, including primary psychological injuries caused by relevant conduct from 1 July 2026.

A worker should be able to tell what benefit or condition is disputed, the legal provision relied on, the factual and medical findings made, and what review or dispute options are stated. A letter that merely says the insurer has “changed its position” should be compared with the current notice requirements rather than answered by guesswork.

The provisional-liability system is designed to provide early support without waiting for the full investigation. The 1998 Act provides that provisional payments are not an admission of liability. An insurer may therefore obtain employment, medical or factual material and later accept or dispute the formal claim.

That does not make the provisional notice irrelevant. It records what was notified, when the insurer became involved, what it initially understood the injury to be and what payments were made. Preserve it with the later decision and the reports obtained in between.

A later dispute after full acceptance requires closer document analysis. Prior acceptance may be important to the factual history and to the legal effect of the later decision. Whether an insurer, agreement or PIC determination has finally decided the same issue cannot be answered from the word “accepted” alone. It depends on the earlier document, the issue now raised and the statutory power used.

Do not assume that full acceptance permanently guarantees every payment or that the insurer can simply erase the earlier decision. Ask the insurer to identify the precise later decision and all evidence relied on. Legal advice may be useful where the same causation issue appears to be reopened or the notice conflicts with an agreement, award or Medical Assessment Certificate.

• What exactly was accepted earlier: injury, diagnosis, body part, incapacity, treatment or payment period?
• Was that acceptance provisional, final, agreed or determined by the Commission?
• What does the new notice dispute, and from what effective date?
• Which Act section, medical report, factual material or earnings evidence supports the change?
• Does the evidence concern a genuinely new issue or repeat an issue already decided?
• Will weekly payments or treatment change before a review or PIC application can be determined?

Build one chronological file rather than responding only to the latest letter. Include the original notification, claim form, provisional notice, liability acceptance, Certificates of Capacity, treatment approvals, payment history, insurer calculations, later section 78 pack and every report listed in the reasons. Keep any complying agreement, permanent impairment agreement, PIC order or Medical Assessment Certificate separately.

If the later dispute concerns causation or a body part, obtain a medical report that addresses the exact diagnosis, history and insurer reasoning. If it concerns weekly payments, preserve PIAWE calculations, payslips, rosters, duties and work capacity material. The evidence needed follows the decision actually made.

A written insurer review can be useful where a clear error can be corrected with targeted evidence, but it is not a universal substitute for a PIC application. IRO can deal with complaints about insurer conduct and may fund legal help through ILARS for an eligible workers compensation matter, subject to approval. The Personal Injury Commission determines defined legal and medical disputes within its jurisdiction.

The correct next step depends on the notice. A liability dispute, work capacity decision, PIAWE decision, treatment dispute and permanent impairment dispute do not all use the same form or review route. Act promptly because notice and payment provisions can be time-sensitive even where no single deadline applies to every case.

A warehouse worker receives provisional weekly payments for a reported back injury. After reviewing CCTV, clinical records and the employer account, the insurer later issues a section 78 notice disputing the formal claim. The worker should not argue only that money was previously paid: provisional payment was not final acceptance. The useful response compares the insurer reasons with the incident evidence and medical chronology.

In a different situation, an insurer has fully accepted a knee injury for several months and later refuses a proposed shoulder operation. The first question is whether the shoulder was ever accepted and whether it is alleged to arise from the same accident or consequentially. The example illustrates issue identification only; it does not predict either claim outcome.