Accepting new patients at Cypress & Katy. Most insurance accepted.
Former MD Anderson faculty · FACP, FASGE · 100+ published articles
Katy Gastroenterology at a Glance
Digestive & Liver Specialist for Katy, Fulshear, and Cinco Ranch
Dr. Muhammad Ali Khan is a board-certified gastroenterologist with 18 years of clinical experience, serving patients in Katy and Cypress, TX. He provides comprehensive care for digestive and liver conditions, with expertise in colonoscopy, endoscopy, and colorectal cancer screening.
Dr. Khan’s expertise encompasses the evaluation and management of acid reflux and GERD, irritable bowel syndrome (IBS), Crohn’s disease, ulcerative colitis, abdominal pain, rectal bleeding, and fatty liver disease. His approach emphasizes careful evaluation, clear communication, and personalized treatment plans tailored to each patient’s symptoms, medical history, and digestive health needs. Our Katy clinic is located on Katy Freeway (I-10) in Memorial Hermann Medical Plaza 1, and our Cypress clinic is located on Northwest Freeway (US-290).
Medically reviewed by Muhammad Ali Khan, MD · Updated October 2026
Home › Gastroenterologist in Katy, TX
Katy Office · Next to Memorial Hermann Katy Hospital
Your Gastroenterologist Next to Memorial Hermann Katy Hospital
Dr. Muhammad Ali Khan, MD, FACP, FASGE, treats adults with acid reflux, IBS, abdominal pain, liver disease and colorectal cancer screening needs at our Katy office.
Heartburn that keeps coming back, belly pain, bloating or a change in bowel habits deserves a clear explanation, not guesswork. At our Katy office, Dr. Khan takes a full history, reviews your prior labs, imaging and scope reports, and explains what is most likely going on and what to do next.
Many patients come to us for a second opinion, for screening they have put off, or because symptoms have not improved with over-the-counter treatment. Our goal is for you to leave your first visit with a clear plan.
United Gastroenterology Associates – Katy
Digestive & Liver Care
Evaluation and long-term care for reflux, IBS, IBD and liver disease.
Colonoscopy & Upper Endoscopy
Screening and diagnostic procedures, with clear prep instructions before your date.
Katy Appointments
New patients welcome. Request online or call (346) 340-4414.
Insurance & Self-Pay
Most major plans accepted, including Medicare, plus self-pay estimates.
“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
Gastroenterologist and hepatologist, United Gastroenterology Associates
Meet Dr. Muhammad Ali Khan, Your Katy Gastroenterologist
Dr. Muhammad Ali Khan, MD, FACP, FASGE, is a board-certified gastroenterologist and hepatologist who sees patients at United Gastroenterology Associates in Katy and Cypress. He treats the full range of digestive and liver conditions, from reflux and IBS to inflammatory bowel disease, fatty liver disease and colorectal cancer prevention.
He earned his medical degree at Dow Medical College, completed his internal medicine residency at the University of Toledo, and trained in gastroenterology and hepatology at the University of Tennessee Health Science Center.
Before joining United Gastroenterology Associates, Dr. Khan held faculty appointments at the University of Alabama at Birmingham and The University of Texas MD Anderson Cancer Center, and he has authored more than 100 peer-reviewed articles.
Languages: English, Hindi, and Urdu.
Hospital affiliations: Memorial Hermann Katy Hospital and Memorial Hermann Cypress Hospital.
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)
Patient Reviews · Katy Office
What Katy Patients Say About Dr. Khan
“I had a great experience with Dr. Khan when I brought my dad in for a colonoscopy. The procedure was quick, smooth, and easier than we expected. Dr. Khan and the team did a great job and made the whole process comfortable and stress-free.”
“I’m very grateful for the excellent care I received from Dr. Muhammad Ali Khan. He was kind, caring, and professional, and took the time to explain everything clearly. He made me feel comfortable and gave me peace of mind.”
“Dr. Khan has been an amazing doctor. He was very helpful, caring, and professional throughout my experience. I would definitely recommend him to my family and friends. The entire staff was also very helpful and welcoming.”
What to Expect at Your GI Visit in Katy
We listen first
At United Gastroenterology Associates in Katy, your visit starts with your story: what changed, when symptoms happen, what makes them better or worse and what you have already tried. Bring prior test results if you have them.
