Office Hours

Monday 9:00 am – 5:00 pm
Tuesday 9:00 am – 5:00 pm
Wednesday 9:00 am – 5:00 pm
Thursday 9:00 am – 5:00 pm
Friday 9:00 am – 4:00 pm
Saturday Closed
Sunday Closed

Call Us At

(281) 357 1977

Talk to our representative who can guide you through the care options that best fits your needs.


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Serving North Houston, Northwest Harris County, Cypress, Spring, Waller, Tomball, Magnolia and Surrounding Areas.

Houston City

Gastroenterology Diagnostic Center

421 School Street, Suite 110 Tomball, TX 77375

Phone: 281-357-1977

Conditions We Treat

Gastroenterology Diagnostic Center (GDC) offers comprehensive services to meet your gastrointestinal care needs and help you maintain a healthy lifestyle. We treat the following symptoms and diseases but are not limited to

Welcome to GDC

Gastroenterology Diagnostic Center

GDC is the premier gastroenterology practice with board-certified gastroenterologists in the Tomball and North Houston areas where we have been delivering state of the art care for over two decades. Our mission is to render the highest quality digestive health care to our patients in the most cost-effective way possible. While our practice employs the latest advances in gastroenterology procedures and uses every cutting-edge technology available, we still believe in building a compassionate and respectful relationship with each of our patients in the friendly manner of ‘old fashioned’ medical arts.

Our facility, located just a few blocks east of the Tomball Regional Hospital, has recently added a state-of-the-art office endoscopy suite. This latest addition provides a convenient and cost-effective alternative to hospital visits for patients undergoing certain procedures. GDC is pleased to be able to provide yet another enhancement to the comfort, well being, and privacy of our patients.

Our Physicians

Board Certified in Gastroenterology


Shabbir Jamali


Dr. Shabbir Jamali completed his Internal Medicine Residency at Wayne State University Medical Center in Detroit, Michigan. There he received the award for “Best Intern of the Year” for his performance. He then completed his Gastroenterology Fellowship at the University of Connecticut.

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Avais Chatha


Dr. Chatha began his clinical career as a Post-doctoral research fellow in pancreatic cancer research at Massachusetts General Hospital/ Harvard University, Boston. He completed his internship in General Surgery at New York Hospital Queens/Weill Cornell Medical College.

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Reynalin Bailey


Doctors Jamali and Chatha are supported in their practice by Advanced Practice Registered Nurse, Reynalin Bailey. After receiving her Master of Science in Nursing from Angelo State University, San Angelo, Texas, Ms. Bailey continued her schooling and received an APRN certification also from Angelo State.

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Patients' Reviews

5 Google Review Ratings

Take the first step to Gastro-intestinal Care

Call Gastroenterology Diagnostic Center in Tomball, TX 77375

(281) 357 1977


GDC (Gastroenterology Diagnostic Center) Tomball 77375