Gastroenterology
HRRMC employs three board-certified surgeons and contracts with additional board-certified, fellowship-trained gastroenterologists that all provide gastrointestinal endoscopy procedures.

Our team of general surgeons - Karen Johnson, M.D., Jeremy Hedges, M.D., Zachary Green, M.D. and Stefan Iverson, D.O. - have offices at the hospital's main campus in Salida, performing many types of gastroenterology and surgical procedures at HRRMC.
HRRMC's gastroenterology nurse practitioner Marion Toll, NP-C sees patients in our clinic.
Other procedural services are supported by Associates in Gastroenterology (AG) of Colorado Springs. AG's fellowship-trained gastroenterologists perform procedures at the hospital, but do not see patients in clinic. A referral is required through HRRMC's surgeons or HRRMC's gastroenterology nurse practitioner for these procedures.
What exactly does a GI doctor do?
Here is a brief list of conditions you may be treated for and procedures your physician may suggest.
- Upper Endoscopy/EGD - This is a scope of the upper gastrointestinal tract (i.e. esophagus, stomach and duodenum) to determine the existence of ulcers and other problems.
- Lower Endoscopy/Colonoscopy - This is a scope of the lower gastrointestinal tract (i.e. colon and rectum) to determine if there are precancerous polyps, cancer or inflammatory bowel disease.
- Flexible Sigmoidoscopy - This scope looks at the lower colon and rectum for precancerous polyps and cancer.
- Bernstein/Tensilon Tests - These two tests show the tendency of stomach acid to reflux into the esophagus causing heartburn and pain.
- Gastritis Test - This test indicates if potentially ulcer-causing bacteria are present in the system.
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Barium studies (done in conjunction with the Medical Imaging Department)
- These tests are additional indicators of disease in the gastrointestinal system
To schedule an appointment: (719) 530-2481
Fax: (719) 530-2011
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Stacy Abbott, FNP-C- General Surgical Services, Gastroenterology
- Heart of the Rockies Regional Medical Center - Main Campus
- 719-530-2000
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Michael Burkholz, DO- Gastrointestinal Endoscopy, Gastroenterology
- 719-530-2000
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Matthew Drew, MD- Gastrointestinal Endoscopy, Gastroenterology
- Heart of the Rockies Regional Medical Center - Main Campus
- 719-530-2000
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Austin E. Garza, MD- Gastrointestinal Endoscopy, Gastroenterology (Board Certified)
- Heart of the Rockies Regional Medical Center - Main Campus
- 719-530-2000
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Zachary Green, MD- Gastroenterology, Robotic Assisted Surgery, General Surgical Services, Trauma Surgery, General Surgery
- General Surgery Clinic
- 719-530-2000
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Jeremy Hedges, MD,MPH- Gastrointestinal Endoscopy, Gastroenterology, General Surgical Services, Robotic Assisted Surgery, General Surgery (Board Certified), Trauma Surgery
- General Surgery Clinic
- 719-530-2000
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Stefan S. Iverson, DO- Gastroenterology, Robotic Assisted Surgery, General Surgical Services, General Surgery, Trauma Surgery
- General Surgery Clinic
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Karen Johnson, MD,FACS- Robotic Assisted Surgery, Gastrointestinal Endoscopy, General Surgical Services, Gastroenterology, Vascular, General Surgery (Board Certified), Trauma Surgery
- General Surgery Clinic
- 719-530-2000
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Bryan C. Kavanaugh, MD- Gastrointestinal Endoscopy, Gastroenterology (Board Certified)
- Heart of the Rockies Regional Medical Center - Main Campus
- 719-530-2000
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Marion Toll, NP-C- Gastrointestinal Endoscopy, HRRMC Outpatient Pavilion, Gastroenterology
- Gastroenterology
- 719-530-2000
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Teresa Yanchak, MD- Gastrointestinal Endoscopy, Gastroenterology (Board Certified)
- Heart of the Rockies Regional Medical Center - Main Campus
- 719-530-2000
