Find a Top Gastroenterologist Near Me in San Antonio, TX – Book an Appointment Instantly

Nicholas Martinez, MD, is a board-certified gastroenterologist providing complete care for patients at Gastroenterology Clinic of San Antonio. Dr. Martinez found his inspiration for pursuing a career in medicine after observing the health problems suffered by close family members when he was growing up. His experiences still inspire him as a doctor, and his patient, comforting manner reassures people who come to him for care, making them feel like family.

A native of San Antonio, Dr. Martinez speaks fluent Spanish as well as English. He earned his bachelor’s degree from Baylor University in Waco, Texas, before studying medicine at the University of Texas Health Science Center at San Antonio. He then stayed at UT Health San Antonio for his internal medicine residency and gastroenterology fellowship. During his training, Dr. Martinez received a humanitarian award for his outstanding patient care and exemplary bedside manner.

Dr. Martinez has a particular interest in inflammatory bowel disease (IBD), gastroesophageal reflux disease (GERD), and colon cancer prevention. He’s published many scholarly articles in leading medical journals, and regularly presents his research findings at national academic conferences. Dr. Martinez holds certification from the American Board of Internal Medicine, and has a decade of experience helping patients with a range of gastrointestinal disorders.

John Vizuete, MD, MPH, in San Antonio, is an expert and board-certified gastroenterologist with a cutting-edge and innovative approach to the field.

Dr. Vizuete completed his undergraduate studies at the University of Texas in Austin and received his medical degree from the University of Texas Health Science Center in San Antonio. He completed a master’s degree in public health at the University of Texas School of Public Health in Houston.

Dr. Vizuete went on to complete his residency in internal medicine and a fellowship in gastroenterology at the University of Texas Health Science Center. In 2018, he joined the Gastroenterology Clinic of San Antonio.

Dr. Vizuete is committed to providing his patients with individualized care and spends the time necessary to understand the root cause and effects of each symptom. He recognizes that gastrointestinal health is complex and that sometimes a symptom can either be part of a much larger condition or a complex spiritual and emotional issue.

He is devoted to building long-lasting relationships with his patients and always makes himself available to answer their questions. In fact, when you establish care with him, you’ll get Dr. Vizuete’s personal email address for quicker responses and more personal treatment.

Dr. Vizuete is excited about current trends in his field and always strives to offer top-of-the-line, innovative, and interdisciplinary treatment to all of his patients.

Allison Harrington Sirakos, MD, is a skilled board certified gastroenterologist providing expert care in San Antonio, Texas, at the Gastroenterology Clinic of San Antonio. Dr. Sirakos manages all gastrointestinal disorders but has expertise in colon cancer screening , liver disease, acid reflux, irritable bowel syndrome (IBS) and other disorders of the gut-brain interaction.

After earning her Doctor of Medicine at the University of Texas Southwestern Medical Center in Dallas, Texas, Dr. Sirakos relocated to New York, completing her internal medicine residency at New York University (NYU) Grossman School of Medicine in Manhattan.

Dr. Sirakos returned to Texas to finish her gastroenterology fellowship training at the University of Texas Health Science Center at San Antonio. During her final year of training, she served as the chief of education. 

Dr. Sirakos is board certified in internal medicine by the American Board of Internal Medicine (ABIM) and holds a license to practice medicine in Texas. 

When it comes to patient care, Dr. Sirakos takes an integrative approach, combining traditional medical care with innovative techniques and complementary therapies with the overall goal of improving quality of life.

Robert Narvaez, MD, MBA, is an experienced gastroenterologist at Digestive & Liver Disease Center of San Antonio PLLC, a digestive health care center. As one of the top colon cancer specialists in San Antonio, Texas, Dr. Narvaez believes his training was an invaluable foundation for his expertise as a gastroenterologist. But above all, he believes in the importance of taking time to focus on each patient and who they are outside of their condition.

Medical excellence is the foundation of Digestive & Liver Disease Center of San Antonio PLLC. Dr. Narvaez provides patients with the most advanced diagnostic methods available for a wide range of conditions such as colorectal cancer, liver disease, gallbladder problems, heartburn, and more. As a digestive specialist, Dr. Narvaez consistently receives referrals from other doctors who respect his knowledge and expertise. In fact, doctors don’t just recommend their patients and family members to Dr. Narvaez, they go to him as well.

Dr. Narvaez earned his Bachelor of Science in biology from St. Mary’s University in San Antonio, Texas, graduating cum laude. He obtained his Master of Business Administration from Our Lady of the Lake University, also in San Antonio. He pursued his medical degree at Creighton University School of Medicine in Omaha, Nebraska, before completing his residency in internal medicine there. Afterward, he completed a fellowship in gastroenterology at Wilford Hall Ambulatory Surgical Center in San Antonio, Texas. 

Prior to Digestive & Liver Disease Center of San Antonio PLLC, Dr. Narvaez served as the former chief of the gastroenterology clinic at Robert L. Thompson Regional Hospital – Carswell Air Force Base in Fort Worth, Texas. He was also the president of the United Surgeons of San Antonio. Dr. Narvaez also established Home Technology Health Care, Inc., a corporation to deliver and manage parenteral and enteral nutrition for patients with digestive disorders.

Dr. Narvaez enjoys sharing his expertise with other respected leaders in his field and remains active in many professional organizations, including the American College of Gastroenterology, American Association of Physicians and Surgeons, American Society for Parenteral and Enteral Nutrition, American Telemedicine Association, Texas Medical Association, and Bexar County Medical Society.

