The excellent news is that the government has a dedicated website for you to use. To compare policies, all you need is the type of cover you want, who the policy will cover, and where you live. PrivateHealth.gov.au (http://privatehealth.gov.au/)contains details of every health insurance policy available in Australia.
https://www.health.gov.au/resources/apps-and-tools/compare-health-insurance-policies(https://www.health.gov.au/resources/apps-and-tools/compare-health-insurance-policies)