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. New York, NY
  10. Orlando, FL
  11. Philadelphia, PA
  12. Phoenix, AZ
  13. Riverside, CA
  14. San Antonio, TX
  15. San Diego, CA
  16. San Francisco, CA
  17. Seattle, WA
  18. St. Louis, MO
  19. Tampa, FL
  20. 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. 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

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
Dr. Andrew Su, MD, Gastroenterologist

Dr. Andrew Su, MD

Gastroenterologist

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

+2 more locations

Overall rating

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 colonosShow morecopy 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.

Angela M. • August 01, 2025

Meeting Dr.Hass was just an amazing experience. He was so down to earth, answered all my questions and explained everything to me in every day terms not medical terms. I left the appointment feeling that I was in great hands. Show moreIt has only been 1 days since my appointment and I have already recommended him to a friend.

Marianne D. • August 29, 2025

Read more reviews
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Dr. Andrew Su, MD?


About Dr. Andrew Su, MD

Jason Haas, D.O. is dedicated to providing the highest quality of care to all his patients.  He has strong communication skills which allow him to connect with patients, staff and colleagues. 

 

For the past eight years, Dr. Haas has been a gastroenterologist practicing in Springfield, Missouri with Cox Medical Clinic.  He is a board-certified gastroenterologist that completed his GI Fellowship training at Aurora Health Care in Milwaukee, WI and his Internal Medicine Residency at Gundersen Health Care in LaCrosse, WI.  

 

His wife is from. St. Louis, and in their spare time Dr. Haas enjoys traveling with her and their two daughters.  Dr. Haas has been a member of the Colorectal Awareness Party in Springfield, which helps raise money and provide free colonoscopy evaluations for patients in need.


Services, Conditions and Procedures

Abdominal Pain

Acid Reflux

Barrett’s Esophagus

Capsule Endoscopy

Celiac Disease

Colon Cancer Screening

Colonoscopy

Conditions

Constipation

Crohn’s Disease

Diarrhea

Double (Bi-Directional) Endoscopy

Eosinophilic Esophagitis

Fatty Liver

FibroScan

Fructose Intolerance Testing

Hemorrhoids

Hydrogen and Methane Breath Testing

IBD

IBS

Infusion Services

Lactose Intolerance Testing

Liver Disease

Research

Services

Small Intestinal Bacterial Overgrowth (SIBO)

Ulcerative Colitis

Upper Endoscopy


Locations (3)

Gateway Gastroenterology

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

Gateway Gastroenterology

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

Gateway Gastroenterology

1040 Old Des Peres Rd
Des Peres, MO, 63131


More About Dr. Andrew Su, MD

Practice

Gateway Gastroenterology

Specialties

Insurance

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

NPI Number

1962402925

Provider's Gender

Male


Reviews

4.91
542 Reviews

Meeting Dr.Hass was just an amazing experience. He was so down to earth, answered all my questions and explained everything to me in every day terms not medical terms. I left the appointment feeling that I was in great hands. It has only been 1 days since my appointment and I have already recommended him to a friend.

Marianne D. • August 29, 2025

Dr Haas was very helpful ?. We are now a patient of his. Thank you

John Y. • August 27, 2025

Very thorough. Good description and explanation. Answered all questions. Felt comfortable and relaxed. Appointment was scheduled promptly and no waiting time at visit. Friendly and efficient follow up process.

Robert T. • August 27, 2025

Dr. Haas was very kind and understanding. I felt he was really listening to me and he addressed all my concerns. I really appreciated how he explained everything to me.

Barbara H. • August 23, 2025

Dr Haas listened to all my questions and concerns that I had. He took the time to explain all the answers to the questions I had. He time he took was very much appreciated.

Jason S. • August 21, 2025

Aware of options to consider

John C. • August 19, 2025

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.

Angela M. • August 01, 2025

I had a great experience with Dr. Haas and the entire staff. Everyone was welcoming, and made me feel completely at ease. It is clear that patient comfort and care are a priority.

Vanessa V. • July 27, 2025

Great doctor. Really gets to know what is going on and wants his patients to feel better. Very informative doctor. Would recommend to anyone.

Kortney H. • July 17, 2025

Very good experience with Gateway Gastroenterology & Dr. Jason Haas. Excellent, efficient staff ... highly recommend!

Heidi K. • June 28, 2025

Quick and easy procedure! It only took about an hour start to finish.

Emmy K. • June 04, 2025

Positive experience. Everyone was professional and on time.

Denise S. • May 27, 2025

Everyone is professional and personable. Doctor Haas didn’t rush his explanation and took time with me.

Denise S. • May 24, 2025

Everything went very smoothly

Steven W. • May 18, 2025

Everyone there was the greatest

Samuel M. • May 13, 2025

Five stars. Dr. Hass,DO. He is very thorough and kind. Makes the patient feel calm and relaxed.

E T. • May 04, 2025

The entire Staff was welcoming and very caring! I wouldn't go anywhere else for my colonoscopy.

Jane A. • April 15, 2025

Dr. Haas has treated me with patience and empathy. He takes time to explain everything I have questions about, never in a hurry to end the consult. Meticulous in every aspect of my care he listens carefully to every concern I have. I am completely comfortable and satisfied with the level of medical care I receive in Dr Haas's office.

Debra S. • April 15, 2025

Very informative and friendly!

Marsha D. • April 11, 2025

Professional, caring, informative

Joyce H. • April 06, 2025

I was kept informed throughout the process, and kept comfortable,

John B. • April 02, 2025

The nurses were so kind and caring, very short wait time. Dr. Haas was very professional and thorough. Made an unpleasant procedure very pleasant.

Nicole A. • March 29, 2025

Doctor Haas is very nice and friendly listens to what you have to say. And all the staff were very nice. Also thank you

Suzanne S. • March 28, 2025

Dr. Haas took the time to listen to me and try to make sure I am doing what is best for my health.

Stacey B. • March 22, 2025

Very good very thorough and my nurses and doctor haas were very nice so thank you for taking care of me.

Kent D. • March 03, 2025

Dr Haas was very pleasant to talk to. He was very informative about my procedure, before and after. If I need similar procedures in the future, I would definitely try to come back to Dr Haas. He was great.

Roy R. • February 23, 2025

Dr Hass is excellent. Explained everything well. Took the time to answer all my questions. Very caring and compassionate and easy to talk to. Helped me make some difficult decisions. I would highly recommend him to anyone with any GI concerns.

Carolyn M. • February 22, 2025

Excellent procedure from start to finish.

Bruce P. • February 16, 2025

He was super helpful!

Brianna R. • January 17, 2025

Very professional and felt confident with Dr. Haas. I would recommend him

Patricia V. • January 14, 2025

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