All of the deaths were in Hubei Province, according to the National Health Commission.
Meanwhile, 41 new suspected cases were reported, said the commission.
Also on Sunday, 838 people were discharged from hospital after recovery, while the number of severe cases decreased by 194 to 3,032.
The overall confirmed cases on the mainland had reached 80,860 by the end of Sunday, including 9,898 patients who were still being treated, 67,749 patients who had been discharged after recovery, and 3,213 people who died of the disease.
The commission said that 134 people were still suspected of being infected with the virus.
The commission added that 9,582 close contacts were still under medical observation. On Sunday, 1,316 people were discharged from medical observation.
Twelve imported cases were reported on the mainland Sunday. Among them, four were reported in Beijing, four in Guangdong Province, two in Shanghai, one in Yunnan Province and one in Gansu Province. By the end of Sunday, 123 imported cases had been reported, said the commission.
By the end of Sunday, 148 confirmed cases including four deaths had been reported in the Hong Kong Special Administrative Region (SAR), 10 confirmed cases in the Macao SAR, and 59 in Taiwan including one death.
A total of 84 patients in Hong Kong, 10 in Macao and 20 in Taiwan had been discharged from hospital after recovery.