Iraq hopes to raise billions of dollars in pledges at the three-day meeting, as the country reels from the rise of ISIS and punishing fightback against the terrorist group.
Baghdad declared victory against ISIS in December, after almost three years of war against the terrorist group that left large swathes of the country destroyed and millions displaced.
The $88.2 billion estimate was based on an assessment study by Iraqi and international experts, the planning minister said.
Qusai Abdelfattah, director general at the planning ministry, said $22 billion of those funds were needed immediately and the rest for the medium term.
He said funds are urgently needed to "restore basic and infrastructure services" in many provinces.
"We have more than 138,000 houses damaged, more than half this number completely destroyed," Hiti said, adding that more than 2.5 million Iraqis are still displaced.
Since the 1980s, resource-rich Iraq has been battered by war and international economic sanctions.
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