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 (2)

The overall average patient rating of Dr. John Kniaz is Good. Dr. Kniaz has been reviewed by 3 patients who have provided 2 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 4.3
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.3

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.


Dr. Kniaz has 20 hospital affiliations:

  • St. Catherine Hospital 
  • Illiana Surgery & Medical Center Llc 


  • English

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Additional Information
Dr. John Kniaz DO is a male Internist, has 39 years of experience and practices in Gastroenterology.
Where does Dr. John Kniaz practice?
Dr. John Kniaz has 7 office locations.
Dr. John Kniaz practices Gastroenterology near Munster, IN.
Additional practice locations include: Saint John, IN and Dyer, IN.
See Munster Gastroenterologists.