Unio Specialty Care Gastroenterology Welcomes Dr. Robert Mecum!

Dr. Robert Mecum has joined Unio Specialty Care, California’s largest independent medical group providing gastroenterology, urology, and radiation oncology services. Your care team and office locations remain the same.  If you have questions about this transition, please call our office directly at (562) 789-5577.

Staying the Same

  • Your Care team
  • Our office locations
  • Our office phone number

Changing

  • Practice name on paperwork
  • Billing entity (Genesis Healthcare Partners, LLP)

Unio Specialty Care Gastroenterology Welcomes GI Specialists!

GI Specialists has joined Unio Specialty Care, California’s largest independent medical group providing gastroenterology, urology, and radiation oncology services.

Your physicians, office locations, and care team will remain the same.  If you have questions about this transition, please call your office directly.

What's staying the same?

  • Your doctors and care team
  • Your office locations
  • Office phone number

What's changing?

  • Practice Name on paperwork becomes Unio Specialty Care
  • Billing entity becomes Genesis Healthcare Partners, LLP
  • Athena patient portal access
  • New ways to pay bills online and with your phone
GI Specialists is now part of Unio Specialty Care

Unio Specialty Care – Gastroenterology – Hayward

Unio Specialty Care – Gastroenterology – Hayward

Office Hours

Monday

8:00 am - 5:00 pm

Tuesday

8:00 am - 5:00 pm

Wednesday

8:00 am - 5:00 pm

Thursday

8:00 am - 5:00 pm

Friday

8:00 am - 5:00 pm

Saturday

Closed

Sunday

Closed

Office Hours

Monday

8:00 am - 5:00 pm

Tuesday

8:00 am - 5:00 pm

Wednesday

8:00 am - 5:00 pm

Thursday

8:00 am - 5:00 pm

Friday

8:00 am - 5:00 pm

Saturday

Closed

Sunday

Closed

Choose a Provider Below to Schedule an Appointment

If you are an existing patient, please select your provider

Reviews

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


GI and liver conditions we treat in Hayward
Our Hayward gastroenterologists manage the complete range of digestive and liver problems — everyday concerns such as heartburn and irritable bowel syndrome, as well as more involved inflammatory conditions like Crohn's disease and ulcerative colitis. Preventive care, colonoscopy included, is part of routine practice here.
Welcoming new colon cancer screening patients
Screening is one of the most reliable ways to catch colon cancer early — or prevent it entirely — so our Hayward office stays open to new screening patients. Whether you're due for a first colonoscopy at 45, behind on one, or need ongoing monitoring because of prior results or family history, we'll help you get an appointment quickly.
What happens at your first appointment
Your initial visit is built around your health story. One of our physicians will review your background, talk through your symptoms, and answer your questions before laying out a plan — which might involve simple lifestyle steps, additional testing, or scheduling a procedure such as a colonoscopy or upper endoscopy.
A closer look at colonoscopy and its prep
Colonoscopy gives your physician a direct view of the colon's lining, making it possible to find polyps, inflammation, or early cancer well ahead of any symptoms. When your procedure is scheduled, we supply clear prep instructions and discuss sedation choices so you're at ease throughout. Learn more about colonoscopy screening.
Conditions We Treat at the Hayward GI Clinic
Our Hayward physicians diagnose and treat a wide variety of conditions, including:
  • 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
GI Services Offered at Our Hayward Office
From preventive screenings to advanced diagnostics, the Hayward office offers a complete range of gastrointestinal services: Each is provided with careful attention to accuracy, patient comfort, and the least invasive approach that fits the situation.

Frequently Asked Questions

Do I need a referral to see a gastroenterologist in Hayward?

It depends on your insurance plan. Some require a referral from your primary care physician before a GI appointment, while others let you schedule on your own. Our team reviews your coverage when you call and tells you what's required.

What conditions do your Hayward gastroenterologists treat?

Our Hayward physicians care for a wide span of digestive and liver concerns — from reflux, IBS, and hemorrhoids to inflammatory bowel disease, colon polyps, celiac disease, and liver or pancreatic conditions. If you're unsure whether we treat your particular issue, feel free to call and ask.

Do you accept my insurance at the Hayward office?

We work with most major insurance carriers, though what's covered depends on your specific plan. We'll verify your benefits and go over any anticipated costs ahead of your appointment.

What do I need to bring to my first appointment?

Bring your photo ID, insurance card, a current medication list, and any recent test results or imaging you have. There's no need to fast unless a procedure has already been arranged.

Are any tests performed at the first visit?

The first appointment is generally a consultation. If your physician recommends testing — such as lab work or an endoscopy — it's booked for a separate day, with instructions provided in advance.

Can I schedule a colon cancer screening in Hayward?

Yes. Our Hayward office provides complete colon cancer screening, including colonoscopy and any needed follow-up. Screening is typically recommended from age 45, and earlier for people with higher risk or a family history.

Ready to Make an Appointment?

We are the largest gastroenterology physician group in California. Our organization is committed to providing high-quality, patient-centered care in a private practice setting. Our physicians are experts in the diagnosis and treatment of diseases of the gastrointestinal system, including those of the esophagus, stomach, colon, liver, small intestine, gallbladder, pancreas, and biliary tract.

Make an appointment today to start your journey to better health!