Directions to AdventHealth Medical Group Multispecialty at South Asheville. 15 Skyland Inn Drive. Arden, NC 28704. Call AdventHealth Medical Group Multispecialty at South Asheville at. 855-774-5433. HENDERSONVILLE. Directions to AdventHealth Medical Group Multispecialty at Medical Office Building 50 Hospital Dr. Ste 2D. HENDERSONVILLE, NC 28792..