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. Gregory Nelligan:

View the full profile to get information on:

  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. Gregory Nelligan is Excellent. Dr. Nelligan has been reviewed by 1 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 5.0
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. Gregory Nelligan, MD is board certified in Internal Medicine and Gastroenterology.

  • He has special expertise in 5 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Nelligan graduated from University of Illinois at Chicago.


Dr. Nelligan has 1 hospital affiliations:

  • William S. Middleton Memorial Veterans Hospital 

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Additional Information
Dr. Gregory Keith Nelligan MD is a male Internist, has 28 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. Gregory K. Nelligan practice?
Dr. Gregory Nelligan has 3 office locations.
Dr. Gregory Nelligan practices Internal Medicine and Gastroenterology near Belvidere, IL.
Additional practice locations include: Madison, WI and Rockford, IL.
See Belvidere Internists and Belvidere Gastroenterologists.