MACON GEORGIA. Kathy C. Lynn, MD Rheumatologist. PATIENT PORTAL. PH: (478) 742-0483 Fx: (478) 742-0439. KATHY C. LYNN, MD. Hospital Affiliations. Atrium Health Navicent . BOARD CERTIFIED. Dr. Lynn is Board Certified in Rheumatology by the American Board of Internal Medicine and in Rheumatology and Internal Medicine by the National Board of ....