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Gastroenterologist in Katy, TX
Board-Certified Gastroenterologist in Katy, TX for Complete Digestive & Liver Care
United Gastroenterology Associates, PLLC provides digestive and liver care in Katy, TX at 23920 Katy Freeway, Suite 555. Care is led by Dr. Muhammad Ali Khan, MD, FACP, FASGE, a board-certified gastroenterologist and hepatologist and former Associate Professor at MD Anderson Cancer Center. The Katy office evaluates heartburn, abdominal pain, bowel changes, and liver concerns and performs colonoscopy and upper endoscopy. New patients are welcome, and most major insurance plans are accepted.
United Gastroenterology Associates – Katy
23920 Katy Freeway, Suite 555, Katy, TX 77494
Who Is a Board-Certified Gastroenterologist in Katy, TX?
Dr. Muhammad Ali Khan, MD, FACP, FASGE, is a board-certified gastroenterologist and hepatologist who sees patients at the United Gastroenterology Associates office at 23920 Katy Freeway, Suite 555, Katy, TX 77494. He diagnoses and treats conditions of the esophagus, stomach, intestines, colon, liver, gallbladder, and pancreas, and performs colonoscopy and upper endoscopy (EGD). Appointments are available Monday through Friday; call (346) 340-4414 or request an appointment online.
At United Gastroenterology Associates, we are committed to delivering trusted digestive care for the whole family through compassionate, patient-centered treatment and advanced medical expertise. Led by Dr. Muhammad Ali Khan, MD, FACP, FASGE, our board-certified gastroenterologist combines years of clinical experience with the latest diagnostic technology to provide accurate diagnoses, personalized treatment plans, and long-term digestive health solutions. Whether you need preventive care, evaluation of persistent digestive symptoms, or specialized treatment for complex gastrointestinal or liver conditions, our team is dedicated to helping you feel better and live healthier. As a leading gastroenterology practice serving Katy, Cypress, and the Greater Houston area, we offer advanced GI procedures, including colonoscopy, upper endoscopy (EGD), capsule endoscopy, FibroScan®, ERCP, and comprehensive digestive evaluations—all under one roof.
We proudly accept most major insurance plans and provide high-quality, evidence-based care for patients experiencing abdominal pain, acid reflux (GERD), IBS, constipation, diarrhea, bloating, blood in the stool, hemorrhoids, difficulty swallowing, liver disease, fatty liver disease, pancreatitis, gallbladder disorders, and other digestive conditions. Our goal is simple: to identify the root cause of your symptoms, provide effective treatment, and support your long-term digestive wellness.
Get directions to the Katy office · Request an appointment online
Board-Certified Gastroenterologist
Advanced expertise in digestive and liver diseases.
Advanced GI Procedures
Comprehensive diagnostics and treatment under one roof.
Most Major Insurance Plans Accepted
Quality digestive care that's accessible and affordable.
Trusted Digestive Care for the Whole Family
Compassionate, personalized care for every stage of life.
“My gastroenterology & hepatology practice is dedicated to working closely with you to develop a personalized treatment plan that meets your unique needs and preferences.”
Dr. Muhammad Ali Khan, MD, FACP, FASGE
Board-certified gastroenterologist and hepatologist, United Gastroenterology Associates
Meet Dr. Muhammad Ali Khan, Gastroenterologist in Katy
At the heart of our practice is Dr. Muhammad Ali Khan, a highly respected, board-certified gastroenterologist and hepatologist with extensive experience in diagnosing and treating diseases of the digestive system and liver.
Dr. Khan earned his medical degree from Dow Medical College, completed his Internal Medicine residency at the University of Toledo, and went on to complete advanced fellowship training in Gastroenterology and Hepatology at the University of Tennessee.
Throughout his distinguished career, Dr. Khan has combined outstanding clinical care with academic excellence. He previously served as an Associate Professor at MD Anderson Cancer Center, where he participated in the care of patients with complex gastrointestinal conditions and gastrointestinal cancers while contributing to medical education and research.
Dr. Khan has authored more than 100 peer-reviewed scientific publications and has presented research at national and international medical conferences. According to the practice, his work has contributed to clinical practice guidelines in gastroenterology.
As a Fellow of both the American College of Physicians (FACP) and the American Society for Gastrointestinal Endoscopy (FASGE), Dr. Khan remains committed to delivering evidence-based, patient-focused care using the latest advancements in digestive medicine.
