Depending upon your annual income you may need to pay Medicare levy surcharge, if you are on a working visa. To avoid that you can purchase the Reciprocal Health cover in addition to your Overseas visitor cover. At the end of financial year, you will receive a tax statement of the cover which can be provided to the Australian Tax office and receive exempt from paying Medicare levy Surcharge.

Reciprocal health cover + OVHC = No Medicare levy surcharge.