Expert Gastroenterology Services in Castro Valley – Accepting New Patients
Castro Valley residents now have a local option for specialized digestive care. Located on Lake Chabot Road beside the Sutter Eden Medical Center campus, our gastroenterology office serves patients who need expert evaluation and treatment for the full range of GI concerns. Our board-certified gastroenterologists — Wei Fang Ko, MD, Staya Allaparti, MD, Jeffrey Singerman, MD, and Vishal Ghevariya, MD — are accepting new patients and work with most major insurance plans. The location puts high-quality digestive care within easy reach of Hayward, San Leandro, San Lorenzo, and the wider East Bay.
It's tempting to wait out digestive trouble and hope it fades, but symptoms that stick around usually deserve a closer look. Our team works to pinpoint what's really going on, explain it in plain terms, and map out a treatment plan you're comfortable with — whether that means managing a chronic condition or arranging a colonoscopy you may be overdue for. Care stays as conservative and minimally invasive as your situation allows.
The Castro Valley office provides services that include:
- Colonoscopy and colon cancer screening
- Upper endoscopy (EGD)
- Evaluation and management of GERD, IBS, IBD (Crohn's & ulcerative colitis)
- Liver and pancreatic disease care
- Hemorrhoid treatment
- Abdominal pain and bloating diagnostics
Digestive discomfort has a way of touching nearly every part of daily life. With an emphasis on prevention, timely screening, and today's diagnostic technology, our Castro Valley practice helps East Bay patients get clear answers and effective care without a long trip.
Our Castro Valley office cares for patients from across the East Bay, including:
Castro Valley
Hayward
San Leandro
San Lorenzo
Oakland
Dublin
Pleasanton
Fremont
Union City
Fairview
Cherryland
Ashland
- Acid reflux (GERD)
- Irritable Bowel Syndrome (IBS)
- Crohn's disease and ulcerative colitis
- Constipation and diarrhea
- Colon polyps and colorectal cancer
- Celiac disease
- Liver disease and hepatitis
- Barrett's esophagus
- Gallbladder and pancreatic disorders
- Hemorrhoids
- Colonoscopy in Castro Valley
- Flexible sigmoidoscopy in Castro Valley
- Upper endoscopy (EGD) in Castro Valley
- Capsule endoscopy in Castro Valley
- Liver function testing
- Hemorrhoid Banding Therapy in Castro Valley
- SIBO hydrogen breath testing
- Polyp removal and biopsy
- Nutrition counseling for GI conditions


























