The list includes Thailand and Japan, which have together reported three cases of the disease in people who had come from Wuhan.
In the most recently diagnosed group, ages ranged between 30 and 79, Wuhan's health commission said. Their initial symptoms were fever and cough.
The health commission's statement did not say whether these patients had visited the Huanan Seafood Wholesale Market, which has been suspended after many infected individuals reported having either worked at or visited the venue.
Health authorities have maintained that there is no evidence that the virus transmits easily between humans.
The Chinese government is keen to avoid a repeat of SARS, or severe acute respiratory syndrome, another coronavirus that started in southern China in late 2002 and spread to more than two dozen countries, killing nearly 800 people.
- AP