Testing only when it helps
If a test is recommended, Dr. Khan explains why, what it can show and whether there are alternatives. Not every patient needs a colonoscopy or endoscopy.
A clear treatment plan
You will know the likely diagnosis, your treatment plan, how results will be shared and when to follow up. Tell us about all medicines you take and other doctors involved in your care.
Simple scheduling
Our team helps you confirm your insurance, any referral your plan requires and the preparation instructions for your visit.
Visit Our Katy Office on I-10
United Gastroenterology Associates — Katy
Katy Freeway (I-10) near the Grand Parkway
Phone: (346) 340-4414
Office hours: Monday–Friday, 8:30 AM–5:00 PM
Closed for lunch: 12:00–1:30 PM
Last appointment: 4:30 PM
Patients visit us from Cinco Ranch, Cross Creek Ranch, Fulshear, Firethorne, Elyson, Grand Lakes and the Energy Corridor. The office sits on the Katy Freeway (I-10) near the Grand Parkway. If you are scheduled for a procedure, your instructions will list the facility address.
Request a Katy Appointment · Get Directions
Digestive and Liver Conditions We Treat in Katy
Digestive symptoms often overlap, so at our Katy office Dr. Khan looks at your symptoms, history and prior results together to find the cause and recommend only the tests you need.
GERD and Acid Reflux
Heartburn more than twice a week, regurgitation, a sour taste or a nighttime cough can all point to GERD. Treatment ranges from diet and medicine changes to upper endoscopy when symptoms persist or warning signs appear.
Crohn’s Disease and Ulcerative Colitis
Crohn's disease and ulcerative colitis need ongoing specialist care. Dr. Khan manages flares, monitors inflammation and adjusts medicines with the goal of long-term remission.
Rectal Bleeding and Blood in Stool
Blood in the stool should always be checked; do not assume it is hemorrhoids. Go to the ER for heavy bleeding, vomiting blood or bleeding with fainting. [1]
Hemorrhoids
Itching, swelling, pain or bright red blood can come from hemorrhoids, but other conditions cause similar symptoms. An exam confirms the cause and guides treatment.
Bloating and Gas
Bloating that keeps coming back may be linked to constipation, food intolerance, IBS or SIBO. Noting when it happens and what you ate helps pinpoint the cause.
Abdominal Pain
Where the pain is, when it started and what it feels like all help narrow the cause. Sudden or severe abdominal pain needs emergency care, not a routine appointment.
Dr. Khan also treats irritable bowel syndrome, constipation, chronic diarrhea, swallowing problems, fatty liver disease, and other liver, pancreatic and bile duct conditions.
Irritable Bowel Syndrome Care
Ready to Feel Better? Book Your Katy GI Visit
Request an appointment at our Katy office for ongoing symptoms, a second opinion or colorectal cancer screening. New patients are welcome.
When to Go to the ER Instead
Do not wait for an appointment
Call 911 or go to the nearest emergency room for severe abdominal pain, chest pain, vomiting blood, heavy rectal bleeding, or bleeding with fainting or dizziness.
Black or tarry stools can signal bleeding in the upper digestive tract and need same-day medical care. [1]
Our online appointment form is not an emergency service.
For ongoing, non-emergency symptoms
Call the office about heartburn that keeps returning, bloating, constipation, diarrhea or digestive discomfort that is not improving. You do not need to wait weeks before asking for help.Acid Reflux and Gastritis Care in Katy
When heartburn keeps coming back
Persistent reflux, nighttime heartburn or symptoms that continue on medication deserve a closer look. Dr. Khan reviews your history, adjusts treatment and recommends upper endoscopy when trouble swallowing, weight loss or long-standing symptoms are present.Explore GERD Evaluation and Treatment
Gastritis and upper stomach pain
Gastritis is inflammation of the stomach lining. It can cause upper belly pain, nausea or feeling full quickly. Common causes include H. pylori infection and pain relievers such as NSAIDs, and treatment targets the cause. [5]Colonoscopy and Upper Endoscopy in Katy
When symptoms alone do not give the full picture, a scope lets Dr. Khan see the digestive tract directly, take biopsies and often treat the problem during the same procedure.
