Meet the Physicians

Find a Physician

Medical Services
- All Services
- Emergency
- Family
- Specialized
Patients & Visitors
- All Patients & Visitors Information
- For Patients
- For Visitors
- General Information
- Contact UMC
Careers
- All Careers
- Nursing Opportunities
  - Use this section as a helpful guide to learn more about what UMC does for nurses and ways to impact your career as a nurse with UMC.
  - Apply Now
  - Learn More
- Work at our Hospital
  - We’ve learned that what is best for patients is also best for employees. Learn more about why we are one of the Best Companies to Work for in Texas®.
  - Apply Now
- Work at our Clinics
  - Looking for opportunities around town? This section will tell you more about our clinics and the services they provide.
  - Apply Now
Giving
- All Giving
- Give to UMC
  - Your investment in UMC helps to continue to provide the best possible care for each and every patient.
  - Children's Miracle Network
  - Donate to UMC
  - Guardian Angel
  - UMC Foundation
  - Volunteering
- UMC Gives Back
  - It’s important to us to give back to this community because without you, we wouldn’t be here.
  - LISD’s Partners in Education
  - United Way
Connect With Us

Menu

Meet the Physicians

YOU ARE HERE

Download UMC Pregnancy on the App Store or Google Play to empower you in your & baby's health! x

Print this Page

Gastroenterology

Hamed AlTamimi, MD

Hamed Al-Tamimi, MD

UMC Physicians Gastroenterology

Sameer Islam, MD

Sameer Islam, MD

UMC Southwest Gastroenterology

Robert Simek, MD

Robert Simek, MD

UMC Southwest Pediatric Gastroenterology

Vanessa Costilla

Vanessa Costilla, MD

UMC Southwest Gastroenterology

Best Companies to Work for in Texas 2017

HG-opea

2018 Women's Choice Award