If you're going overseas , I'd highly recommend you take out proper comprehensive travel insurance.
But if you prefer to take the risk - I found this link from medibank that gives you 2 weeks of overseas MEDICAL only travel insurance ($250 excess) . Make sure you read the PDS
Extract:
You're eligible for 2 weeks FREE International Medical Only travel insurance^, which includes unlimited overseas hospital and medical expense cover1.
To activate this offer, simply enter your travel details. For trips longer than 2 weeks, just pay the difference for the additional days. You also have the option to upgrade to comprehensive cover.
T&C
^Based on a 14 day, international medical only policy with a $250 excess
~ The premium of the policy will be subtracted from the full price of the policy for the duration selected. So if you purchase a 17 day policy, you'll only pay for the difference between a 14 day policy and 17 day policy.
1 - Medical cover will not exceed 12 months from the onset of the illness or injury. Reduced limits may apply for customers 70 years or over. Limits will be shown on the Certificate of Insurance. Medical evacuation cover subject to claim approval.
2 - Conditions apply to cancellation cover. Only applies to the International Comprehensive and Domestic policies. Reduced limits may apply for customers 70 years or over.
3 - Item limits apply. See page 11 of Combined FSG/PDS for more information.
4 - Cover is included for your children or grandchildren identified on the Certificate of Insurance and travelling with you on your Journey provided they are not in full time employment, are financially dependent on you, and they are under 21 years of age.
Not really free considering how much more expensive they are.