Patient Portal. Sign in to access your private medical information. Directions. Maps to the OAM office and our surgery locations. ... Grand Haven Office. 1445 Sheldon Road, Suite G1 Grand Haven, Michigan 49417 616-296-9100. Grand Rapids Office (Trauma) 260 Jefferson Ave SE Ste 115Medical Team‧Contact Us‧Knee‧First Visit‧Specialties‧Mako.