Colonoscopy
Colonoscopy uses a thin, flexible camera to examine the colon and rectum. It screens for colorectal cancer, removes polyps before they can turn into cancer and investigates bleeding or bowel changes. Adults at average risk should begin screening at 45. [3]
Colonoscopy in Katy · Colonoscopy Preparation Instructions
Request a Colonoscopy ConsultationUpper Endoscopy — EGD
Upper endoscopy (EGD) examines the esophagus, stomach and duodenum. It helps diagnose trouble swallowing, ongoing reflux, ulcers, bleeding and H. pylori-related inflammation, with biopsies taken when needed. [4]
Ask About Upper EndoscopyWhere your procedure takes place. Consultations happen at the Katy office, and procedures may be scheduled at an affiliated facility. Our scheduling team gives you the facility address, arrival time and prep instructions in advance.
Ask whether a FibroScan liver assessment or capsule endoscopy fits your care.
Directions and Parking at the Katy Office
The office sits next to Memorial Hermann Katy Hospital, near I-10 and the Grand Parkway.
We see patients from Katy, Cinco Ranch, Fulshear, Cross Creek Ranch, Firethorne, Cane Island and west Houston.
Surface-lot parking is available at the building. Call (346) 340-4414 if you need help finding Suite 555 or need accessibility assistance.
Procedure instructions list their own facility address, so check them before you travel.
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)
Closer to US-290? Visit our Cypress gastroenterology office.
Insurance and Self-Pay Options
United Gastroenterology Associates accepts most major insurance plans, including Blue Cross Blue Shield, Aetna, Cigna, UnitedHealthcare, Humana, Medicare and TRICARE Prime. Coverage varies by plan, so call (346) 340-4414 with your plan details and our team will help verify your benefits.
Ask about referral or prior-authorization requirements before your visit. Self-pay patients can request estimates for consultations, colonoscopy and endoscopy.
For procedures, ask what the estimate includes, since facility, pathology or anesthesia charges may be billed separately.
Questions About Our Katy Gastroenterology Office
Where is the Katy gastroenterology office?
Next to Memorial Hermann Katy Hospital on the Katy Freeway (I-10), near the Grand Parkway. Use our Katy directions link for the fastest route.
Who is the gastroenterologist at the Katy office?
Dr. Muhammad Ali Khan, MD, FACP, FASGE, a gastroenterologist and hepatologist, sees patients at the Katy office. Read his physician profile for his training and experience.
What are the office hours?
Monday–Friday, 8:30 AM–5:00 PM, closed for lunch from 12:00 to 1:30 PM. The last appointment of the day is at 4:30 PM.
What conditions does the Katy office treat?
Acid reflux and GERD, gastritis, IBS, Crohn's disease, ulcerative colitis, abdominal pain, bloating, constipation, diarrhea, rectal bleeding, fatty liver disease and other liver conditions, plus colorectal cancer screening.
Do you see patients from Cinco Ranch and Fulshear?
Yes. Many patients come from Cinco Ranch, Fulshear, Cross Creek Ranch and Firethorne. The office is on I-10 in Katy, a short drive from these communities.
Do I need a referral?
Many plans let you book directly with a specialist, while some HMO plans require a referral from your primary care doctor. Our team can help you check your plan's rules.
Does the practice accept my insurance?
We accept most major plans, including Blue Cross Blue Shield, Aetna, Cigna, UnitedHealthcare, Humana, Medicare and TRICARE Prime. Call with your exact plan so we can verify your coverage.
Can I ask about self-pay care?
Yes. Ask about self-pay consultation and procedure pricing and what each estimate includes before you book.
Can I arrange a colonoscopy through the practice?
Yes. Request a consultation for screening or symptoms. If colonoscopy is recommended, our team schedules the procedure and sends your prep instructions.
When should colorectal cancer screening begin?
The U.S. Preventive Services Task Force recommends screening for adults at average risk from age 45 through 75, with screening from 76 to 85 decided case by case. A family history of colon cancer or polyps may mean starting earlier. Symptoms such as bleeding need evaluation at any age.
Do you see children or teenagers?
The practice focuses on adult gastroenterology. Please call the office before booking to confirm the ages we see.
How soon can I get an appointment?
Call (346) 340-4414 for the next available Katy appointment. Online requests are confirmed by our team before a time is reserved.
Book Your Katy Gastroenterology Appointment
Get answers about digestive symptoms, liver concerns or colorectal cancer screening from Dr. Khan at our Katy office.
(346) 340-4414
For a medical emergency, call 911.