Marion L. Guyer, MD

Marion Guyer, MD, is a board-certified internal medicine physician, with a concierge primary care medical practice in Marin County, CA. She shares a practice with Dr. Anne Cummings, board-certified in internal medicine. 

Dr. Guyer is a graduate of Yale University. She attended medical school at the University of California, San Francisco, and completed her residency in 2000 at the Alameda County Medical Center in Oakland, CA. Dr. Guyer also earned a Master of Public Health at the University of California, Berkeley, and a Masters of Business Administration at the Presidio Graduate School. She completed a Primary Care Behavioral Health fellowship at the University of California, Davis.

Dr. Guyer combines expertise in internal medicine with an integrative, holistic approach to treating a wide range of conditions. Warm, attentive, and clinically astute, she partners with patients to create preventive care plans, manage complex medical diseases, and support goals to enhance overall well-being. As a seasoned physician, she draws on her expertise in hospital medicine, exercise physiology, nutrition, mind-body medicine, functional medicine, and cognitive behavioral therapy.

Dr. Guyer offers a full array of personalized preventive health screenings, including:

• Boston Heart Advanced Lipid panel
• Coronary Calcium CT scanning
• Myriad Genetic Cancer Screening
• Prenuvo full and partial body MRI
• Microbiome gut testing
• Spirometry Lung testing
• InBody Scanning for body composition (muscle, fat, BMI).