According to the medical charity, nine of Mosul's 13 public hospitals were damaged during the nine-month battle, causing the city to lose around 70 percent of its hospital beds.
"The city's population is increasing by the day. In May 2018 alone, almost 46,000 people returned to Mosul. But the public health system is not recovering and there is a huge gap between the available services and the needs of the growing population."
Nagarathnam also highlighted the urgent need to provide care for those suffering from mental trauma following Mosul's period of IS rule and the devastating assault on the city by Iraqi forces.
In recent days, the situation in Mosul has been further complicated by an apparent upsurge in IS attacks.
This has included the kidnappings of at least 46 civilians, security officers, and tribal fighters. Twenty of those taken captive were reportedly executed.
IS bombings and ambushes on security forces and civilians in Iraq have also added to the existing danger of unexploded bombs and booby traps that remain from the battle that ended last year.
The group urged the international community to "urgently rebuild public health infrastructure, provide patients with access to affordable medication and ensure medical facilities are supplied with the necessary equipment".
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