Dr. Narayan was born in New Delhi, India and immigrated to America at the age of nine. He was raised in New Jersey, and graduated with “Highest Honors” from Rutgers College with a major in Microbiology and a minor in Psychology. After graduating in 1986 from Cornell University Medical College, where he was elected to the prestigious Alpha Omega Alpha medical school honor society, he moved to California to do his residency in Internal medicine at the University of California, San Francisco (UCSF). He completed his Gastroenterology Fellowship at UCLA and did an additional year of training in advanced endoscopic procedures at the Cleveland Clinic. Since then he has been engaged full time in the private practice of gastroenterology and has previously taught at UCSF. While he has special expertise in advanced procedures, such as ERCP and endoscopic ultrasound, he takes the greatest pride in taking the time in educating his patients about their condition.
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: Cornell University
Residency: Internal Medicine – University of California, San Francisco (UCSF)
Fellowship: Gastroenterology – University of California, Los Angeles (UCLA)