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Norman Shizuaki Nishioka

Norman Shizuaki Nishioka, MD

Gastroenterology

Highlights

Age Groups Seen

  • Adults
  • Geriatrics

Languages

  • English

Gender

Male

About Norman Shizuaki Nishioka

Current Positions:
Director of Endoscopy
Physician, MGH
Associate Professor of Medicine, Harvard Medical School

Education:
AB - University of California, Berkeley
MA - University of California, Berkeley
MD - Geffen School of Medicine at UCLA

Post-Graduate Training:
Residency in Internal Medicine, Massachusetts General Hospital
Fellowship in Gastroenterology, Massachusetts General Hospital

Locations

  1. Massachusetts General Gastroenterology Associates

Expertise

Education

  • Fellowship: Massachusetts General Hospital, Gastroenterology, 1987
  • Internship: Massachusetts General Hospital, Medicine, 1984
  • Residency: Massachusetts General Hospital, Medicine, 1984
  • Medical Education: UCLA School of Medicine, 1981

Board Certifications

  • Gastroenterology: American Board of Internal Medicine, 1987
  • Internal Medicine: American Board of Internal Medicine, 1984

Insurance

This provider may accept more insurance plans than shown. Please call the practice to find out if your plan is accepted.
Search plans
  • Aetna
  • Beech Street
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield Medicare
  • Cigna
  • Commonwealth Care Alliance
  • Coventry
  • Fallon Health
  • Harvard Pilgrim Health Care
  • Humana
  • Maine Community Health Options
  • Mass General Brigham Health Plan
  • MassHealth
  • Medicaid ME
  • Medicaid NH
  • Medicaid RI
  • Medicaid VT
  • Medicare
  • Medicare ACO
  • Multiplan
  • Railroad Medicare
  • Senior Whole Health
  • TriCare
  • Tufts Health Plan
  • Tufts Medicare Preferred
  • United Health Care
  • Wellpoint
  • WellSense
  • WellSense NH

Ratings & Reviews

4.9 out of 5

61 ratings, 30 reviews

The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

How likely would you be to recommend this provider to your family and friends?
Search reviews
  • Reviewed on 2/5/2026

    I've been a patient of Dr Nishioka for 30+ years. I've 7 colonoscopies during that time period. My visit on [redacted] was to discuss my elevated ferritin levels and symptoms. Dr Nishioka was prepared having viewed my test results prior to my visit. Dr Nishioka is amazing. I'm blessed to be in his care. [redacted]

  • Reviewed on 2/4/2026

    Dr. Nishioka is a wonderful doctor. He is a true professional and treats me with respect. He listens very carefully to me and I would recommend him to anyone who needs a doctor in his field.

  • Reviewed on 1/3/2026

    I felt validated and heard. Which was so important. We are still following up. And I'm hoping to hear from him soon but my initial experience with this provider could not have been better. He was great, well educated, and easy to communicate with.

  • Reviewed on 12/24/2025

    Excellent

  • Reviewed on 12/24/2025

    Dr Nishioka is excellent, caring, and listens to me. He's the best. I'm very grateful to have him As my doc!

  • Reviewed on 11/20/2025

    excellet care

  • Reviewed on 11/16/2025

    Dr. Nishioka was warm, kind, and understanding regarding my concerns about how the colonoscopy prep and procedure might affect my other health issues. He assured me that one of my concerns wasn't an issue and that the others could be (and often are) managed. He did so in a gentle, good-humored, and wise way that makes such a difference in the experience of patients.

  • Reviewed on 10/16/2025

    First time we met him and he was caring, a good listener and seemed open to our complicated case.

  • Reviewed on 10/1/2025

    I was very satisfied

  • Reviewed on 9/27/2025

    Dr. Nishioka, He is a wonderful doctor that has a very appreciated kind bed side manner.

  • Reviewed on 9/17/2025

    Dr Nishioka is a caring, knowledgeable, and kind physician who provides excellent care to his patients. Outstanding demeanor and always willing to discuss issues. I am always at ease when requiring a visit with him.

  • Reviewed on 9/18/2025

    The Dr has always been great with me and my family that's why we always return to his practice.

  • Reviewed on 9/17/2025

    Dr Nishioka always makes me feel that he has as much time as I need to deal with my issue. He has a way of putting me at ease and relieving anxiety which, of course, contributes to healing.

  • Reviewed on 9/15/2025

    He did not pretend to know everything, as is sometimes the case, yet he very clearly knows his subject.

  • Reviewed on 9/10/2025

    Dr Nishioka is an excellent physician. My 2 family members who are doctors and were present - agree!

  • Reviewed on 8/15/2025

    The care provided was excellent. It gave me, explained me everything that I need to know about my condition and he was very professional and excellent overall.

  • Reviewed on 8/13/2025

    Both the doctor and the nurse were courteous, professional in timely in the treatment.

  • Reviewed on 8/13/2025

    Excellent

  • Reviewed on 8/5/2025

    Dr. Nishioka is caring, compassionate, competent, friendly, and respectful. I really enjoy our interactions and look forward to them (albeit, unfortunate that I have medical issues, of course). I'm grateful to have Dr. Nishioka as a care provider.

  • Reviewed on 8/1/2025

    Yeah, this, Dr. Nishioka, this provider has always gone over and above to answer every single question that I have had. And he has always been very kind and flexible and very, very nice. I cannot say enough good things about him. Thank you.

  • Reviewed on 7/24/2025

    Provider is excellent but this was my first experience so only one point of reference.

  • Reviewed on 6/17/2025

    Great, caring, knowledgeable doctor!

  • Reviewed on 6/19/2025

    Dr. Nishioka is always responsive, helpful and kind.

  • Reviewed on 6/12/2025

    This was a consultation and all my questions were answered.

  • Reviewed on 6/11/2025

    Dr. Nishioka is a great doctor. He is intelligent, personable and compassionate.

  • Reviewed on 6/11/2025

    Dr. Nishioka is an amazing physician who listens to your concerns and addresses them in a clear and understandable manner.

  • Reviewed on 5/20/2025

    Excellent knowledge and very good manner of discussion.

  • Reviewed on 5/2/2025

    Kind and thoughtful manner

  • Reviewed on 4/7/2025

    So glad I have this Doctor to oversee my health needs.

  • Reviewed on 3/31/2025

    Excellent doctor