Southern Cross Health Society, the not-for-profit health insurer, saw its surplus increase sharply in the year ended June 30, as premium income rose much faster than claims from members.
The Auckland-based mutual posted a surplus of $35 million, up from $5.8 million.
Income from premiums rose by 6 per cent to $871 million from $818 million, the third year in a row that premium income has risen by about 6 per cent. In that time membership has remained steady, moving between around 810,000 and 820,000 members.
Government data shows health insurance premiums have risen by an average of 7.4 per cent on an annual basis over the past three years.
In 2015, chairman Greg Gent said the cost of providing health care had risen by 6.2 per cent, driven by the increasing number of claims, the growing cost of procedures, an aging population and the greater range of treatments that are available.