Sadly, the government has decided you are no longer able to claim your treatments on your extras cover from 2019. It is outrageous in terms of limiting your freedom to seek health services of your choice and be covered by your health insurer. It gets even more outlandish when you view this as preventative care which has been shown to clearly prevent much greater costs down the line. Think of it as brushing your teeth. Common sense sure is becoming uncommon.
In my mind the best way forward is to write to the minister expressing your opinion. My assocoation ATMS has made this process very simple via this web site: https://www.howdarethey.com.au