Dr. John Kniaz, DO


Gastroenterology | Male

Dr. John Kniaz, DO
Dr. John Kniaz, DO is a gastroenterology doctor who practices in Munster, IN. He is 71 years old and has been practicing for 45 years. Dr. Kniaz is affiliated with Franciscan Health Hammond, Franciscan Health Crown Point, Franciscan Healthcare Munster, Community Hospital and St. Catherine Hospital.

Learn about this doctor

Dr. Kniaz's Experience

Experience Match

See how Dr. Kniaz's experience matches your preferences.


For the best healthcare for your needs, choose a doctor who specializes in your medical condition.

Conditions Treated

Check to see that this provider treats your medical condition.

Procedures Performed

Check to see that this provider performs the procedure that you need.

Background Check

Check to see if your provider has any malpractices, board actions, or sanctions.


Learn more about where this provider went to medical school, residency, and more.

Languages Spoken

Check to see what languages this provider and/or staff speak.

Memberships & Professional Affiliations

View memberships and affiliations associated with this provider.

Visiting Dr. Kniaz

Dr. Kniaz accepts 7 insurance carriers

Dr. Kniaz is now accepting new patients

Affiliated Hospitals

Hospital Quality
Check out the quality of care at the 5 hospitals where Dr. Kniaz has admitting privileges.

Dr. Kniaz's Reviews

Likelihood of recommending Dr. Kniaz to family and friends
based on 27 total reviews (9 with comments)
Dr. Kniaz's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    16 to 30 minutes
Patient Comments (9)
in Whiting, IN |
First of all the office is very dirty and when I went to check in I waited for someone to help me for 15 mins and they finally came to the window talking with food in her mouth, when I got into the room the nurse took my vitals ask why I was here and left the room then another nurse came in and I ask to speak to the nurse who was just here and she said oh she isn't a nurse she is a medical assistant then why did she say she was a nurse? they were rude. The doctor was horrible and rude. Bad place
in Melrose Park, IL |
This dr saw my mom at St. Margaret Hospital, Dyer, IN. He had involment in an order for her peg tube for gastric feeding. one day after the surgery, I witnessed a massive bleed from the gastric tube site. He and/or his selected gastro surgical dr. performed a botched surgery. My mom lost much blood that she needed a blood transfusion. I do not recall every seeing him again after the surgery . I see him as a very negligent doctor who pose a risk to patients in need of gastric neutrician.
in Dyer, IN |
My mother saw this Dr. Kniaz 2 months ago she has very bad constipation he told her to eat more fiber and drink more water, well he doesn't know what the heck he is talking about she ended up very sick I took her to a Dr Kumar who was wonderful found her problem and she is doing great, maybe this Dr Kniaz guy needs to retire because he has no clue what he is talking about and he is very sarcastic when I questioned him about my mother. Your front people need a class on being polite and nurses.
in Munster, IN |
Went in for a major issue from an ultrasound, he completely ignored it and scheduled a scope down my throat. When I woke up from anasthesia, room full of people (intern nurses?) it was a big joke, "Oh, he's awake, ha ha ha!" So after that, I expected a follow up re: results of that procedure and to address the primary issue for which my PCP sent me to a Gastro, nada. Not a word. I don't know what else to say. Horrible.
in east chicago |
First visit 1 month ago the lady that answered the phone put me on hold 5 times very rude she told me they were short handed then i ask for an appt they put me in with a Dr Kniaz who I did't ask for I ask for Dr Nallapareddy they said he was booked I saw this Doctor and what a rude Ingnornant person he was. The staff was rude, nursing was rude and I wanted to ask a question about the colonoscopy they told me to go talk to the scheduler she had no clue what she was doing either I cx everything.
in Merrillville, IN |
Terrible Doctor. When I woke up from my colonoscopy he said "it's just IBS. Eat more fiber." Then he walked out. After he left, I told the nurse that eating more fiber upsets my stomach, so she told me I shouldn't. He didn't even suggest further testing or meds and instead told me to take Benefiber which did nothing. I could tell he didn't take me seriously. I had to suffer for another two years until I switched to a doctor that actually took my concerns seriously.
in Munster, IN |
Dr. Kniaz will take whatever time his patient requires to answer all questions and really cares about his patients. He's on his 3rd generation of patients in my family.
in merrilliville in |
He is the worst doctor i have ever seen I would not have a dead dog see him. The office staff is rude and the medical asisstants are dumb they ask me questions then a nurse ask me the same and said nothing was charted from the asisstant . The office is a filthy place, no tv for my son to warch while i was being seem by this rude doctor.. I would never recommend any of these doctors to anyone.
in Hammond |
Worst doctor ever! I had h pylori and I went to see him in July and he kept sending me away saying I was just probably stressed or it was my diet.I got so sick and ended up loosing 30lbs.I finally demanded a endoscopy and they saw h pylori,gastritis and gerd! I was sick for 6 months before he would take me serious!I now have a lump on my right side and I've asked him to check it out and he completely ignored me! Will never step a foot in his office again! Also plan on waiting 2 hours to be seen!
Have you seen Dr. John Kniaz, DO?
Are you Dr. Kniaz?
Make it easy for patients to share their feedback. Also manage your personalized profile!

