Gastroenterology in Walnut Creek, California
Data updated monthly · Last refresh September 2026
33 Gastroenterology providers practice in Walnut Creek, and 55% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.
Gastroenterology providers in Walnut Creek
Listed alphabetically. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.
Dr. Christine Shieh, MDWalnut Creek, CA · $305 in drug and device payments (2025) ·
(925) 296-7340 Dr. Cynthia Mullen, M.D.Walnut Creek, CA · $684 in drug and device payments (2025) · Telehealth ·
(925) 322-2372 Dr. Daniel Chung, MDWalnut Creek, CA · $19 in drug and device payments (2025) ·
(925) 295-4000 Dr. Daniel Yu, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. David Lin, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 831-9200 Dr. Drew Schembre, MDWalnut Creek, CA · $56,604 in drug and device payments (2025) · Telehealth ·
(925) 296-7340 Dr. Erin Wolf, MDWalnut Creek, CA · $249 in drug and device payments (2025) ·
(925) 296-7340 Dr. Eugene Chan, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Gerald Tarder, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 938-6060 Dr. Henry Kung, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 945-6070 Dr. Hongha Vu James, M.D.Walnut Creek, CA · $294 in drug and device payments (2025) ·
(925) 296-7340 Dr. Kanwar Gill, M.D.Walnut Creek, CA · $56,655 in drug and device payments (2025) · Telehealth ·
(925) 296-7340 Dr. Katharine Ozeki, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4080 Dr. Maher Tama, M.D.Walnut Creek, CA · $20 in drug and device payments (2025) ·
(925) 296-7340 Dr. Martha Turchyn-mazuryk, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Matthew Chin, M.D.Walnut Creek, CA · $142 in drug and device payments (2025) · Telehealth ·
(925) 296-7340 Dr. Mervyn Becker, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 708-4419 Dr. Ming Fang, MDWalnut Creek, CA · $823 in drug and device payments (2025) · Telehealth ·
(925) 776-7600 Dr. Oliver Lin, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4080 Dr. Omar Al-shuwaykh, M.DWalnut Creek, CA · $974 in drug and device payments (2025) · Telehealth ·
(925) 295-5758 Dr. Rishi Sharma, M.D.Walnut Creek, CA · $1,155 in drug and device payments (2025) · Telehealth ·
(925) 932-6330 Dr. Rohit Anand, MDWalnut Creek, CA · $828 in drug and device payments (2025) · Telehealth ·
(925) 296-7340 Dr. Sam Saeed Zamani, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-5599 Dr. Shireen Ghorbani, M.D.Walnut Creek, CA · $409 in drug and device payments (2025) ·
(925) 488-9006 Dr. Steve Cheng, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-5599 Dr. Steven Fredman, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Suyi Chang, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Theodore Levin, MDWalnut Creek, CA · $80 in drug and device payments (2025) ·
(925) 295-4000 Dr. Varujan Keledjian, M.D.Walnut Creek, CA · $30 in drug and device payments (2025) ·
(925) 296-7340 Dr. Victoria YungWalnut Creek, CA · $1,332 in drug and device payments (2025) · Telehealth ·
(925) 967-2978 Dr. Will Lane, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 932-6330 Dr. Ying Wang, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Yi Zheng, M.D.Walnut Creek, CA · $1,052 in drug and device payments (2025) · Telehealth ·
(925) 384-9276 Conditions Gastroenterology providers in Walnut Creek, California commonly treat
Patients often search by condition rather than specialty. These are conditions typically managed by Gastroenterology providers. Individual practices vary, so confirm with the provider before booking.
- Acid reflux
- IBS
- Crohn disease
- Ulcerative colitis
- Celiac disease
- Colon cancer screening
Common questions
How many Gastroenterology providers are in Walnut Creek, California?There are 33 Gastroenterology providers with active NPI records practicing in Walnut Creek, according to federal NPPES data refreshed monthly.
How many Gastroenterology providers in Walnut Creek received drug or device company payments?18 of 33 (55%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
What conditions do Gastroenterology providers in Walnut Creek treat?Gastroenterology providers in Walnut Creek commonly treat acid reflux, IBS, Crohn disease, ulcerative colitis, celiac disease and related conditions. Individual practices vary, so confirm with the provider before booking.
Where does this data come from?Provider records come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.
All specialties in Walnut Creek Gastroenterology across California
