Summary

Dr. Jason Haas is a board-certified gastroenterologist and internal medicine physician who earned his medical degree from A T Still University Kirksville College of Osteopathic Medicine. With 18 years of clinical experience, he specializes in diagnosing and treating disorders of the digestive system while also providing comprehensive internal medicine care. Dr. Haas speaks English and brings nearly two decades of expertise to his patient care.

He practices at multiple locations across Missouri, including Springfield and Chesterfield, with affiliations at CoxHealth Medical Center South, Saint Lukes Hospital, and Meyer Orthopedic and Rehabilitation Hospital. Dr. Haas frequently treats patients with hemorrhoids, colon polyps, and diverticular disease. His procedural expertise includes performing colonoscopies and both upper and lower gastrointestinal endoscopies to diagnose and monitor digestive health conditions. Patients rate Dr. Haas an average of 4.2 out of 5 stars for his care.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.2
  • 18 years of experience
  • speaks English
  • A T Still University Kirksville College Of Osteopathic Medicine
  • 5 written reviews
  • 2 specialties
  • 9 areas of expertise
  • 3 hospital affiliations
  • 5 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Jason Martin Haas has 5 locations

CoxHealth - Gastroenterology

3901 S. Fremont Ave. Floor 4Springfield, MO 65804

Saint Lukes Hospital

232 S Woods Mill RdChesterfield, MO 63017

Gateway Gastroenterology

121 Saint Lukes Center Dr Ste 406Chesterfield, MO 63017
Mon8:00 am - 4:00 pm
Tue8:00 am - 4:00 pm
Wed8:00 am - 4:00 pm
Thu8:00 am - 4:00 pm
Fri8:00 am - 4:00 pm
SatClosed
SunClosed

Saint Louis Multispecialty Surgery Center

884 Woods Mill Rd Ste 100Ballwin, MO 63011
Mon7:30 am - 5:00 pm
Tue7:30 am - 5:00 pm
Wed7:30 am - 5:00 pm
Thu7:30 am - 5:00 pm
Fri7:30 am - 5:00 pm
SatClosed
SunClosed

Saint Lukes Hospital

232 S Woods Mill Rd Ste 330EChesterfield, MO 63017

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Dr. Jason Martin Haas, DOShauna Sanderson, APRNRebecca Humphries, APRNAshley Anderson, APRN
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.2 
18 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available Virtual Visit Available
Speaks English Speaks English Speaks English Speaks English
Springfield , MOTallahassee , FLSacramento , CASacramento , CA
Med School: A T Still University Kirksville College Of Osteopathic Medicine Med School: Creighton University College of Nursing Med School: Emory University Med School: East Tennessee State University - Quillen College of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Jason Martin Haas

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. Jason Martin Haas has the following 2 specialties

Specialty Expertise

Dr. Jason Martin Haas has the following 9 areas of expertise

  • Abdominal Pain
  • Acid Reflux Disease (GERD)
  • Celiac Disease
  • Colonoscopy
  • Constipation
  • Hemorrhoids
  • Internal Medicine
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Certifications, License, & Education

18 Years Experience

Dr. Jason Martin Haas holds an expired medical license in the state of Missouri.

Medical License

Doctor Of Osteopathy with an expired medical license in the state of Missouri that expired in 2026.

Education & Training

Medical School

Graduated from A T Still University Kirksville College Of Osteopathic Medicine in 2008.

NPI Number

Dr. Haas' NPI number is 1790948008.

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Frequently Asked Questions

Where is Dr. Jason Haas's office located?
Dr. Jason Haas's office is located at 3901 S. Fremont Ave. Floor 4, Springfield, MO, 65804.
How can I make an appointment with Dr. Jason Haas?
You can find contact information for Dr. Jason Haas here on Vitals.
What languages does Dr. Jason Haas speak?
Dr. Jason Haas speaks English.
Which hospitals is Dr. Jason Haas affiliated with?
Dr. Jason Haas is affiliated with Coxhealth Medical Center South, MEYER ORTHOPEDIC AND REHABILITATION HOSPITAL, and SAINT LUKES HOSPITAL.
Does Dr. Jason Haas accept my insurance?
You can see the insurance plans that Dr. Jason Haas accepts on their Vitals profile.

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