The SIG office remains open during the COVID-19 pandemic.
SIG is providing telemedicine services in lieu of in-office visits. Call the office for details.
Read More »

Patients can Trust Over 100 Years Experience

Specialists in Gastroenterology is a well-established G.I. group located in an unique modern facility in Saint Louis, Missouri. This single-specialty medical group provides sensitive, reliable patient care to patients with gastrointestinal illnesses. The group diagnoses and treats challenging clinical G.I. problems and has expertise in diagnostic and therapeutic endoscopy procedures of the gastrointestinal tract. SIG emphasizes the use of innovative new technology coupled with compassionate patient care. Patients can trust the 100 years of combined clinical expertise and their passion for practicing medicine. SIG is actively engaged in clinical research and teaching at Washington University and Barnes-Jewish Hospital.

Aman Singh, M.D., Janet Erik Thyssen, M.D., Leonard Weinstock, M.D., David Van Hoornbeek, PA-C, Steven Fern, D.O.

From left to right: Steven Fern, D.O., Leonard Weinstock, M.D., Aman Singh, M.D., David Van Hoornbeek, PA-C, Erik Thyssen, M.D., Nikhil Banerjee, M.D., Kimberly Birenbaum, PA-C.

Not pictured: Jennifer Gorham, PA-C


Read what our patients are saying about Specialists in Gastroenterology.

Read Our


Visit our patient center
for access to online
forms, education,
and office policies.

Patient Center

Connect with your doctor through a
secure patient portal.

I need the enrollment number.

Login to NextMD

Recent News