He is an active member of several professional organizations, including the American College of Gastroenterology and the Texas Medical Association. Read Dr. Khan’s full profile.
Professional Memberships
- American College of Gastroenterology
- American Society for Gastrointestinal Endoscopy (Fellow)
- American Gastroenterological Association
- American College of Physicians (Fellow)
- Texas Medical Association
- Texas Society of Gastroenterology & Endoscopy
Areas of Care
- Acid reflux, GERD, and gastritis
- Abdominal pain, bloating, and bowel changes
- IBS and inflammatory bowel disease
- Fatty liver and other liver conditions
- Colonoscopy and colorectal cancer screening
- Upper endoscopy (EGD)
Why Choose United Gastroenterology in Katy?
Choosing the right gastroenterologist is one of the most important decisions you can make for your digestive health. Digestive symptoms often have multiple possible causes, and successful treatment begins with an accurate diagnosis and a physician who takes the time to understand your medical history, symptoms, lifestyle, and long-term health goals.
If you're searching for an experienced gastroenterologist in Katy, TX, you deserve more than symptom relief—you deserve an accurate diagnosis, personalized treatment, and a long-term partner in your digestive health. At United Gastroenterology, we focus on treating the whole patient—not just the condition. We believe every patient deserves clear communication, timely appointments, thorough evaluations, and treatment recommendations based on the latest medical research.
Rather than treating symptoms alone, we work to identify the underlying cause of digestive problems so patients receive the most effective treatment possible.
Board-certified in gastroenterology and hepatology
Comprehensive care for digestive and liver diseases, with expertise in GERD, IBS, IBD, liver disease, hemorrhoids, constipation, diarrhea, and abdominal pain.
Colonoscopy and endoscopy in one practice
Advanced diagnostic procedures performed with modern technology, scheduled through the same practice that evaluates your symptoms.
Personalized treatment plans
Treatment plans based on current medical guidelines and on each patient’s history, symptoms, and goals.
Colon cancer screening and prevention
Screening colonoscopy and follow-up for patients due for colorectal cancer screening or with a history of polyps.
Convenient Katy location
On Katy Freeway with easy access from Interstate 10 and the Grand Parkway (Highway 99).
Insurance and self-pay options
Most major insurance plans are accepted, and affordable self-pay options are available for eligible patients.
Comprehensive Diagnosis & Treatment in Katy for Digestive and Liver Conditions
At United Gastroenterology Associates, we provide comprehensive evaluation and treatment for a wide range of digestive and liver conditions affecting the esophagus, stomach, intestines, colon, rectum, liver, pancreas, and gallbladder. Our board-certified gastroenterologist specializes in diagnosing and managing Irritable Bowel Syndrome (IBS), Inflammatory Bowel Disease (Crohn's disease and Ulcerative Colitis), GERD, chronic abdominal pain, constipation, diarrhea, bloating, excessive gas, hemorrhoids, rectal bleeding, blood in the stool, liver disease, fatty liver disease, pancreatitis, and gallbladder disorders. Using advanced diagnostic testing, including colonoscopy, endoscopy, FibroScan®, laboratory studies, and imaging, we identify the underlying cause of your symptoms and develop personalized treatment plans designed for long-term digestive health.
Whether you are experiencing persistent stomach pain, frequent heartburn, changes in bowel habits, rectal bleeding, unexplained weight loss, or chronic digestive discomfort, our experienced gastroenterology team is committed to providing accurate diagnosis, evidence-based treatment, and compassionate care. From preventive colon cancer screening and hemorrhoid evaluation to advanced liver care and pancreatic disease management, we offer comprehensive digestive healthcare under one roof, helping patients throughout Katy, Cypress, and the Greater Houston area achieve lasting relief and improved quality of life.
GERD and Acid Reflux
Frequent heartburn, regurgitation, a sour taste, or chronic cough can indicate gastroesophageal reflux disease. Persistent reflux may be evaluated with an upper endoscopy.
Crohn’s Disease and Ulcerative Colitis
Inflammatory bowel disease causes chronic inflammation of the digestive tract and needs ongoing specialist management and monitoring.
Rectal Bleeding and Blood in Stool
Blood in the stool should always be evaluated by a physician. A colonoscopy is often used to find the source.
Hemorrhoids
Hemorrhoids can cause itching, pain, swelling, or bleeding. Because bleeding has other possible causes, persistent symptoms deserve an evaluation.
