The 10 Best Gastroenterologists in Katy, TX
A plain-language starting point for finding digestive care, with the questions to ask before you book.
By Cole Rutherford, Senior Editor
A gut problem can make a normal day feel long. Finding a doctor should not add more stress. A GI doctor, or gastroenterologist, treats the digestive system.
These ten Katy-area doctors offer different types of care. Use the list to narrow your calls, then match the doctor to your needs and health plan. The order is an editorial guide, not a measure of medical skill or treatment results.
At a Glance
| # | Place | City | Known for | Price | Rating |
|---|---|---|---|---|---|
| 1 | James Maher, MD | Houston, near Katy | Visits and procedures with one doctor | Insurance varies | – |
| 2 | Pritesh Mutha, MD | Katy | Complex scope procedures | Insurance varies | – |
| 3 | Murtaza Arif, MD | Katy | General GI care in Katy | Insurance varies | – |
| 4 | Radha Tamerisa, MD | Katy | GI care with a focus on nutrition | Insurance varies | – |
| 5 | Hani Zamil, MD | Houston, near Katy | Hospital-based GI care | Insurance varies | – |
| 6 | Ting-Hui Hsieh, MD | Katy | Liver care | Insurance varies | – |
| 7 | Kevin Marks, MD | Katy | GI care and weight management | Insurance varies | – |
| 8 | Moazzam Sana, DO | Katy | Routine and advanced scope tests | Insurance varies | – |
| 9 | Dharmendra Verma, MD | Katy | Adult GI care at Cinco Ranch | Insurance varies | – |
| 10 | Vivian Asamoah, MD | Katy | Digestive care and nutrition | Insurance varies | – |
How We Chose Them
We reviewed official doctor, practice and hospital pages, with a fresh profile and source check on September 20, 2026. These picks help readers compare care focus and access. They do not rate medical outcomes.
- Care focus and training. We used the services and training named by the doctor’s practice or health system.
- Booking details. We checked the listed office and noted where addresses or procedure sites may differ.
The earlier August 6, 2026 review recorded active Texas licenses for all ten doctors. Check the current Texas Medical Board record before booking. Health plans, addresses and open visit times can change.
Our 10 picks
No. 1: James Maher, MD
The practice says Maher handles the visit, procedure and results.

James Maher, MD. James Maher, MD / Katy Stomach Doctor James Maher’s practice offers a clear point of contact. Its site says he handles the visit, test or treatment and results himself. The office also lists FibroScan, a test used to check liver stiffness and fat. That may suit someone who wants more of their care in one place.
The office is on Park Row in Houston, near Katy. Ask about the first open visit and where a scope test would take place. Bring a list of your medicines and past test results. Then check that the doctor and test site both take your health plan.
Before you go: Ask who will call with results and when to expect that call.Key facts- 19255 Park Row Blvd, Suite 104
- Doctor-led visits and procedures
- FibroScan listed
Pros
- One doctor for several steps of care
- Liver testing listed on site
Cons
- Houston address east of Katy
No. 2: Pritesh Mutha, MD
His UTHealth role focuses on advanced endoscopy.

Pritesh Mutha, MD. UTHealth Houston / Official physician profile Pritesh Mutha may be a fit when another doctor sends you for a complex scope test. His UTHealth page lists EUS, ERCP and other advanced scope procedures. He also leads its Third Space Endoscopy program. This work treats problems through layers of the gut wall.
You don’t need to learn every short form before calling. Start with the name of the test your doctor has asked for. Ask whether he does that test, where it takes place and which records to send. A local office visit does not mean the test or treatment happens at that same address.
Before you go: Have your referral note and past test reports ready.Key facts- Cinco Ranch area
- UTHealth Houston
- Advanced endoscopy
Pros
- Broad advanced-procedure list
- Academic medical team
Cons
- Tests may take place away from the clinic
No. 3: Murtaza Arif, MD
A local office for reflux, bowel concerns and colon screening.

Murtaza Arif, MD. Houston Methodist / Official physician profile Murtaza Arif sees patients in Katy near the Grand Parkway. Houston Methodist lists his GI board status and extra training in therapeutic endoscopy at Geisinger. His practice treats common gut problems and offers scope tests. That makes him a useful name to check for a first GI visit.
If you need help in another language, ask who will provide it during the visit. A language listed for an office may refer to staff as well as the doctor. For a test or treatment, check the test site’s name and costs too. The clinic bill may be only one part of the total.
Before you go: Look up both the doctor and test center in your health plan directory.Key facts- 410 W Grand Pkwy S, Suite 4B
- Therapeutic endoscopy at Geisinger
- Houston Methodist West
Pros
- Katy office
- General care and scope training
Cons
- Procedure bills can come from several providers
No. 4: Radha Tamerisa, MD
Her practice brings diet and weight into the GI visit.

