Wuhan, the epicenter of the coronavirus outbreak in China, has revised upwards the number of confirmed coronavirus cases and deaths in the city after "a city-wide investigation," state media reported.

The Wuhan government said total confirmed infections in the city have been revised to 50,333 as of Thursday, an increase of 325 cases, while the cumulative number of deaths is now 3,869 — 1,290 more than its previous count, according to CNBC's translation of a Chinese language report by Xinhua News Agency.

Following the revision by Wuhan, China's National Health Commission said Friday that the death toll in mainland China has been revised from 3,342 to 4,632. Meanwhile, total confirmed cases have been revised from 82,367 to 82,692, the NHC said.

Xinhua posted a notice from the Wuhan government, which listed four explanations for the discrepancy in the city's data.