Browse Health
Gastroenterologist (digestive)
40 years of experience
Accepting new patients
Video profile
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. John Kniaz is Excellent. Dr. Kniaz has been reviewed by 9 patients who have provided 3 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.8
Promptness 4.3
Courteous Staff 4.8
Accurate Diagnosis 4.8
Bedside Manner 4.8
Spends Time with Me 4.8
Follows Up After Visit 4.7

Specialties & Research

  • He has special expertise in 7 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Colonoscopy
  • Constipation
  • Gastroscopy
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Kniaz graduated from Philadelphia College of Osteopathic Medicine. He has 2 awards.

Patients' Choice Award (2015)
On-Time Doctor Award (2015)


Dr. Kniaz has 20 hospital affiliations:

  • Illiana Surgery & Medical Center Llc 
  • Community Hospital 


  • English

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Additional Information
Dr. John Kniaz DO is a male Internist, has 40 years of experience and practices in Gastroenterology.
Where does Dr. John Kniaz practice?
Dr. John Kniaz has 1 office location.
Dr. John Kniaz practices Gastroenterology near Munster, IN.
See Munster Gastroenterologists.