The Department of Home Affairs is downplaying fears of a healthcare "crisis" among refugees on Manus Island.
The government has been slammed for a lack of transparency amid news that the healthcare provider for refugees on Manus Island will wrap up its work on Monday.
The International Health and Medical Services (IHMS) has been providing healthcare for refugees on Manus for several years but their contract is due to expire on April 30.
However, despite the looming end date, the government did not publicly indicate a new provider was confirmed until Friday. Although details still remain scant.
In a statement to SBS News, the Department of Home Affairs said it had "engaged a new health services provider from 1 May 2018 (and) IHMS will work with the new health service provider during a transition period".
"Individuals will continue to have access to appropriate primary health services," it said.
A spokesperson from IHMS confirmed the April 30 end date but said "it will, however, maintain a core group of staff in Manus and Port Moresby to support the transition to a new health service provider".
But neither the Department of Home Affairs or IHMS would say who the new provider is, leaving open questions about the quality of the care.
Greens senator Nick McKim told SBS News Australians are once again "in the dark" about the treatment of refugees on Manus.
Mr McKim said getting information from the Department of Home Affairs was "like getting blood from a stone".
"And of course that's deliberate and part of the intent of establishing Australia's offshore detention system in the first place - to drop a veil of secrecy over what's happening in those places."
He said although IHMS had a very checkered history, there is now a danger of gaps in health care over the coming months and beyond.
"Ultimately the risk is yet more people will come to harm ... as a result of Peter Dutton's negligence."
Mr McKim said the use of Manus and other offshore immigration detention facilities will go down as "one of the darkest chapters" in Australian history.
"Because it's very rare that in Australia's history we've deliberately caused harm to innocent people and that's exactly what Peter Dutton is doing."
Refugee coordinator at Amnesty International Australia Graham Thom similarly expressed concerned around healthcare for those on Manus after April 30.
"Ever since the Australian government began shipping refugees out to detention centres on remote tropical islands, they have been trying to hide from the consequences of this cruel policy."
"Withdrawing healthcare is Australia's latest deplorable attempt to shift the responsibility for the suffering it has caused."
"The health situation for refugees and asylum seekers in Papua New Guinea is already dire, but the end of the IHMS contract threatens to turn this into an all-out crisis."
"The only way for Australia to ensure the health of the refugees and asylum seekers on Manus is to end offshore processing for good."