Dr. Khan also evaluates abdominal pain, irritable bowel syndrome (IBS), constipation, chronic diarrhea, difficulty swallowing, fatty liver disease, pancreatic disorders, and gallbladder and biliary disorders.
Having Persistent Digestive Symptoms?
Symptoms that last for weeks or keep returning deserve a specialist evaluation. Dr. Khan sees patients at the Katy office on Katy Freeway, and new patients are welcome.
Digestive Symptoms You Should Never Ignore
Many digestive disorders begin with mild or intermittent symptoms that patients assume will improve on their own. While occasional digestive discomfort is common, persistent or recurring symptoms should never be ignored. Early diagnosis can often prevent complications, improve treatment outcomes, and provide peace of mind.
These symptoms may be associated with conditions such as GERD, gastritis, peptic ulcers, irritable bowel syndrome, inflammatory bowel disease, hemorrhoids, colon polyps, colorectal cancer, gallbladder disease, pancreatitis, fatty liver disease, or other gastrointestinal disorders.
Rather than relying on over-the-counter medications to temporarily relieve symptoms, our goal is to determine why those symptoms are occurring and develop a treatment plan that addresses the underlying condition.
When to seek emergency care
Call 911 or go to the nearest emergency room for severe abdominal pain, vomiting blood, black or tarry stools with dizziness or fainting, heavy rectal bleeding, or chest pain.
Schedule an appointment with our Katy gastroenterology team if you experience:
- Persistent abdominal pain or stomach discomfort
- Frequent heartburn or acid reflux
- Difficulty swallowing
- Bloating or excessive gas
- Chronic constipation
- Ongoing diarrhea
- Blood in your stool or rectal bleeding
- Black or tarry stools
- Nausea or vomiting
- Unexplained weight loss
- Loss of appetite
- Fatigue associated with digestive symptoms
- Changes in bowel habits lasting more than two weeks
Symptoms should be evaluated by a qualified medical professional.
GERD & Acid Reflux Treatment in Katy
Heartburn is common, but frequent acid reflux is not normal. If you experience heartburn more than twice a week, wake up coughing at night, have difficulty swallowing, or rely on antacids every day, you may have Gastroesophageal Reflux Disease (GERD).
At United Gastroenterology, we perform comprehensive evaluations using upper endoscopy and other diagnostic tools to determine the cause of reflux symptoms. Treatment may include lifestyle modifications, dietary counseling, medication management, and advanced endoscopic therapies when appropriate.
Common GERD Symptoms
- Burning sensation in the chest
- Acid coming into the throat
- Chronic cough
- Hoarseness
- Sore throat
- Difficulty swallowing
- Chest discomfort
- Bad breath
- Excessive burping
Why Chronic GERD Should Be Treated
Without treatment, chronic GERD can lead to:- Esophagitis
- Barrett's Esophagus
- Esophageal ulcers
- Esophageal strictures
- Increased risk of esophageal cancer
Acid reflux treatment · Upper endoscopy (EGD)
Call (346) 340-4414Patients looking for acid reflux treatment or a heartburn specialist in Katy can be evaluated at the Katy office for long-term relief.
Gastritis and Stomach Inflammation Care in Katy
Gastritis is inflammation of the stomach lining and one specific type of gut inflammation. Common causes include H. pylori infection, regular NSAID pain reliever use and alcohol, and symptoms such as upper stomach burning, nausea or early fullness overlap with acid reflux and ulcers. At the Katy office, Dr. Khan reviews your symptoms and medications, may test for H. pylori, and recommends an upper endoscopy (EGD) when symptoms are persistent, severe or come with warning signs. Treatment is directed at the cause.
Gastritis and stomach inflammation: evaluation and treatment · Learn More About Gut Inflammation · Upper endoscopy in Katy
Advanced Gastroenterology Procedures in Katy, TX
At United Gastroenterology Associates, we believe that accurate diagnosis is the foundation of successful treatment. Many digestive diseases cannot be diagnosed through symptoms alone. Advanced procedures allow us to examine the digestive tract directly, identify abnormalities at an early stage, and develop personalized treatment plans before conditions become more serious.
Our Katy gastroenterology clinic is equipped with modern diagnostic technology that helps evaluate disorders involving the esophagus, stomach, small intestine, colon, liver, pancreas, and biliary system. Every procedure is performed with patient comfort, safety, and accuracy as our highest priorities.
