The health care provider International Health and Medical Services (IHMS) says it has been granted a temporary license for its clinic to operate at Australia's refugee detention centre on Papua New Guinea's Manus Island.
The company says its staff have also been given authority to practice by the PNG Medical Board.
Last week, the company stopped operating at the centre following a protracted dispute with the PNG government over the clinic's registration.
It was accused of operating without a license and of breaking laws regarding labour, tax evasion and immigration.
The company has refuted those allegations.
In 2015, a Guardian investigation revealed the company had failed to meet medical targets and deliberately included incorrect data in reports to the Australian immigration department.