
Highlights
Age Groups Seen
- Adults
- Geriatrics
Languages
- English
Gender
MaleLocations
- Massachusetts General Gastroenterology Associates
- 55 Fruit Street, Building 5, Boston, MA 02114
- Get Directions
- phone: 617-726-2426
- fax: 617-724-5997
- Massachusetts General Gastroenterology Clinic
- 104 Endicott Street, Medical Office Building, Danvers, MA 01923
- Get Directions
- phone: 978-882-6709
- fax: 978-882-6710
Expertise
Education
- Fellowship: Mount Sinai Hospital Medical Center, Hepatology, 1994
- Fellowship: St. Luke's Roosevelt Hospital Center, Gastroenterology, 1993
- Residency: St. Luke's Roosevelt Hospital Center, Internal Medicine, 1991
- Medical Education: Renaissance School of Medicine at Stony Brook University***, 1988
Board Certifications
- Gastroenterology: American Board of Internal Medicine, 1995
Insurance
- Aetna
- Beech Street
- Blue Cross Blue Shield
- Blue Cross Blue Shield - Indemnity
- Blue Cross Blue Shield Medicare
- Blue Cross Blue Shield NH
- 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
- Medicare
- Medicare ACO
- Multiplan
- Railroad Medicare
- Senior Whole Health
- TriCare
- Tufts Health Plan
- Tufts Medicare Preferred
- Tufts Public Health Plan
- United Health Care
- Wellpoint
- WellSense
- WellSense NH
Ratings & Reviews
4.8 out of 5
138 ratings, 43 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 2/6/2026
Hi, Dr. Thiim was very good. He spent all the time I needed with him, went over the whole scan that I was given. And yeah, he was great.
- Reviewed on 2/5/2026
Dr. Thiim was knowledgeable, professional and friendly. I would highly recommend him to friends and family.
- Reviewed on 1/30/2026
Dr. Thiim is the best!
- Reviewed on 1/21/2026
Dr. Thiim is extremely helpful in interpreting my blood tests, MRI, and ultrasound so I can understand what the results indicate and their implications for future monitoring.
- Reviewed on 12/25/2025
Excellent .
- Reviewed on 12/24/2025
Very knowledgeable, caring and to the point...
- Reviewed on 12/24/2025
He was calm respectful I never felt rushed. I was very comfortable to be upfront with issues and concerns and he discussed all. Very thorough
- Reviewed on 12/21/2025
Courteous and attentive.
- Reviewed on 12/16/2025
Excellent doctor. Engaging and informative
- Reviewed on 12/16/2025
Great experience.
- Reviewed on 12/16/2025
I have been with Dr Thiim for 15 years. He is a wonderful doctor who always puts me at ease.
- Reviewed on 12/4/2025
Appointment was on time, covered all necessary questions and/or issues, and Dr. Thiim explained my health issue and treatment in a clear and concise manner. He is a true gentleman and professional and I would recommend him to my family and friends should they need a gastroenterologist.
- Reviewed on 11/26/2025
I was treated with the upmost dignity and respect.
- Reviewed on 11/21/2025
Dr. Thiim is absolutely wonderful and I would recommend him to anyone.
- Reviewed on 11/20/2025
I appreciate Dr. Thiim's knowledge and comforting and pleasant manner.
- Reviewed on 11/5/2025
I am very happy with my experience with Dr. Thiim. He was very attentive and explained everything to me in detail. He took his time to address any questions and/or concerns I had.
- Reviewed on 10/23/2025
Dr. Thiim always makes time to listen and respects my opinions.
- Reviewed on 10/3/2025
I've been going to Dr. Thiim for probably 20 years plus for my autoimmune hepatitis, and I would not ever have wanted anybody but him. He's compassionate. He listens. He's wonderful. I love him, and I would not stop going unless he left, which I'd be very sad.
- Reviewed on 9/30/2025
Dr Thiim was extremely thorough and educational.