Whether you need a routine preventive screening or evaluation of persistent digestive symptoms, our experienced gastroenterology team provides compassionate care using evidence-based medical practices.
Colonoscopy
What it is: An examination of the colon and rectum with a thin, flexible camera. Precancerous polyps can often be removed during the same procedure.
Why it may be recommended: Colorectal cancer screening and evaluation of rectal bleeding, blood in the stool, bowel changes, anemia, or unexplained weight loss.
Colonoscopy in Katy, TX · Colonoscopy prep
Schedule a Colonoscopy ConsultationUpper Endoscopy (EGD)
What it is: An examination of the esophagus, stomach, and duodenum with a thin, flexible camera.
Why it may be recommended: Persistent heartburn or reflux, difficulty swallowing, upper abdominal pain, nausea, or suspected gastritis or ulcers.
Endoscopy in Katy, TX · Upper endoscopy (EGD)
Ask About Upper EndoscopyAt United Gastroenterology Associates, we provide advanced diagnostic and therapeutic procedures to accurately diagnose, treat, and prevent a wide range of digestive and liver conditions. Our board-certified gastroenterologist performs colonoscopy, upper endoscopy (EGD), capsule endoscopy, FibroScan®, ERCP, flexible sigmoidoscopy, esophageal dilation, anorectal manometry, and esophageal pH monitoring using modern technology and evidence-based techniques. Colonoscopy remains the gold standard for colorectal cancer screening, allowing early detection and removal of precancerous polyps before they become cancerous. We also evaluate patients experiencing abdominal pain, rectal bleeding, blood in the stool, chronic constipation, diarrhea, unexplained weight loss, anemia, acid reflux, difficulty swallowing, and other persistent digestive symptoms. Our goal is to identify the underlying cause of your condition through accurate diagnosis while providing safe, comfortable, outpatient procedures.
Conveniently Located Gastroenterology Clinic in Katy, TX
Our Katy office is conveniently located at 23920 Katy Freeway, Suite 555, Katy, TX 77494, providing easy access for patients throughout Katy and West Houston. Situated just off Interstate 10 (Katy Freeway) near the Grand Parkway (Highway 99), our clinic is easily accessible from surrounding communities including Cinco Ranch, Fulshear, Cross Creek Ranch, Firethorne, Elyson, Cane Island, Jordan Ranch, Brookshire, Falcon Point, Grand Lakes, Green Trails, Memorial Parkway, Nottingham Country, Richmond, and West Houston.
Whether you're traveling via I-10, Highway 99 (Grand Parkway), FM 1463, Mason Road, Pin Oak Road, Fry Road, or Westheimer Parkway, you'll find our office conveniently located with ample parking and a patient-friendly environment. We are committed to making your visit as convenient and comfortable as possible, from scheduling your appointment to completing your consultation, colonoscopy, endoscopy, or follow-up care. If you need assistance finding our office or have questions before your visit, our friendly team is happy to help. Call (346) 340-4414 to schedule your appointment or receive directions to our Katy location.
United Gastroenterology Associates – Katy Office
Katy office – Katy Freeway (I-10) near the Grand Parkway
- Address: 23920 Katy Freeway, Suite 555, Katy, TX 77494
- Phone: (346) 340-4414
- Hours: Monday–Friday, 8:30 AM–5:00 PM (closed 12:00–1:30 PM for lunch; last appointment 4:30 PM)
Looking for the Cypress office? See our Cypress gastroenterologist page or view both locations.
Insurance and Self-Pay Options
United Gastroenterology Associates accepts most major insurance plans, including the carriers shown here. Benefits and network participation vary by plan and can change, so the office verifies your coverage before your visit. Patients without insurance can ask about self-pay options for consultations, colonoscopy, and upper endoscopy.
A carrier logo does not guarantee coverage for a specific plan or service. Call (346) 340-4414 to confirm your benefits.
Patient Reviews
These reviews were shared by patients of United Gastroenterology Associates and are published on the practice website. Our greatest compliment is the trust our patients place in us by referring their friends and family members for digestive care.
“Dr. Khan is an exceptionally kind and compassionate physician. He truly listens to his patients and takes the time to explain everything clearly and thoroughly. His treatment plans are straightforward and easy to understand, and he provides a very personalized, attentive level of care. I felt respected, heard, and genuinely cared for throughout my visit.”
