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Cardiologists near you

Cardiologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Chicago, IL
  4. Dallas, TX
  5. Detroit, MI
  6. Houston, TX
  7. Los Angeles, CA
  8. Miami, FL
  9. Minneapolis, MN
  10. New York, NY
  11. Orlando, FL
  12. Philadelphia, PA
  13. Phoenix, AZ
  14. Riverside, CA
  15. San Antonio, TX
  16. San Diego, CA
  17. San Francisco, CA
  18. Seattle, WA
  19. St. Louis, MO
  20. Tampa, FL
  21. Washington, DC

Chiropractors near you

Chiropractor providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Dentists near you

Dentist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Dermatologists near you

Dermatologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. St. Louis, MO
  22. Tampa, FL
  23. Washington, DC

Family Physicians near you

Family Physician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

OB-GYNs near you

OB-GYN providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Ophthalmologists near you

Ophthalmologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Charlotte, NC
  4. Chicago, IL
  5. Dallas, TX
  6. Denver, CO
  7. Detroit, MI
  8. Houston, TX
  9. Los Angeles, CA
  10. Miami, FL
  11. Minneapolis, MN
  12. New York, NY
  13. Orlando, FL
  14. Philadelphia, PA
  15. Phoenix, AZ
  16. Riverside, CA
  17. San Diego, CA
  18. San Francisco, CA
  19. St. Louis, MO
  20. Tampa, FL
  21. Washington, DC

Orthopedic Surgeons near you

Orthopedic Surgeon providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Pediatricians near you

Pediatrician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Physical Therapists near you

Physical Therapist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Podiatrists near you

Podiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. New York, NY
  13. Orlando, FL
  14. Philadelphia, PA
  15. Phoenix, AZ
  16. Riverside, CA
  17. San Antonio, TX
  18. San Diego, CA
  19. San Francisco, CA
  20. Seattle, WA
  21. St. Louis, MO
  22. Tampa, FL
  23. Washington, DC

Psychiatrists near you

Psychiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.

  1. Atlanta, GA
  2. Baltimore, MD
  3. Boston, MA
  4. Charlotte, NC
  5. Chicago, IL
  6. Dallas, TX
  7. Denver, CO
  8. Detroit, MI
  9. Houston, TX
  10. Los Angeles, CA
  11. Miami, FL
  12. Minneapolis, MN
  13. New York, NY
  14. Orlando, FL
  15. Philadelphia, PA
  16. Phoenix, AZ
  17. Riverside, CA
  18. San Antonio, TX
  19. San Diego, CA
  20. San Francisco, CA
  21. Seattle, WA
  22. St. Louis, MO
  23. Tampa, FL
  24. Washington, DC

Gateway Gastroenterology

Overall rating

4.9
4.9

Top reviews

No one I know is skipping in to any gastrointestinal exam like it’s the most thrilling day of their life. But, at a certain age, it’s an important thing to check off your to do list. Dr Haas and his team at Gateway made my colonos... Read more No one I know is skipping in to any gastrointestinal exam like it’s the most thrilling day of their life. But, at a certain age, it’s an important thing to check off your to do list. Dr Haas and his team at Gateway made my colonoscopy appointment so much more comfortable. The facility is so nice and so clean and every staff member I encountered from phone calls prior through the entire check in process and then waking up post procedure was so professional and so calm and reassuring. The whole experience was very fast and easy. I’m glad I made the choice to go to Dr Haas at Gateway and I’m happy to have the peace of mind that comes with a thorough check up by a top notch physician. I would highly recommend Dr Haas and Gateway Gastroenterology to anyone who needs to have a colonoscopy.
Read less
Angela M. • August 01, 2025
I’ve been very pleased with DR. Riegel. His office staff is nice and very knowledgeable . Especially Sara his nurse practitioner! I would be very pleased to recommend Dr Riegel to anyone. He described my situation very r Well ... Read more I’ve been very pleased with DR. Riegel. His office staff is nice and very knowledgeable . Especially Sara his nurse practitioner! I would be very pleased to recommend Dr Riegel to anyone. He described my situation very r Well to Son Eric and I in great detail and answered both our questions thoroughly! I will not hesitate to recommend him and his office staff! Gail E. Pierce
Read less
Gail P. • August 14, 2025
Read more reviews

About Gateway Gastroenterology

At Gateway Gastroenterology in Chesterfield, Missouri, we specialize in digestive health and liver disease. Our board-certified gastroenterologists and advanced nurse practitioners provide consultations and services in a friendly, clear and understandable way to provide you with the best possible care. It’s one of the reasons why our physicians have been recognized as BEST DOCTORS by the St. Louis Magazine.

Our highly-trained physicians specialize in diagnosing and treating a wide range of gastrointestinal conditions, including acid reflux, irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), and liver disease. We work together as a group; however, each patient is cared for by a single gastroenterologist. Continuity and trust is built by maintaining stable and long-lasting relationships. For emergencies, a Gateway gastroenterologist is available to answer your call.

