About BAYARD W. CHANG, MD, INC. Bayard W. Chang, Md, Inc is a primary care provider established in Sacramento, California specializing in clinic/center (primary care) . The NPI number of Bayard W. Chang, Md, Inc is 1619062973 and was assigned on October 2006. The practitioner's primary taxonomy code is 261QP2300X with license number G064347 (CA). The provider is registered as an organization ....