5139 Mattis Road, Suite 101
St Louis, MO 63128

(314) 492-4100


Online Appointment Requests


Requests for office appointments only - please call office for procedure requests or for office visit requests earlier than three working days away.

Robert McMahon, MD
Board Certified Gastroenterologist
(314) 492-4100


Staff, Location, Map




Dr Robert McMahon is Board Certified by the American Board of Internal Medicine in both Gastroenterology and Internal Medicine.  He is a MD graduate of Washington University School of Medicine in St Louis and completed internship and residency there (Barnes-Jewish Hospital). 

After completing his Gastroenterology Fellowship at University of Arkansas for Medical Sciences in Little Rock, he remained in private practice in Little Rock for several years before returning to St Louis.  He has continuously practiced gastroenterology in St Louis since then.  He is past President of the St Louis Metropolitan Medical Society and a Fellow of the American College of Gastroenterology (FACG).

This office location is adjacent to an existing ambulatory surgery and endoscopy center (SCOPES) and brings convenience and ease of access to patients for their digestive health needs, including consultations, colonoscopy and endoscopy.  Virtually all insurance plans and Medicare are accepted.  Dr. McMahon has privileges at several hospitals and surgery centers.

Dr. McMahon and staff are committed to providing the highest quality care and personal attention based on experience and education.  We strive for promptness, courtesy and convenience.
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