Our Doctors

Thomas M. DeWeert, M.D.

Philip M. Koszyk, M.D.

Kenneth R. Schoenig, M.D.

Vijaya Misra, M.D.

Robert E. Clark, M.D.




Medical Office

Main Office:
1302 Franklin Avenue, Suite 4800
Normal, Illinois 61761

Advocate Eureka Hospital:
101 S. Major Street
Eureka, Illinois 61530

Dr. John Warner Hospital:
422 W. White Street
Clinton, Illinois 61727

Please dial 911 or go to your nearest emergency room.

Phone: (309) 454-5900
After Hours: (309) 823-0300
Fax: (309) 454-2820

Hours: Monday through Friday from 8:30 a.m. to 5:00 p.m.

About Us

Our Mission:

Digestive Disease Consultants offers patients and their referring physicians in the Central Illinois area the highest quality in state-of-the-art care for digestive and liver disorders in a comfortable, safe, and efficient environment. We provide specialized care using the latest in technology with a team of highly skilled and board-certified doctors, dedicated nurses and courteous staff to facilitate your medical care.

Appointments Available:

Monday through Friday with free valet parking.

The office is open Monday through Friday from 8:30 a.m. to 5:00 p.m. Our physicians are available for emergencies 24 hours a day; 7 days a week.

What To Bring To Your Appointment:

For your visit, please bring your insurance card(s), photo ID and a list of your current medications.

Please call insurance company prior to appointment to make sure physician/facility is in network with your insurance plan.  If your insurance plan requires a written referral form please bring the form to your appointment and give it to our receptionist when you arrive. If you are unsure as to whether or not you need a referral form, please call the member services number on your insurance card.

Co-payments and balances are collected at the time of service. We accept cash, personal checks or VISA/Mastercard.

New Patients:

Please arrive about 15 minutes early for your first visit. It is necessary for you to complete patient forms prior to seeing your doctor. If you have lab work or recent x-rays relevant to your visit, please bring them as well. For your convenience,  forms are available for download on our Patient Forms page.

When You Have Questions:

We realize you may have questions in between scheduled visits. Our office staff will relay questions to our nurses and physicians, as needed, and get back with you promptly. During office hours, our registered nurses will forward information concerning medical emergencies to our physicians. After hours and on weekends, the "on-call" physician can be reached through the answering service by calling (309) 823-0300.

Payment Information:

Digestive Disease Consultants participates in more major health plans.  Please call your insurance company prior to appointment.  See more information on our insurance page. Our acceptance of a specific health plan is subject to change. Our email address for billing questions is This e-mail address is being protected from spambots. You need JavaScript enabled to view it .


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