If the initial psychiatrist:
then a second opinion may be sought from a psychiatrist on the second opinion list for each State, or from another State that has psychiatrists willing to do video conferencing.
The second opinion psychiatrist should be sent:
The referral letter should clearly state why the second report is being sought (ie, that you are not able to confirm a diagnosis of PTSD; or that the traumatic event identified by the claimant conflicts with known facts; or that the claimed deterioration of the condition has not been satisfactorily explained; or that the first psychiatrist refused to address the conflicting evidence). Before requesting the second opinion, the claims assessor must advise the claimant and the representative (if applicable) of the intention to do so.
Links
[1] https://clik.dva.gov.au/user/login?destination=node/21521%23comment-form
[2] https://www.fedcourt.gov.au/law-and-practice/guides/expert-evidence