In addition to patient care at our main office in Chesterfield, Gateway Gastroenterology performs colonoscopy and upper endoscopy procedures at Gateway Endoscopy Center (Saint Louis), Saint Louis Multi-Specialty Surgery Center (Ballwin), and St Luke’s Hospital (Chesterfield). The team performs diagnostic tests like capsule endoscopies, breath tests, and infusion services right in our main office. Ask about Saturday hours at Gateway Endoscopy Center for routine procedures.

We are preferred providers on many insurance plans, and our experienced administrative staff is here to help you with questions on reimbursement. At Gateway Gastroenterology, patients come first. Please contact us today and let us partner with you in understanding your digestive health.

 

 

Insurances

  • Aetna
  • Ambetter Health
  • Anthem Blue Cross Blue Shield
  • Cigna
  • ESSENCE Healthcare
  • HealthLink
  • Medicare
  • UnitedHealthcare Oxford

Specialties

  • Gastroenterologist
  • Internist
  • Nurse Practitioner
  • General Practice Physician
  • Registered Nurse

Services

  • Abdominal Pain
  • Acid Reflux
  • Barrett’s Esophagus
  • Capsule Endoscopy
  • Celiac Disease
  • Colon Cancer Screening
  • Colonoscopy
  • Conditions
  • Constipation
  • Crohn’s Disease

Locations (5)

Gateway Gastroenterology

12855 N. 40 Drive
Suite 150, South Tower
Saint Louis, MO, 63141
Get directions

Gateway Gastroenterology

121 Saint Luke's Center Drive
Suite 406, Building A
Chesterfield, MO, 63017
Get directions

Gateway Gastroenterology

1040 Old Des Peres Rd
Des Peres, MO, 63131
Get directions

Gateway Gastroenterology

884 Woods Mill Road
Suite 100
Ballwin, MO, 63011
Get directions

Gateway Gastroenterology

232 S. Woods Mill Road
Suite 130
Chesterfield, MO, 63017
Get directions

Providers (11)

Dr. Jeffrey Mathews, MD
4.9250399 (627)

Dr. Jeffrey Mathews, MD

Gastroenterologist

4.9 (627)
12855 N. 40 Drive
Suite 150, South Tower
Saint Louis, MO, 63141
And 2 more locations
View profile Call now
Dr. Rajeev Ramgopal, MD
4.8925081 (614)

Dr. Rajeev Ramgopal, MD

Gastroenterologist

4.9 (614)
12855 N. 40 Drive
Suite 150, South Tower
Saint Louis, MO, 63141
And 2 more locations
View profile Call now
Dr. Richard Riegel, MD
4.9324547 (607)

Dr. Richard Riegel, MD

Gastroenterologist

4.9 (607)
12855 N. 40 Drive
Suite 150, South Tower
Saint Louis, MO, 63141
And 2 more locations
View profile Call now
Dr. Brian McMorrow
4.9080882 (544)

Dr. Brian McMorrow

Gastroenterologist

4.9 (544)
1040 Old Des Peres Rd
Des Peres, MO, 63131
And 2 more locations
View profile Call now
Mrs. Kaitlin Schild, AGNP-C
4.9007353 (544)

Mrs. Kaitlin Schild, AGNP-C

Nurse Practitioner

4.9 (544)
1040 Old Des Peres Rd
Des Peres, MO, 63131
And 1 more location
View profile Call now
Dr. Andrew Su, MD
4.9132841 (542)

Dr. Andrew Su, MD

Gastroenterologist

4.9 (542)
12855 N. 40 Drive
Suite 150, South Tower
Saint Louis, MO, 63141
And 2 more locations
View profile Call now
Mrs. Cheri Carmody, RN BC ANP
4.9226415 (530)

Mrs. Cheri Carmody, RN BC ANP

Nurse Practitioner

4.9 (530)
1040 Old Des Peres Rd
Des Peres, MO, 63131
And 1 more location
View profile Call now
Dr. Fred Williams
4.9208333 (480)

Dr. Fred Williams

Gastroenterologist

4.9 (480)
12855 N. 40 Drive
Suite 150, South Tower
Saint Louis, MO, 63141
And 2 more locations
View profile Call now
Sarah Keim
4.8955614 (383)

Sarah Keim

Nurse Practitioner

4.9 (383)
121 Saint Luke's Center Drive
Suite 406, Building A
Chesterfield, MO, 63017
And 1 more location
View profile Call now
Dr. Siri Ancha, MD
4.9030471 (361)

Dr. Siri Ancha, MD

General Practice Physician

4.9 (361)
1040 Old Des Peres Rd
Des Peres, MO, 63131
And 1 more location
View profile Call now
Taylor Geisman, MD
4.9030471 (361)

Taylor Geisman, MD

Internist

4.9 (361)
884 Woods Mill Road
Suite 100
Ballwin, MO, 63011
And 4 more locations
View profile Call now

Reviews

Overall rating

4.9
5593 Reviews

Newest reviews

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