Not sure if anyone knows this, but with some australian health insurance policies, you are covered if you travel overseas (if it is within 6 months of leaving the country, and if it is covered as a normal component of your insurance).
My health insurance covers up to $7,500 - which is handy if you dont have enough cover with your travel insurance.
Of course, you would need to have private health insurance, and it would need to be a policy that covers travel (you'd need to check your own policy).