GI Alliance

Gastroenterology • Mansfield, TX

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About

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Clinic Type

Gastroenterology

Address

647 N. Miller Rd, Suite 200, Mansfield, TX 76063

Phone

817-760-7969

Email

communications@gialliance.com

Opening Hours

Monday – Thursday 8:00 AM – 5:00 PM; Friday 9:00 AM – 1:30 PM

Website

https://tddctx.com/gi-alliance-mansfield-tx-n-miller-rd/

Emergency Care

If you are experiencing a medical emergency, please call 9-1-1.

Services Offered

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Team

Gregory Brennan, M.D. — Gastroenterologist
Suwebatu T. Odunsi-Shiyanbade, M.D. — Gastroenterologist
Moustafa Youssef, M.D. — Gastroenterologist

Insurance & Payment

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Pay My Bill

Languages Spoken

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FAQs

To schedule an appointment, how can I contact the clinic?

To schedule an appointment, please call 817-760-7969 or click the “Message Us” button located at the bottom right corner of your screen and a member of our team will contact you within 48 hours.

Social Media

Twitter Facebook

Photos

What Patients Say

Overall sentiment across review platforms: positive

giallianceofmansfield.com/Trustindex: 4.8 out of 5 stars (Over 1,100 reviews (site-aggregated))
Healthgrades (Dr. Gregory Brennan): 4.8 out of 5 stars (67 ratings)

Patients praise

Patients often describe the medical staff as caring, compassionate, and attentive
High level of confidence in specific physicians such as Dr. Brennan and Dr. Youssef
Positive experiences with the efficiency and bedside manner during procedures
Professional and welcoming environment noted by many reviewers

Common complaints

Difficulty reaching the office via phone, including issues with voicemails not being returned
Long wait times for appointments and while in the office waiting room
Reports of rude or unhelpful administrative/receptionist staff
Occasional patient dissatisfaction with communication or feeling brushed off during care

"I had seen the doctor before and after the procedure and he took the time to hear any concerns I had and explained what he saw. I was also quite impressed with the friendly staff."

— Healthgrades user review

"It's already more than 75 minutes past my appointment time (4:50pm) and I have not seen the doctor. Wouldn't recommend this office if you have any kind of schedule during your day."

— LocalityBiz user review

"Dr. Yousef and his staff do a excellent job getting you in and out. Offering great bedside manner."

— LocalityBiz user review

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].