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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).

Learn more about Dr. John Siegfried:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. John Siegfried is Excellent. Dr. Siegfried has been reviewed by 3 patients who have provided 1 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.0
Promptness 3.7
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. John Siegfried, MD is board certified in Gastroenterology.

  • He has special expertise in 6 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Crohn`s disease Hemorrhoid treatment Ulcers-general Age 16 Hiatal hernia Hepatitis Abdominalcolorectal cancer
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Siegfried graduated from University of Illinois at Chicago.


Dr. Siegfried has 12 hospital affiliations:

  • Edward Hospital 
  • Provena Mercy Medical Center 


  • French
  • English

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Additional Information
Dr. John David Siegfried MD is a male Internist, has 37 years of experience and practices in Gastroenterology.
Where does Dr. John D. Siegfried practice?
Dr. John Siegfried has 1 office location.
Dr. John Siegfried practices Gastroenterology near Aurora, IL.
See Aurora Gastroenterologists.