What does the Reciprocal Health Care Agreement mean in the PDS?

'Reciprocal Health Care Agreement' means an agreement between the Government of Australia and the government of another country where residents of Australia are provided with subsidised medically necessary treatment. The type of subsidised essential medical treatment may differ between countries and require you to make a co-payment. 

The list of countries that Australia has Reciprocal Health Care Agreement Agreements with can be found at www.smarttraveller.gov.au.