Radha Tamerisa, MD. Katy Integrative Gastroenterology / Official physician profile Radha Tamerisa’s practice combines GI care with a focus on food, weight and daily habits. Her practice page lists her training and GI board status. That approach may appeal if you want to discuss meals and weight along with reflux or other gut concerns.
Ask what a first visit includes. A diet visit, lab test or weight program may have different health plan rules from a standard GI visit. You should leave with a clear next step and a way to ask follow-up questions. There is no need to buy a whole set of services before you understand the plan.
Before you go: Ask which visits and tests your health plan covers before booking extras.Key facts- 25230 Kingsland Blvd
- Katy Integrative Gastroenterology
- GI care, nutrition and weight
Pros
- Nutrition is part of the practice focus
- Katy location
Cons
- Some services may have different coverage rules
No. 5: Hani Zamil, MD
Houston Methodist lists him with its West GI team.

Hani Zamil, MD. Houston Methodist / Official physician profile Hani Zamil appears on Houston Methodist’s West GI team roster. The group lists care for problems with swallowing, the pancreas, gallbladder and bile ducts. Your doctor may send you here for care from a hospital-based GI team.
Call with the name of the service you need. Ask whether Zamil takes those cases now and where the visit or test would happen. The office is on Katy Freeway in Houston. A test on a hospital campus may bring an added site fee. Check the full cost with your plan.
Before you go: Ask for the test or treatment site and any separate facility charge.Key facts- 18300 Katy Freeway
- Houston Methodist
- West Houston gastroenterology
Pros
- Hospital-based team
- West Houston location
Cons
- Check individual services and scheduling directly
No. 6: Ting-Hui Hsieh, MD
His training includes liver and transplant care at Mayo Clinic.

Ting-Hui Hsieh, MD. Houston Gastro Institute / Official physician profile Ting-Hui Hsieh brings added liver training to his Katy practice. His practice page lists Mayo Clinic fellowships in GI and transplant liver care. It names liver disease, hepatitis and care before and after a liver transplant among his interests. He also treats common digestive problems.
For a liver visit, old records can help tell the story. Bring past blood-test results, scan reports and a list of medicines and supplements. Ask which test will track progress and when you’ll need it again. The practice lists Mandarin and Taiwanese language support; check what is offered for your visit.
Before you go: Bring older test results, not just the most recent report.Key facts- Houston Gastro Institute
- Mayo Clinic
- Ask about Mandarin and Taiwanese
Pros
- Added liver and transplant training
- General GI care also listed
Cons
- Confirm language support when booking
No. 7: Kevin Marks, MD
Premier Gastroenterology lists digestive and liver care.

Kevin Marks, MD. Premier Gastroenterology & Wellness / Official physician profile Kevin Marks practices at Premier Gastroenterology & Wellness in Katy. His practice profile lists training at Baylor and a focus that includes reflux, colon screening, liver care and weight. If more than one of those concerns brought you here, ask how the team would bring them into one plan.
Check the address before you drive. Some online listings still show an older office. Ask where any test or treatment would take place and who will explain the results. If a weight or diet service comes up, check its cost and coverage before you add it to your visits.
Before you go: Use the address confirmed by the office, since older listings can differ.Key facts- 521 W Grand Pkwy S
- Premier Gastroenterology & Wellness
- GI, liver and weight concerns
Pros
- Broad digestive-care focus
- Katy practice
Cons
- Older directories show a different address
No. 8: Moazzam Sana, DO
His TDDC profile lists a Katy office and several scope options.

Moazzam Sana, DO. TDDC / GI Alliance / Official physician profile Moazzam Sana is a doctor of osteopathic medicine, or DO. His TDDC bio lists GI training at Baylor Scott & White and extra work in advanced endoscopy. His services include colonoscopy, capsule endoscopy, EUS and ERCP. The group lists a Katy office in LaCenterra.
Ask which days he sees patients in Katy. A practice with several offices may use a different place for your test. The note from your doctor should name the test you need. The office can help explain the next step. Check the location, health-plan coverage and records needed before the visit.
Before you go: Confirm the Katy visit address and the separate test or treatment location.Key facts- 2840 Commercial Center Blvd, Suite 104
- DO
- Texas Digestive Disease Consultants
Pros
- Katy and Sugar Land locations
- Routine and advanced scope services
Cons
- Clinic and procedure locations may differ
No. 9: Dharmendra Verma, MD
UT Physicians lists new-patient visits at its Katy clinic.

