
Highlights
Age Groups Seen
- Adults
- Geriatrics
Languages
- English
Gender
MaleAbout Norman Shizuaki Nishioka
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
- Massachusetts General Gastroenterology Associates
- 55 Fruit Street, Building 5, Boston, MA 02114
- Get Directions
- phone: 617-726-2426
- fax: 617-724-5997
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
- 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 reviewsThe 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.
- 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