Twenty-one of the imported cases were in Beijing, which now has more than a third of the country's 189 confirmed infections from overseas.
China has now recorded a total of 80,928 confirmed virus cases with 3,245 deaths.
China on Thursday said that there had been no cases of domestic coronavirus infections in the country the previous day, for the first time since the outbreak began.
The NHC said the number of imported cases in China rose to 189 with 34 confirmed cases from the people arriving from overseas.
China has counted 189 "imported" infections so far, meaning they were discovered in people who had traveled overseas, as opposed to locally transmitted infections.
Also on Wednesday, eight deaths and 23 newly suspected cases were reported on the mainland with all deaths reported in Hubei Province. Non-transit travellers are sent to designated sites for a compulsory 14-day quarantine.
Of the 34 imported infections, Beijing accounted for 21 cases, a daily record for the city.
China's aviation regulator said on Thursday it would divert some worldwide flights bound for Beijing to other cities.
The virus is believed to have emerged in an animal market in the central Chinese city of Wuhan in December.
China tentatively plans to hold late in April or early in May its annual gathering of parliament, two people involved in preparations told Reuters, after a delay, caused by the outbreak, from an initial date of early March.
Wuhan reported no new cases on Wednesday for the first time since the outbreak.
Officials in Beijing wouldn't say how the virus jumped to other countries, but they say the measures may be behind the recent reduced infections, as well as few cases reported in Africa being linked to China directly.
Shanghai on Thursday expanded the list of countries from which travellers have to undergo a 14-day quarantine to 24 countries, eight more than previously. All deaths were reported in Hubei Province, state-run Xinhua news agency reported.