Expert Gastroenterology Services in Hayward – Accepting New Patients
Hayward residents now have specialized gastrointestinal care right on the St. Rose Hospital campus. Our practice at 27206 Calaroga Avenue provides thorough diagnosis and treatment across the full spectrum of digestive and liver conditions, backed by a team of board-certified gastroenterologists — Wei Fang Ko, MD, Staya Allaparti, MD, Jeffrey Singerman, MD, and Vishal Ghevariya, MD. All four are accepting new patients and participate with most major insurance plans, making expert GI care easy to reach for families throughout Hayward, San Lorenzo, Union City, and the surrounding East Bay.
Digestive issues rarely resolve by being ignored, and small warning signs sometimes point to something worth addressing. Our physicians take time to listen, order the right tests, and recommend a course of care that makes sense for you — from ongoing management of a chronic condition to a colonoscopy that's simply due. Throughout, the emphasis stays on effective, minimally invasive treatment.
Care available at the Hayward office includes:
- 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
When your gut isn't working right, it affects far more than digestion. Our Hayward team focuses on catching problems early, screening on schedule, and using proven diagnostic tools so patients across the East Bay can get answers and lasting relief nearby.
Patients throughout the East Bay choose our Hayward office, including those from:
Hayward
San Lorenzo
Castro Valley
Union City
San Leandro
Fremont
Newark
Cherryland
Ashland
Fairview
Dublin
Pleasanton
- 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 Hayward
- Flexible sigmoidoscopy in Hayward
- Upper endoscopy (EGD) in Hayward
- Capsule endoscopy in Hayward
- Liver function testing
- Hemorrhoid Banding Therapy in Hayward
- SIBO hydrogen breath testing
- Polyp removal and biopsy
- Nutrition counseling for GI conditions


























