We are seeing patients in the office with CDC guideline recommendations for safety.
Please do not hesitate to call the office to schedule your office appointment.

Contact Us

Specialists in Gastroenterology 

11525 Olde Cabin Road
St. Louis, MO 63141

Phone:  314-997-0554

Fax:  314-997-5086

Office Hours:
Monday - Friday
9:00 AM - 4:30 PM

To contact your physician directly, use NextMD for secure messenging.

View Our Locations Page / View Map & Directions



Doctors at Specialists in Gastroenterology

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


View our frequently asked questions.

Pre-registration Telephone Numbers

Call one day before the procedure

How are we doing?

Please take a moment to tell us how we are doing by filling out the patient satisfaction survey.

Telephone Calls

Routine telephone calls should be made between 9:00 AM and 4:45 PM Monday through Friday. Emergency telephone calls after office hours should be directed to the exchange (314) 388-6578. True medical emergencies that can not wait should prompt a 911 call. Return telephone calls by physicians will be made throughout the course of the day – please tell us how long you will be at your telephone number and how urgent the problem is. We perform endoscopic procedures most mornings and return calls in between cases or at the end of the work day for elective calls.

You may also use NextMD if this is not an emergency.