An interstate psychiatrist has been brought in to conduct an external review of the medical discharge of four mental health patients in Adelaide's south. The four patients had a significant incident shortly after leaving hospital last year.

The South Australian Chief Psychiatrist John Brayley has recruited former ACT chief psychiatrist Peter Norrie to examine whether there were mistakes made during the discharge process.

Principal Community Visitor Maurice Corcoran welcomed the independent review and says he hopes everyone can learn from the individual case and pick up on whether there are any issues or concerns around the transfer of responsibilities and the case management so can help prevent it in the future.