Insurance Australia Group Limited t/as NRMA Insurance v Keen

In this case, the plaintiff, Insurance Australia Group Limited trading as NRMA Insurance, sought judicial review of a decision made by an independent medical assessor regarding a motor accident claim. The defendant, Keen, argued that the assessor had failed to properly address the causation and apportionment of his injuries, particularly in relation to a pre-existing condition. The matter was heard in the Federal Circuit Court of Australia. The central legal issue revolved around whether the decision of the medical assessor contained a jurisdictional error or an error of law that warranted judicial review. Specifically, the court had to determine if the assessor's failure to properly consider the causation and apportionment of injuries constituted a jurisdictional error, and whether the lack of adequate reasoning by the assessor was sufficient to vitiate the decision. Additionally, the court considered whether the failure to exercise jurisdiction and apply the correct legal test constituted a jurisdictional pre-condition for review.

The Federal Circuit Court held that the decision of the medical assessor did not contain a jurisdictional error or an error of law warranting judicial review. The court found that the assessor had considered the causation and apportionment issues, albeit with some shortcomings in reasoning. The court emphasised that the decision-maker was not required to provide detailed reasons for their findings but needed to demonstrate a rational process in reaching their conclusion. The court also noted that the failure to exercise jurisdiction and apply the correct test did not, in itself, establish a jurisdictional pre-condition for review. Furthermore, the court dismissed the plaintiff's capacity to challenge the original decision after an internal refusal to refer for review, holding that the summons was not the appropriate procedural vehicle for such a challenge.

The court ultimately dismissed the summons, affirming that the decision of the medical assessor did not warrant judicial review. The reasoning provided by the assessor, though not ideal, was sufficient to satisfy the requirements for a rational decision-making process. The court underscored the importance of ensuring that the decision-maker applies the correct legal test and exercises their jurisdiction properly, but found that the shortcomings in this case did not rise to the level of a jurisdictional error or error of law. The plaintiff's challenge to the original decision post internal refusal to refer was also dismissed, clarifying the procedural avenues available for such challenges.