Genesys Regional Medical Center One Genesys Parkway, Suite 1595 Grand Blanc, MI 48439 (810) 606-9190. Clarkston 5900 Walden Rd Ste D, Clarkston MI 48346 (248) 922-0615. Davison 1260 N. Irish Rd., Ste C, Davison 48423 (810) 653-0388.