Johnston Medical Associates – Clayton

Johnston Medical Associates – Clayton offers easy access for residents in western Johnston County and Wake County. Located on the campus of Johnston Health Clayton, patients have easy access to a variety of outpatient lab and imaging services if necessary. We welcome patients of all ages.

Our physicians are now part of the UNC Physicians Network. UNCPN provides physician practices the operational support to allow them to do what they do best – provide quality patient care. Practices affiliated with UNCPN have access to additional operational support, specialty and subspecialty care providers and the health care system’s electronic medical records system. Find out more here.

Your Providers


Mark Bowling, MD

Mark Bowling, M.D. earned his medical degree from the University of Louisville and is certified by the American Board of Family Medicine. He specializes in family medicine and general practice, and has been with Johnston Health for 10 years.


NguyenMai Trang Nguyen, MD

Mai Trang Nguyen, M.D., of Cary, has 13 years of experience in treating chronic and acute illnesses. Prior to joining Johnston Health, she was the director of Optimus Health Group in Raleigh, an internal medicine, primary and urgent care practice. She is a graduate of the University of Massachusetts Medical School. She completed her internal medicine residency at UMass Memorial Medical Center.

Dr. Nguyen emphasizes preventive care and enjoys treating patients who have diabetes and other chronic illnesses. She thinks that patients should be at the center of their treatment plans. “It’s important that they understand their disease process, their medications and how they can contribute toward optimizing their health. It is rewarding to see results,” she says.

Carla Bennett, FNP-BC
Carla Bennett, F.N.P., is our newest provider and earned her Nurse Practitioner License from the University of Michigan.




Anna Bruton, NP
Anna earned her Nurse Practitioner license from East Carolina University and is certified by The American Academy of Nurse Practitioners.





Please call 919-585-8850 to schedule an appointment.

We make every attempt to schedule appointments both with new patients and established patients as quickly as possible, particularly if there is a current medical concern. If you have an urgent medical problem, you will be scheduled for the first available appointment. You may need to see a provider other than your primary care provider. If you are not able to make your scheduled appointment, please notify us within 24 hours. Please bring all of your medications to each appointment. We require 24 hour notice for prescription refills.

Most insurance, Medicare and Medicaid are accepted.

Monday through Thursday
8:00 a.m. till 5:00 p.m.
8:00 a.m. till 12:00 noon

Click here for a copy of our New Patient Forms.

My UNC Chart

If you are a patient of one of our Primary/ Family Care practices, QuickMed Urgent Care, or Internal Medicine departments, you can access your health information and make payments through My UNC Chart. Click the button below to access your login or sign up as a First Time User.


Contact Us

Johnston Medical Associates – Clayton
Johnston Professional Plaza
2076 Hwy. 42 W., Suite 330
Clayton, NC 27520
(p) 919-585-8850
(f) 919-585-8869