Satisfaction with private health insurers has declined to 2013 levels, as survey results show more than 10 per cent of Australians plan to leave their funds in the next 12 months and are shopping around.

The results, from Roy Morgan's Single Source survey of more than 50,000 Australians, found nearly all major health insurance providers had shown declining customer satisfaction in the past year, with overall satisfaction at 74.4 per cent, down from 76.3 per cent at the same time last year.

Over the past three years, HBF has maintained the highest satisfaction level of the five largest funds at 80.2 per cent, followed by HCF (74.3 per cent), Bupa (73.6 per cent), NIB (70.9 per cent) and Medibank Private (70.1 per cent).

Satisfaction scores with most of the largest 16 funds decreased in the past year.