
Highlights
Age Groups Seen
- Pediatrics
- Teenagers
- Adults
- Geriatrics
Languages
- English
Gender
MaleLocations
- Mass General Brigham Primary Care Clinic
- 969 Main Street, St 205, Millis, MA 02054
- Get Directions
- phone: 508-376-3000
- fax: 508-376-6064
Expertise
Education
- Residency: UMass Chan Medical School, Family Medicine and Community Health, Worcester Residency Program, 2009
- Internship: UMass Chan Medical School, Family Medicine and Community Health, Worcester Residency Program, 2007
- Medical Education: Mount Sinai School of Medicine, 2006
Board Certifications
- Family Medicine: American Board of Family Medicine, 2009
Insurance
- Aetna
- Blue Cross Blue Shield
- Cigna
- Coventry
- Harvard Pilgrim Health Care
- Mass General Brigham Health Plan
- MassHealth
- MassHealth ACO
- Medicare
- Medicare ACO
- Multiplan
- Railroad Medicare
- Tufts Health Plan
- Tufts Medicare Preferred
- United Health Care
- Wellpoint
Ratings & Reviews
4.8 out of 5
230 ratings, 80 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 2/8/2026
I had bloodwork done and everyone was veryyyyyy nice.
- Reviewed on 2/4/2026
Professional
- Reviewed on 1/29/2026
Doctor has a great bed side manner
- Reviewed on 1/26/2026
I was very satisfied by the level of care
- Reviewed on 1/25/2026
Very considerate and attentive.
- Reviewed on 1/17/2026
Dr Marks was incredibly kind and caring. He listened to all of my concerns and provided thoughtful treatment plans.
- Reviewed on 1/10/2026
Dr. Mark is wonderful - personable, thorough, knowledgeable.
- Reviewed on 1/9/2026
Excellent provider.
- Reviewed on 12/28/2025
I'm very satisfied with my primary care doctor.
- Reviewed on 12/22/2025
The Dr was engaged and attentive to what I had to say.
- Reviewed on 12/21/2025
Dr Mark is very good. He listens and talks to you like a professional. I'm glad I found Dr Mark as my PCP
- Reviewed on 12/15/2025
I am a new patient and the office was very welcoming.
- Reviewed on 12/14/2025
Very pleased
- Reviewed on 12/14/2025
Very professional and told what progress we had
- Reviewed on 12/11/2025
Dr mark makes you comfortable to talk about any and all things.very happy with my interactions with him
- Reviewed on 12/8/2025
Whole staff and everybody were very polite answered all my questions highly recommend them
- Reviewed on 12/11/2025
Everything was fine. It was my first time seeing them. Everything was good.
- Reviewed on 12/7/2025
This was a first appt with a new PCP, a "getting to know you" visit for both of us. I felt that it went very well, and that Dr. Mark will be a very good choice to be my PCP.
- Reviewed on 12/1/2025
It was first appointment. Dr. Mark seemed to have a good understanding of my needs and he responded appropriately.
- Reviewed on 12/1/2025
Very happy with this office and Doctor.
- Reviewed on 11/30/2025
Dr Seamus was very sensitive, thorough, knowledgeable, and caring. First time seeing him. He put me at ease and was very pleased with the visit
- Reviewed on 12/1/2025
Excellent care
- Reviewed on 11/25/2025
I do not like change after being with a provider after 40 years. Dr. Mark made me feel at ease! I like him very much and the staff
- Reviewed on 11/17/2025
Wonderful experience. Booking an appointment was easy and everyone was pleasant and easy to work with. Dr. Mark is very courteous and patient.
- Reviewed on 11/17/2025
Always a pleasant experience with Dr. Mark and his office, totally conveniently located, always responsive and helpful.
- Reviewed on 11/16/2025
Excellent experience.
- Reviewed on 11/16/2025
Great
- Reviewed on 11/10/2025
Dr. Mark was very patient and really listened to me. He asked lots of questions and was very thorough. Also reviewed all of my test results with me and explained those that I did not understand.