Outside of work, Dr. Narvaez is passionate about giving back to the community. He is involved with many churches in San Antonio and contributes to charities for teenage mothers, homeless shelters, and various women’s organizations. In his free time, he enjoys weight lifting, fishing, and hunting.

Andrea Bowden, PA-C, is a board-certified physician assistant at Heights Dermatology in Tomball, Texas. She joined the practice in 2022

Andrea grew up in Round Rock, TX. She graduated Cum Laude from Texas A&M University with her Bachelor of Science in Health. She then went on to receive her Master’s of Science in Physician Assistant Studies from the University of Texas Medical Branch in 2017. Prior to completing her graduate studies, Andrea worked as a medical assistant in dermatology which motivated her to focus her sights on becoming a dermatology PA.

Prior to her arrival at Heights Dermatology, Andrea specialized in gastroenterology at UTMB in League City, TX. She has received personal training in dermatology from Dr. Alpesh Desai, DO, and Dr. Tejas Desai, DO. She practices in the areas of general, cosmetic, and surgical dermatology. Andrea has a passion for providing a positive bed-side manner to formulate a diagnosis. Her goal is to actively collaborate with her patients to come up with an effective treatment plan that works for each individual patient.

Andrea is licensed by the Texas Medical Board and certified by the National Commission on Certification of Physician Assistants. She is a member of the Society of Dermatology Physician Assistants, the American Academy of Physician Assistants, the Texas Association of Physician Assistants, and the Texas Gulf Coast PA Association. In her free time, Andrea enjoys traveling, trying new restaurants, being active, and spending time with her family, friends, and dog Norah.

Board-certified gastroenterologist Muhammad Naeem, MD, leads the team at Advanced Gastroenterology Associates of SA. At the warm, inviting practice in San Antonio, Texas, Dr. Naeem provides expert diagnosis and treatment for a variety of gastroenterology conditions. 

Dr. Naeem graduated from Allama Iqbal Medical College, University Of Health Sciences Lahore medical school in 1984. He completed his internship and residency in internal medicine at St. Louis University School of Medicine in Missouri. Dr. Naeem rounded out his medical studies with a fellowship in gastroenterology from the University of Texas Health Science Center at San Antonio.

Following his postgraduate training, Dr. Naeem worked as a staff gastroenterologist at several practices throughout California and Texas. Since 2017, he has worked at Advanced Gastroenterology Associates of SA where he offers state-of-the-art advanced endoscopy services and immune system enhancement to optimize the treatment of digestive disorders.

Dr. Naeem is board-certified in gastroenterology and internal medicine by the American Board of Internal Medicine, and is also a Fellow of the American College of Physicians. He maintains memberships with the American College of Gastroenterology, the Texas Society of Gastrointestinal Endoscopy, the Bexar County Medical Society, and the Texas Medical Association.

Throughout his career, Dr. Naeem has presented at several national meetings on various topics in the field of gastroenterology. He has also participated in research projects and contributed to publications related to gastroenterology, immunology, virology, and more.

Board-certified gastroenterologist Muhammad Naeem, MD, leads the team at Advanced Gastroenterology Associates of SA. At the warm, inviting practice in San Antonio, Texas, Dr. Naeem provides expert diagnosis and treatment for a variety of gastroenterology conditions. 

Dr. Naeem graduated from Allama Iqbal Medical College, University Of Health Sciences Lahore medical school in 1984. He completed his internship and residency in internal medicine at St. Louis University School of Medicine in Missouri. Dr. Naeem rounded out his medical studies with a fellowship in gastroenterology from the University of Texas Health Science Center at San Antonio.

Following his postgraduate training, Dr. Naeem worked as a staff gastroenterologist at several practices throughout California and Texas. Since 2017, he has worked at Advanced Gastroenterology Associates of SA where he offers state-of-the-art advanced endoscopy services and immune system enhancement to optimize the treatment of digestive disorders.

Dr. Naeem is board-certified in gastroenterology and internal medicine by the American Board of Internal Medicine, and is also a Fellow of the American College of Physicians. He maintains memberships with the American College of Gastroenterology, the Texas Society of Gastrointestinal Endoscopy, the Bexar County Medical Society, and the Texas Medical Association.

Throughout his career, Dr. Naeem has presented at several national meetings on various topics in the field of gastroenterology. He has also participated in research projects and contributed to publications related to gastroenterology, immunology, virology, and more.

Andrea Bowden, PA-C, is a board-certified physician assistant at Heights Dermatology in Tomball, Texas. She joined the practice in 2022

Andrea grew up in Round Rock, TX. She graduated Cum Laude from Texas A&M University with her Bachelor of Science in Health. She then went on to receive her Master’s of Science in Physician Assistant Studies from the University of Texas Medical Branch in 2017. Prior to completing her graduate studies, Andrea worked as a medical assistant in dermatology which motivated her to focus her sights on becoming a dermatology PA.

Prior to her arrival at Heights Dermatology, Andrea specialized in gastroenterology at UTMB in League City, TX. She has received personal training in dermatology from Dr. Alpesh Desai, DO, and Dr. Tejas Desai, DO. She practices in the areas of general, cosmetic, and surgical dermatology. Andrea has a passion for providing a positive bed-side manner to formulate a diagnosis. Her goal is to actively collaborate with her patients to come up with an effective treatment plan that works for each individual patient.

Andrea is licensed by the Texas Medical Board and certified by the National Commission on Certification of Physician Assistants. She is a member of the Society of Dermatology Physician Assistants, the American Academy of Physician Assistants, the Texas Association of Physician Assistants, and the Texas Gulf Coast PA Association. In her free time, Andrea enjoys traveling, trying new restaurants, being active, and spending time with her family, friends, and dog Norah.