On Friday, Hubei's health commission said another 116 people had died and more than 4,800 new cases were reported.
In its latest update, China's National Health Commission said it had recorded 121 new deaths and 5,090 new coronavirus cases on the mainland on February 13, taking the accumulated total infected to 63,851 people.
The skyrocketing number of new cases in Hubei comes after health officials announced Thursday they had begun including people diagnosed using new clinical methods in official statistics.
Almost 64,000 people are now recorded as having fallen ill from the virus in China, with officials revealing that 1,716 health workers had been infected as of Tuesday.
The latest report brought the total confirmed cases in Hubei province to 51,986, state-run Xinhua news agency reported.More news: Google accidentally posts Android 11 dev preview page, then takes it down
The WHO said the numbers included cases going back weeks.
"We're not dealing, from what we understand, with a spike of 14,000 on one day", Dr. Ryan said. It was the third reported death outside of mainland China.
The death toll from China's virus epidemic neared 1,400 on Friday with six medical workers among the victims, underscoring the country's struggle to contain a deepening health crisis.
Several countries have banned arrivals from China, while major airlines have halted flights to and from the country.
Japan confirmed its first coronavirus death on Thursday - a woman in her 80s living in Kanagawa prefecture near Tokyo.More news: Valencia midfielder Kondogbia: Pogba will fight-back at Man Utd
Forty-four more passengers aboard the Diamond Princess have tested positive as the cruise ship remains docked and quarantined near Yokohama, Japan.
The outbreak has wreaked havoc with global events, with the World Mobile Congress in Spain cancelled and the Hong Kong Rugby Sevens tournament and Formula One Grand Prix in Shanghai postponed. The ship has been linked to 218 cases, making it the largest cluster outside of China.
The number of new cases in Hubei Province included 3,095 clinically diagnosed cases, which have been seen as confirmed cases.
Officials said the epidemic is still intensely centered in China.
The outbreak has led to the firing of Jiang Chaoliang as the ruling Communist Party chief in Hubei, just days after the province's top two health officials were removed from their posts.More news: Johnson reshuffles cabinet ahead of European Union deal
Wuhan has been hit hard by COVID-19 because the outbreak started in Hubei and spread locally. Health officials in Hubei, the epicenter of the 2-month-old outbreak, said they changed their detection methods from a laboratory test to computerized body scans.