Beijing CDC. In Changping, Beijing, the cheaper place to get a health certificate is Beijing CDC. Changping District, which belongs to Beijing, is located in the northwest of Beijing, bordering Yanqing District and Huairou District in the north, Shunyi District in the east, Chaoyang District and Haidian District in the south, and Mentougou District and Huailai County in Hebei Province in the west.