- Reviewed on 9/24/2025
Always listens carefully and offers reasonable advice and suggestions.
- Reviewed on 9/19/2025
I had a good visit. Although this was my first time seeing Dr. Thiim he was aware of my medical issues and he seemed to be engaged with our conversation.
- Reviewed on 9/7/2025
I find Dr. Thiim to be open, kind, knowledgeable and easy to talk to. He hears me and responds right away, in a realistic manner. I trust him and I like him.
- Reviewed on 9/5/2025
Great Doctor, Nurses, everyone was great!
- Reviewed on 8/14/2025
Professionalism, courteous, respectful, and helpful. While being the expert, did make themselves seem above you in anyway. Listened attentively and sincerely to what I had to say.
- Reviewed on 7/24/2025
Dr Thiim is an exceptional doctor and human being.
- Reviewed on 7/24/2025
He's fantastic!
- Reviewed on 7/17/2025
He's fantastic. So personable, great sense of humor, takes matters seriously but is realistic with expectations/outcomes. Hunted down colleagues during my visit to get timely information and plan of action. Love him!
- Reviewed on 7/9/2025
Dr Thiim was very thorough.
- Reviewed on 7/3/2025
Thisvisit and the previous visits with Dr. Thiim have all been exceptional. He is a talented diagnostician that is able to explain the medical situation in terms that are understand by the patient and outline a plan of action. He welcomes questions and is very also personable and professional. I feel very fortunate to have been referred to Dr Thiim.
- Reviewed on 6/18/2025
Doctor Michael Thiim is the ultimate professional and is expert in all that he does. My condition is not simple and Doctor Thiim has taken this on as a challenge so that it is not simply an idiopathic diagnosis.
- Reviewed on 6/13/2025
Dr. Thiim has been my doctor for many years, and it is a privilege to know him and to have him as my gastroenterologist. He's a wonderful, wonderful doctor, and I am very grateful to have him, and Mass General should be very grateful to have him on their staff.
- Reviewed on 6/12/2025
He makes me feel that all my questions and concerns are important.
- Reviewed on 5/28/2025
Dr Thiim has a tremendous bed side manner. He is respectful and sensitive to my needs. I am fortunate that he is my physician
- Reviewed on 5/21/2025
Dr. Thiim seems to really care about my health
- Reviewed on 5/21/2025
Dc Michael Thiim is the best.
- Reviewed on 5/15/2025
I feel very fortunate to have a wonderful Dr. like Dr.Thiim. He is always pleasant and answers all my questions.
- Reviewed on 4/22/2025
Very knowledgeable and listens to your concerns.
- Reviewed on 4/23/2025
My entire experience with Dr. Thiim has been outstanding.
- Reviewed on 4/17/2025
I was comfortable and pleased with the experience. Dr. Thiim was very thorough.
- Reviewed on 4/14/2025
Remembered me from previous visit in 2016. Listened intently to what my concerns were and answered.
- Reviewed on 4/9/2025
The doctor was very thorough, he knew what he was talking about, he knew everything about me. He had records dating back years ago, years and years ago. So he knows all about me, he knows everything, all my history. He's very up to date with me, so I feel comfortable. The guy seems like he knows what he's doing, and I think he's good. And the guy I had before was Dr. [redacted] which was the best. I mean, I liked that guy a lot, he was the best. Treated me unbelievable. This guy, he is right behind him. Same thing. Very good. Thank you.
- Reviewed on 4/9/2025
Yes, Dr. Thiim is just the best doctor. I've seen him for a long time and I really appreciated him. He is really great. Thank you.
- Reviewed on 4/7/2025
Dr Thiim is most excellent. With a nursing background, I have a decent grasp of my conditions and the attendant implications. Dr Thiim was very thorough and addressed all my concerns with much care and kindness. He is much appreciated for his thoroughness and thoughtfulness.