Insurance Australia Ltd v Marsh

Insurance Australia Ltd (the appellant) appealed to the Court of Appeal of New South Wales against a decision of the primary judge concerning the interpretation and application of section 63(3) of the *Motor Accidents Compensation Act 1999* (NSW). The dispute arose from a decision by a proper officer of the Motor Accidents Authority (now the State Insurance Regulatory Authority) to decline to refer a medical assessment to a review panel, despite the presence of conflicting medical opinions. The primary judge had found that the proper officer erred and ordered that the matter be referred to a review panel.

The central legal issues before the Court of Appeal were whether the proper officer had exceeded their statutory role by determining the asserted material error in the medical assessment on its merits, and whether the existence of significant differences of opinion among medical practitioners necessarily constituted reasonable cause to suspect a material error. The court was also required to consider whether the primary judge erred in ordering a referral to a review panel rather than remitting the matter back to a proper officer.

The Court of Appeal reasoned that section 63(3) of the Act required the decision maker to consider whether there was reasonable cause to suspect a material error, not to determine the existence of such an error on the merits. The court held that the presence of conflicting medical opinions did not, in itself, automatically create reasonable cause to suspect a material error. The decision maker was entitled to form a view on the weight of the evidence presented. Consequently, the court found that the proper officer had not exceeded their statutory authority by declining to refer the matter to a review panel.

The Court of Appeal allowed the appeal, set aside the orders of the primary judge, and dismissed the summons. The first respondent was ordered to pay the appellant's costs of the appeal and was granted an indemnity certificate.