Dr. John Leonard Kniaz, DO

This doctor is extra rude and insulting.He told me I wasn’t sick for 6 months and I lost 47lbs in the process .. I demanded he do a endoscopy and he told me “I’ll do it but we’re not going to find anything” I went in and had it done and they found h pylori,esphogatis,and gastritis.My bp and iron were fatally low.I ended up being hospitalized for a week after my experience with him.Im still trying to get my weight and iron back up after seeing him 4 yrs ago.Please don’t waste your time and money seeing this man.I have never met a doctor so rude in my life.If you need an excellent gi o highly recommend dr Gene Chang in munster.It May take you a few months to get it but I’m telling you he’s worth it.

I have been a patient of Dr Kniaz for approx. 10 yrs. He successfully treated my HepC and I have referred him to other friends and relatives for their internal problems. I trust him with my life and others have also. He is one of the most kind, observant, caring, and knowledgeable doctors in his field. I can not say enough good about the man.

I found the doctor ans staff to be very courteous and helpful. I was able to get my appt and add'l testing done with a very reasonable amount of time. I would recommend him to anyone.

I saw Dr. Kniaz after being referred by my primary physician. I had suffered for two years with what was diagnosed as fatty liver disease. Dr. Kniaz read my medical record, asked me questions and ordered a special test that no other physician had requested. One test and he diagnosed my gallbladder disease. He referred me to a surgeon and I have not had any pain. My son also saw him for gastrointestinal problems. Dr. Kniaz performed a procedure and found holes in his esophagus and disgnosed that he had GERD. With a change in diet, my son has rarely had the same problems, Dr. Kniaz is a wonderful physician and he takes his time with you, He will be performing my colonoscopy and I have total trust in him.