Medical insurance and social security are not the same thing.
Shanghai, District and County Medical Insurance Centers
Consultation telephone number of medical insurance agency
Huangpu District Medical Insurance Center 632 15 132
Jiading District Medical Insurance Center 599 15420
Luwan District Medical Insurance Center 63872028
Pudong New Area Medical Insurance Center 508 1 17 19
Xuhui District Medical Insurance Center 64079057
Nanhui district medical insurance center 58027555
Changning District Medical Insurance Center 6225652
Fengxian District Medical Insurance Center 574 17267
Jing 'an District Medical Insurance Center 62663058
Songjiang District Medical Insurance Center 577 15696
Putuo District Medical Insurance Center 52804754
Jinshan District Medical Insurance Center 57938934
Zhabei District Medical Insurance Center 6654 1 100
Qingpu District Medical Insurance Center 597285 12
Hongkou District Medical Insurance Center 6364 1492
Chongming county medical insurance center 396 12037
Yangpu district medical insurance center 654 19450×2487
Farm Bureau Medical Insurance Center 34230 194
Minhang District Medical Insurance Center 64926579
Municipal Medical Insurance Affairs Center 62 1575 19
Baoshan District Medical Insurance Center 56 1 12534
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.