Maria Andreina Behrens · Katy
“Dr Kahn and his staff are AWESOME. He is thorough, kind, listens and puts you at ease. The staff are patient and very helpful. I was so afraid of having a colonscopy. Dr Kahn was wonderful. My procedure went so well. It was over and done with in what seemed like a minute! So expect that! Dr Kahn is excellent, I trust him completely. And I recommend him, and his staff.”
Steph Apie · Fulshear
“My experience with United Gastroenterology Associates was outstanding. Scheduling was easy, and the wait time was minimal. The doctors and nurses were incredibly professional and made sure I was comfortable during my colonoscopy. I appreciate their dedication to patient care and highly recommend their services!”
William
How to Schedule an Appointment in Katy
Scheduling with United Gastroenterology Associates takes three steps. Request an appointment online or by phone, and the office will confirm your visit and insurance details.
Request an appointment
Call (346) 340-4414 or use the online request form, and choose Katy as your preferred office.
The office confirms your visit
Staff confirm your appointment time and verify your insurance coverage or explain self-pay options before your visit.
Meet your GI specialist
Dr. Khan reviews your symptoms and history and recommends next steps, which may include testing or a procedure.
Frequently Asked Questions About Seeing a Gastroenterologist in Katy
Answers to common questions from patients about the United Gastroenterology Associates Katy office.
Where is the gastroenterologist office in Katy, TX?
The United Gastroenterology Associates Katy office is at 23920 Katy Freeway, Suite 555, Katy, TX 77494, on the Katy Freeway (I-10) near the Grand Parkway (Highway 99).
Who is the gastroenterologist at the Katy office?
Dr. Muhammad Ali Khan, MD, FACP, FASGE, a board-certified gastroenterologist and hepatologist and former Associate Professor at MD Anderson Cancer Center, sees patients at the Katy office.
What are the Katy office hours?
The office is open Monday through Friday from 8:30 AM to 5:00 PM and closes for lunch from 12:00 to 1:30 PM. The last appointment each day is at 4:30 PM.
What conditions does the Katy gastroenterologist treat?
Common reasons for a visit include acid reflux and GERD, gastritis, abdominal pain, IBS, Crohn’s disease and ulcerative colitis, constipation, diarrhea, rectal bleeding, hemorrhoids, fatty liver, and other liver, pancreas, and gallbladder conditions.
Can I get a colonoscopy in Katy?
Yes. Dr. Khan performs screening and diagnostic colonoscopy for Katy-area patients. The office provides preparation instructions and explains what to expect before the procedure.
When should I start colon cancer screening?
The U.S. Preventive Services Task Force recommends colorectal cancer screening for average-risk adults ages 45 to 75. People with a family history or other risk factors may need to start earlier, so ask your doctor.
Does the Katy office accept insurance?
Yes. United Gastroenterology Associates accepts most major insurance plans, including Aetna, Blue Cross Blue Shield, Cigna, Humana, Medicare, Tricare Prime, and UnitedHealthcare. Coverage depends on your specific plan, so the office verifies benefits before your visit. Call (346) 340-4414 to confirm your plan.
Are self-pay appointments available?
Yes. Patients without insurance can ask about self-pay options for consultations and procedures. Call the office for current self-pay information.
Do I need a referral to see a gastroenterologist in Katy?
Some insurance plans require a referral from a primary care physician. The office can help you check whether your plan requires one when you schedule.
How do I schedule an appointment in Katy?
Call (346) 340-4414 or submit the online appointment request form and select the Katy office. New patients are welcome.
Schedule Your Appointment Today
Digestive symptoms should never be ignored. Whether you have persistent heartburn, abdominal pain, bloating, constipation, diarrhea, blood in your stool, liver concerns, or simply need a preventive screening colonoscopy, early evaluation can make a significant difference in your health. Call (346) 340-4414 or request an appointment online at the Katy office, 23920 Katy Freeway, Suite 555.
Sources
- U.S. Preventive Services Task Force. Colorectal Cancer: Screening. Final recommendation statement, May 18, 2021. uspreventiveservicestaskforce.org
- National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Gastritis and Gastropathy. niddk.nih.gov
- Centers for Disease Control and Prevention. Screening for Colorectal Cancer. cdc.gov
This page provides general educational information and does not replace medical advice, diagnosis, or treatment. Symptoms should be evaluated by a qualified medical professional. For a medical emergency, call 911. Content reviewed by United Gastroenterology Associates, PLLC. Last updated September 24, 2026.