Compare Dr. Kniaz

Compare this Doctor
View other doctors with similar experience to find the right doctor for you.
View all 10 matches

Dr. Kniaz's experience matches your search based on the following criteria:

  •  Based on total number of patients treated over the last 12 months
  •  Specializes in Gastroenterology
  •  No board certification on record with Healthgrades
  •  Malpractice claims in Indiana not available
  •  No sanctions found
  •  No board actions found

Background Check

  • n/a
    Malpractice Claims not available

    Healthgrades does not collect malpractice information for Indiana.

    What is medical malpractice
  • 0

    No sanctions history found for the years that Healthgrades collects data.

    What is a sanction or disciplinary action
  • 0
    Board Actions

    No board actions found for the years that Healthgrades collects data.

    What are board actions

Conditions Treated

  • Abdominal Disorders
  • Abdominal Pain
  • Abscess
  • All Types of Food Poisoning
  • Anemia
  • Autoimmune Diseases
  • Barrett's Esophagus
  • Benign Neoplasm of the Digestive System
  • Benign Tumor
  • Biliary Atresia
  • Blood Disorders
  • Cancer
  • Cholecystitis and Gallstones
  • Cirrhosis
  • Colorectal Cancer
  • Constipation
  • Crohn's Disease
  • Dehydration
  • Diaphragmatic and-or Hiatal Hernia
  • Diarrhea
  • Diverticulitis, Intestinal
  • Diverticulosis, Intestinal
  • Duodenal Ulcer
  • Duodenitis
  • Dysentery
  • Dysphagia
  • Enteritis
  • Esophageal Achalasia and Cardiospasm
  • Esophageal Cancer
  • Esophageal Diseases
  • Esophageal Diverticulum
  • Esophageal Ulcer
  • Esophageal Varices
  • Esophagitis
  • Food Poisoning
  • Gas-Bloat Syndrome
  • Gastric Ulcer
  • Gastritis
  • Gastroesophageal Reflux Disease (GERD)
  • Gastrointestinal Bleeding
  • Gastrointestinal Diseases
  • Gastrointestinal Malabsorption
  • Gastrojejunal Ulcer
  • Gastroparesis
  • Heartburn
  • Hemochromatosis
  • Hemorrhoids
  • Hepatitis A
  • Hepatitis B - Immune Response
  • Hepatitis C
  • Hernia
  • Ileus
  • Indigestion
  • Inflammatory Bowel Disease
  • Intestinal Obstruction
  • Irritable Bowel Syndrome
  • Lactose Intolerance
  • Liver Damage from Alcohol
  • Malnutrition
  • Nausea
  • Neoplasm of Gastrointestinal Tract
  • Non-Alcoholic Fatty Liver Disease
  • Non-Neonatal Jaundice
  • Noninfectious Gastroenteritis and Colitis
  • Pancreatitis
  • Peptic Ulcer
  • Pyloric Stenosis
  • Reflux Esophagitis
  • Stomach Cancer
  • Stomach Diseases
  • Stomach and Small Intestine Cancer
  • Ulcer
  • Ulcerative Colitis
  • Unexplained Weight Loss
  • Vascular Insufficiency of Intestines
  • Viral Hepatitis
  • Viral Infection
  • Vomiting Disorders


  • Medical School
    Philadelphia College Of Osteopathic Med

    Graduated in 1972

Languages Spoken

  • English

Memberships &
Professional Affiliations

Dr. Kniaz does not have any memberships or affiliations listed. If you are Dr. Kniaz and would like to add memberships or affiliations, please update your free profile.


  • Gastroenterology

Procedures Performed

  • Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
  • Endoscopy (Esophagus, Stomach, Small Intestine)
  • Fecal Impaction Removal
  • Gastroenterology Procedures
  • Hemorrhoidectomy or Excision of Anal Tags
  • Incision and Removal of Foreign Object
  • Liver Biopsy