Coroner Terry Ryan said the leg infection of Hamid Khazaei, 24, that led to his death could be treated if it had been recognized, ABC reported on its website.
The Iranian asylum seeker suffered severe sepsis from a leg infection and was first moved to Port Moresby before being flown to Brisbane where nothing could be done to save his life in 2014.
He found the Australian Government had not met its responsibility to detainees such as Khazaei to provide health care, the report said.
Mr Ryan in his 140-page report called for mandatory judicial investigations of deaths that take place on Australia's watch, but in overseas jurisdictions.
Khazaei's death was the result of a series of clinical errors, compounded by failures in communication that led to poor handovers and significant delays in his retrieval from Manus Island', according to the coroner.
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