Chinese patients are accustomed to seeking medical advice on the Internet, which has a deep penetration in the country.
Some private hospitals have launched Internet services offering online diagnoses.
Song Shuli, spokeswoman for the National Health and Family Planning Commission, said that these services could be misused to provide medical assistance by people who are unqualified in medicine, unlike face-to-face diagnosis.
Song only referred to services provided to individuals. Consultations between hospitals and doctors are not banned, state-run Xinhua news agency reported.
Patients must register before accessing the services.
Song said the regulator will continue to improve policies guaranteeing the reliability of online medical services.