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Patient Resources · Katy & Cypress, TX
Patient Resources for United Gastroenterology Associates
Find what you need before and after your visit: appointment requests, referrals, insurance and self-pay information, procedure preparation instructions, patient education and trusted health information. United Gastroenterology Associates, PLLC is the practice of Muhammad Ali Khan, MD, FACP, FASGE, a board-certified gastroenterologist with offices in Katy and Cypress serving Greater Houston. Call (346) 340-4414.
Questions: (346) 340-4414
Find What You Need
New patients usually need three things: an appointment, insurance or self-pay information, and, if a procedure is scheduled, preparation instructions. Use the groups below to go straight to the right page. If you cannot find what you need, call the office at (346) 340-4414.
Patient Resources by Topic
Pages organized by what you are trying to do.
Before Your First Visit
Request an appointment, physician referrals and office locations.
Insurance and Costs
Insurance plans, self-pay visits, self-pay colonoscopy and self-pay endoscopy.
Preparing for a Procedure
All procedure preparations, colonoscopy prep by prep type, general colonoscopy instructions and ERCP prep.
Understanding Your Care
Patient education, procedures and digestive conditions. Not sure who to see? Read about digestive disease specialists.
Screening and Prevention
Colorectal cancer screening guidelines and preventive health counseling.
About the Physician
Trusted Health Information by Topic
These national organizations publish reliable, patient-friendly information. External links open in a new tab. They do not replace advice from your own doctor.
| Topic | Trusted source |
|---|---|
| Colon cancer | American Cancer Society: Colorectal Cancer. See also screening guidelines. |
| Diverticular disease | NIDDK: Diverticulosis and Diverticulitis |
| Foodborne illness | CDC: Food Safety |
| Acid reflux and GERD | NIDDK: Acid Reflux (GER and GERD) in Adults |
| Gastrointestinal cancers | National Cancer Institute: Cancer Types |
| Inflammatory bowel disease | Crohn's & Colitis Foundation |
| Irritable bowel syndrome | NIDDK: Irritable Bowel Syndrome |
| Peptic ulcer disease | NIDDK: Peptic Ulcers (Stomach Ulcers) |
| Viral hepatitis | CDC: Viral Hepatitis |
| Digestive health topics | American College of Gastroenterology: Patient Center |
| Substance use support | SAMHSA National Helpline, free and confidential, 1-800-662-4357 |
OUR BLOG
Latest Patient Articles
Endoscopy vs Colonoscopy: What’s the Difference?
Sep 10, 2026
When a doctor recommends an endoscopy or colonoscopy, it is natural to wonder why you need the procedure and...
Positive Cologuard Test: Do You Need a Colonoscopy?
Sep 8, 2026
A positive Cologuard test does not mean you have colon cancer, but it does mean you need the right follow-up...
What Happens During an Upper Endoscopy? A Step-by-Step Guide for Patients
Sep 7, 2026
If your gastroenterologist has recommended an upper endoscopy, also called an esophagogastroduodenoscopy or...
Need Help Finding Something?
Call the office and the team will point you to the right instructions, forms or information.
Patient Resources FAQs
Quick answers to common patient questions.
How do I become a new patient at United Gastroenterology Associates?
Call (346) 340-4414 or use the appointment request page. Have your insurance card ready, and check whether your plan requires a referral from your primary care physician.
Where can I find my colonoscopy prep instructions?
Go to the colonoscopy prep page and choose the prep your doctor prescribed: Clenpiq, CoLyte, MoviPrep, Plenvu, Suflave, Sutab or Suprep. Read the general colonoscopy instructions first. Instructions for other procedures are on the procedure preparation page.
Which insurance plans does the practice accept?
United Gastroenterology Associates participates with many major insurance plans. Coverage and benefits depend on the patient's specific plan and must be verified. Please contact the office or your insurance carrier to verify benefits for your specific plan and service.
Can I be seen without insurance?
Yes. Self-pay options are available for consultations, colonoscopy and upper endoscopy. Uninsured and self-pay patients can request a Good Faith Estimate of expected charges for scheduled care.
How can my doctor refer me?
Referring physicians can use the physician referral page or call the office at (346) 340-4414.
Where can I find reliable information about my digestive condition?
This page lists trusted national sources, such as the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), the CDC, the American Cancer Society and the American College of Gastroenterology. Bring your questions to your appointment so Dr. Khan can explain how the information applies to you.
What should I do in a medical emergency?
Call 911 or go to the nearest emergency room for vomiting blood, black or tarry stools, heavy rectal bleeding, fainting or sudden severe abdominal pain.
United Gastroenterology Associates Offices
Patients from Houston, Katy, Cypress, Fulshear, Richmond, Rosenberg and nearby communities are seen at both offices.
United Gastroenterology Associates – Katy
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)
United Gastroenterology Associates – Cypress
Northwest Freeway (US-290) in Cypress
- Address: 21216 Northwest Freeway, Suite 640, Cypress, TX 77429
- 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)
Ready to Schedule Your Visit?
Call (346) 340-4414 or request an appointment with Dr. Khan in Katy or Cypress.
Sources
- National Institute of Diabetes and Digestive and Kidney Diseases. Digestive Diseases. niddk.nih.gov
- American College of Gastroenterology. Patient Center. gi.org
External resources are provided for general information. United Gastroenterology Associates does not control their content. This page does not replace personal medical advice. For a medical emergency, call 911. Last updated October 5, 2026.