One Doctor.
Every Procedure.
Complete Care.
Board-certified specialist Dr. James Maher personally performs every colonoscopy and endoscopy. You finally found the doctor who will actually listen.
Board Certified
Gastroenterology & Internal Medicine
Fellowship Trained
Hepatology & GI Specialization
Personal Care
Dr. Maher performs 100% of procedures
Clinical Authority
Dual board certification and fellowship training at top-tier academic centers like Michigan and UC Irvine.
No Hand-offs
Unlike large clinics, Dr. Maher performs every procedure himself. No technicians, no fellows, no exceptions.
Patient Literacy
We believe in unhurried consultations where every result is explained in plain, actionable language.
Streamlined Care
Minimal wait times and same-week appointments often available for new patients in Katy.
Meet Dr. James Maher
Dr. James Maher earned his medical degree from Virginia Commonwealth University before completing advanced training at two of the nation's premier academic medical centers: the University of Michigan and the University of California-Irvine.
With decades of experience practicing in Katy, he has established a reputation for precision and empathy. He treats the person, not just the symptoms, ensuring you leave every appointment with absolute clarity about your health.
View Our Services
Clinical Services
Expert diagnosis and minimally invasive treatment.
Colonoscopy
The gold standard for colon cancer screening. Dr. Maher personally performs every colonoscopy and reviews your results the same day.
Upper GI Endoscopy
A thorough examination of the esophagus, stomach, and upper intestine to diagnose the source of persistent pain, reflux, or swallowing issues.
GERD & Acid Reflux
Chronic heartburn that won't go away deserves more than antacids. We identify the root cause and build a lasting treatment plan that works.
Fatty Liver Disease
Often silent until it progresses, fatty liver disease affects millions. We use advanced FibroScan technology to detect liver scarring early, before symptoms start.
Capsule Endoscopy
A tiny, swallowable camera captures thousands of images as it travels through your small intestine, helping us find problems a standard scope can't reach.
Hemorrhoids
You don't have to live with the discomfort. We offer effective, non-surgical treatments for hemorrhoids, including banding, so you can get back to normal.
Weight Loss
Sustainable weight management starts with understanding your digestive health. Dr. Maher creates personalized plans that address the GI factors behind stubborn weight gain.
Crohn's Disease
Crohn's requires ongoing, specialized care. We monitor your condition closely and adjust treatment to reduce flare-ups, manage symptoms, and protect your long-term health.
Ulcerative Colitis
This inflammatory condition affects the colon and can be unpredictable. We provide expert management focused on achieving and maintaining remission for a better quality of life.
Swallowing Disorders
Difficulty swallowing food or feeling like something is stuck can signal a treatable condition. We pinpoint the cause and develop a clear path to relief.
Pancreatic Disorders
From pancreatitis to pancreatic cysts, early detection and proper management are critical. We use advanced diagnostics to evaluate and treat complex pancreatic conditions.
Liver Health
Your liver plays a vital role in digestion and overall wellness. We screen for and manage chronic liver conditions, including hepatitis and cirrhosis.
The Maher Difference
In a world of medical hand-offs and automated results, we choose to do things differently. One doctor knows your history, one doctor performs your screening, and one doctor explains your results.
Personal responsibility in every procedure."Love the staff. Dr. Maher is very thorough and explains everything in detail. I would highly recommend this office."
— Elizabeth M."Dr. Maher is thorough, listens to my concerns, and prescribes only what I need. Excellent care every visit."
— Chris K."Have been seeing Dr. Maher since 2009. Always professional and always on time. The best gastroenterologist in the area."
— Gregory S.Our Katy Office
Location
Contact
Hours
Mon–Thu: 8:30 AM–5:00 PM
Fri: 8:30 AM–1:00 PM
We accept Medicare and most major insurance plans.
Take Control of Your Digestive Health
New patients are welcome. We offer same-week appointments for urgent concerns. Start your journey toward feeling better today.