John Muir Health Walnut Creek Medical Center
Ross Pirkle, M.D., is a board-certified internal medicine physician. He has worked for John Muir Health for 17 years and has served two terms as chair of medicine at John Muir Walnut Creek. He was trained and educated at the University of California, Berkeley and the University of California, San Francisco, where he still maintains many of his collegial relationships. Being an advocate for physical exercise, Dr. Pirkle enjoys helping patients with their personal health and fitness goals. Dr. Pirkle is an avid runner, swimmer, Ironman triathlete and father of four, so he can understand the challenges of making health a priority in a busy life. Dr. Pirkle firmly believes that for patients to achieve optimal health, a plurality of therapies such as chiropractic, Eastern medicine, behavioral health, rehabilitation therapies, and body work, may all be necessary. Dr. Pirkle is a founding partner of Cornerstone Primary Care in Walnut Creek. The office opened in August of 2015 and is affiliated with BASS Medical Group.
Dr. Audrey "Lisa" Arzamendi is double board-certified in internal medicine and endocrinology. Since 2012, she has specialized in diabetes, obesity and metabolism, thyroid disease (including Hashimoto's and Graves'), polycystic ovary syndrome (PCOS) and sex hormone disorders, adrenal and pituitary dysfunction, osteoporosis, parathyroid/calcium disorders, and thyroid and parathyroid nodules and cancers. She is highly trained in ultrasound-guided fine-needle aspiration (FNA) biopsy of the thyroid (99% diagnostic rate).
Dr. Arzamendi is committed to safe and established medical treatments, and prides herself on staying informed about emerging therapies and research-supported non-prescription options. She is experienced working with all forms of brand-name and generic thyroid medications, and as a type 1 diabetic herself, has first-hand knowledge of nearly all available prescription and technological diabetic treatments, to best support patients in selecting their optimal diabetes treatment regimens.
Dr. Arzamendi graduated with honors from Stanford University, with a BA in Human Biology and a concentration in Health & Human Performance. She attended UC San Diego School of Medicine (receiving a federal NIH National Cancer Institute fellowship), and completed her internal medicine residency at Kaiser Pemanente’s Santa Clara Medical Center. Her endocrinology training was completed at UC Davis Medical Center. She previously practiced in California's South Bay before relocating to open her practice in Walnut Creek in 2020. Dr. Arzamendi was a Stanford varsity athlete and still enjoys running, hiking, tennis, rowing, and other outdoor activities. She loves spending time with her husband and many pets, and looks forward to being your doctor!
Medical School: University of California San Francisco