The new cases of the H7N9 strain bring the total number of reported cases to 60 as of April 14, the agency reported.
Authorities believe the virus is being spread through direct contact with infected poultry.
The World Health Organisation (WHO) said there was no evidence yet of human-to-human transmission.
Michael O'Leary, the WHO's representative in China, said cases did not appear to be connected.
"There's no way to predict how it will spread but it's not surprising if we have new cases in different places like we do in Beijing," he told reporters.