MLC Limited v O'Neill

MLC Limited appealed to the New South Wales Court of Appeal against a decision of the Supreme Court of New South Wales concerning a life insurance policy issued to Mr. O'Neill. The dispute centred on whether Mr. O'Neill's death was caused by a "Heart Attack" as defined in the policy, which required the diagnosis to be based on an electrocardiogram and biochemical assessment.

The Court of Appeal was required to determine whether the Supreme Court had erred in finding that Mr. O'Neill's death satisfied the policy's definition of a "Heart Attack," notwithstanding that the medical evidence did not definitively establish the required diagnostic criteria. Specifically, the court had to consider the interpretation of the policy's terms and the sufficiency of the evidence presented to establish a myocardial infarction.

The Court of Appeal found that the Supreme Court had misconstrued the terms of the insurance policy. Their Honours held that the definition of "Heart Attack" was clear and unambiguous, requiring both an electrocardiogram and biochemical assessment for a diagnosis to be valid under the policy. As the medical evidence presented did not meet these specific diagnostic requirements, the Court of Appeal concluded that the conditions for a "Heart Attack" under the policy had not been satisfied.

The appeal was allowed.