Dharmendra Verma, MD. Memorial Hermann / Official physician profile Dharmendra Verma sees adults at UT Physicians Multispecialty in Cinco Ranch. His profile lists GI board status and training at UTHealth Houston. It also says he accepts new patients, though the first open date can change. The clinic is on Cinco Ranch Boulevard.
Start by telling the scheduler what brought you in. Bring any note from your doctor and past scope reports, and check your health plan’s rules. Some health-system pages list a different Katy address. Use the one on your visit notice, and ask whether a test would happen at another site.
Before you go: Check the address on your visit notice before heading out.Key facts- 23923 Cinco Ranch Blvd
- Adults
- UT Physicians
Pros
- Cinco Ranch clinic
- University health-system team
Cons
- Other systems may list a different address
No. 10: Vivian Asamoah, MD
Her practice combines GI care with food and lifestyle discussions.

Vivian Asamoah, MD. Houston Gastro Institute / Official physician profile Vivian Asamoah’s practice includes colon screening, reflux and other gut concerns, along with diet and daily habits. Her practice page lists GI, liver and diet training at Johns Hopkins. She practices at Houston Gastro Institute in Katy with Ting-Hui Hsieh and other team members.
Ask what the first visit covers and how long it will last. If the plan includes diet visits or added tests, get a clear cost before agreeing to them. You can also ask who handles results and follow-up. Those small details matter when you need care over several months.
Before you go: Ask which services use your GI benefits and which may cost extra.Key facts- Houston Gastro Institute
- Johns Hopkins
- GI care, nutrition and prevention
Pros
- GI and nutrition training
- Katy group practice
Cons
- Coverage can differ for added services
Frequently Asked Questions
How do I choose a GI doctor?
Start with the problem you need treated or the test your doctor has asked for. Check the doctor’s current Texas license and training. Then check that the doctor and test or treatment site both take your health plan.
Do I need a referral?
Your health plan sets the rule. Call the number on your health plan card and ask the GI office what it needs before your visit.
When should colon cancer screening start?
For adults with no symptoms and average risk, the USPSTF recommends screening from age 45 through 75. Ages 76 through 85 call for a personal decision with a clinician. New symptoms or a higher-risk history need a review with a doctor.
Does Medicare cover a screening colonoscopy?
Medicare Part B covers it every 24 months for people at high risk, and generally every 120 months for others. A 48-month rule can apply after a flexible sigmoidoscopy. If a polyp or tissue is removed, 15% cohealth plan can apply to the doctor and facility. The Part B deductible does not apply. Check the current Medicare page and your plan before the test.
What should I bring to my first visit?
Bring your health plan card, a list of drugs and doses, old test reports and the note from your doctor. Write down when the pain or other changes began. Note what makes them worse, too. Keep your questions on your phone so you don't have to recall them all in the room.
Sources & Methodology
We used the records, official pages and independent sources listed below to report and verify this guide. No source paid for placement.
- James Maher, MD: https://katystomachdoctor.com/about-dr-james-maher/ (checked September 20, 2026).
- Pritesh Mutha, MD: https://med.uth.edu/igut/2022/12/06/pritesh-r-mutha-md/ (checked September 20, 2026).
- Murtaza Arif, MD: https://www.houstonmethodist.org/doctor/murtaza-arif/ (checked September 20, 2026).
- Radha Tamerisa, MD: https://www.katygastrodoctor.com/radha-tamerisa-md-gastroenterologist-katy-houston-tx/ (checked September 20, 2026).
- Hani Zamil, MD: https://www.houstonmethodist.org/doctor/hani-zamil/ (checked September 20, 2026).
- Ting-Hui Hsieh, MD: https://www.houstongastroinstitute.com/meet-our-team (checked September 20, 2026).
- Kevin Marks, MD: https://www.kevinmarksmd.com/gi-staff/meet-our-providers/ (checked September 20, 2026).
- Moazzam Sana, DO: https://tddctx.com/moazzam-sana/ (checked September 20, 2026).
- Dharmendra Verma, MD: https://memorialhermann.org/doctors/gastroenterologists/dr-dharmendra-verma-md-1225142623 (checked September 20, 2026).
- Vivian Asamoah, MD: https://www.houstongastroinstitute.com/meet-our-team (checked September 20, 2026).
- medicare colonoscopy: https://www.medicare.gov/coverage/colonoscopies (checked September 20, 2026).
- uspstf colon: https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/colorectal-cancer-screening (checked September 20, 2026).
- tmb license: https://www.tmb.state.tx.us/page/look-up-a-license (checked September 20, 2026).
- doctor zamil team: https://www.houstonmethodist.org/spg/gastroenterology/west-houston/ (checked September 20, 2026).
- doctor marks secondary: https://memorialhermann.org/doctors/gastroenterologists/dr-kevin-marks-md-1679585228 (checked September 20, 2026).