- Reviewed on 11/7/2025
First visit and very pleased, feel safe with his guidance
- Reviewed on 11/4/2025
Friendly and interested in what I have to say
- Reviewed on 11/2/2025
Dr Mark was very thorough and knowledgeable. He really took the time to go over my medical history. I felt listened to and not at all rushed. He also has a very kind personality. I felt comfortable with him right away. I was very pleased with my visit
- Reviewed on 11/2/2025
It was our first visit with our new doctor, Dr. Mark. Very impressed with his knowledge and thoroughness. His listened intently and answered all my questions. I feel comfortable with him as our new primary doctor.
- Reviewed on 10/26/2025
This was my new PCP, this was a meet and great. Very please with our meeting.
- Reviewed on 10/26/2025
Excellent care all around. Greatly appreciated.
- Reviewed on 10/15/2025
Excellent doctor and support staff
- Reviewed on 10/11/2025
Very positive impression.
- Reviewed on 10/11/2025
Excellent first experience with Dr Mark. Made me feel very comfortable and made it easy to communicate my concerns
- Reviewed on 10/6/2025
Good experience with knowledgeable information
- Reviewed on 9/29/2025
This provider never looked at me once as I was attempting to explain there are medical I would like to discuss- But he did a great hod checking the box and told me we can talk about my issues after filing out the survey Problem was - when we finished the survey -doctor wished me luck and left
- Reviewed on 9/24/2025
I like Dr Mark a lot. He is always kind and nice. He also explains things clearly.
- Reviewed on 9/21/2025
This was my first visit with Dr Mark, he was very professional, personable, gave me time to ask questions. I enjoyed my visit with Dr Mark , it was a good experience.
- Reviewed on 9/15/2025
Yes, Dr. Mark is always very professional, very thorough, and very considerate. All of his staff is quite clearly professional and very friendly. And they're always able to accommodate a need for an emergency medical appointment or something that may be considered serious or definitely needing to have a take a look at. So I've been most grateful to have found Dr. Mark as a new PCP for both my husband and myself after our PCP had retired after being with her practice 32 years. Thank you so much for the excellence that he provides and all of the staff and nursing in his office as well. Thank you.
- Reviewed on 9/10/2025
Dr Mark is fantastic. Listens, cares, great communication, thoughtful and considerate!
- Reviewed on 9/1/2025
Very good !
- Reviewed on 8/28/2025
I greatly appreciated the same day appointment and the care from all. It was a doctor I'd never seen before which is why he didn't know my full medical history in our one appt. [redacted]
- Reviewed on 8/11/2025
First time new doctor I am very happy with everyone
- Reviewed on 8/4/2025
Booked me immediately after hospital visit out of state and dr had all records from hospital before I got there and had already reviewed them, plus Dr is new to me since my previous dr retired
- Reviewed on 8/3/2025
Excellent professional care
- Reviewed on 7/31/2025
This was my first visit and I was very happy with Dr. Mark's treatment of me. He was kind and a very good listener. He also seemed very updated on the new tests that I asked him about.
- Reviewed on 7/15/2025
good visit
- Reviewed on 7/15/2025
This is my first visit. The nursing staff, clerks, and Dr. Mark were very professional. I did not feel rushed: very, very important. I had a very pleasant experience and look forward to a long ongoing relationship.
- Reviewed on 7/15/2025
First vist to this PCP as my last PCP retired in June
- Reviewed on 7/13/2025
I'm a new patient and feel very happy with the situation. Welcoming and kind.
- Reviewed on 7/6/2025
Every interaction I had with the medical/office staff was professional and caring. Dr. Mark was covering for my primary MD and provided excellent care. The office staff were friendly and very helpful.
- Reviewed on 7/4/2025
The front desk, the nurses, and Dr. Seamus Mark are excellent. Wonderful, excellent team. Excellent.
- Reviewed on 6/29/2025
first time seeing this provider and was impressed with Dr Mark
- Reviewed on 6/29/2025
It was my first time meeting Dr. Marks. He was pleasant and courteous but rushed through our session.
- Reviewed on 6/27/2025
Yes, Dr. Mark is thorough in getting the basic measurements that should be looked at. He's concerned about my blood pressure being too low, and I appreciate that. I'm trying to get it up a little bit. [redacted]
- Reviewed on 6/22/2025
Dr. Mark is great!
- Reviewed on 6/22/2025
Nothing else. He was great.
- Reviewed on 6/17/2025
I felt very comfortable talking about some definite unknowns with me. both my intake nurse and Dr Mark were very easy to speak to, and discuss things and they made me feel at ease. Dr Mark comes across very knowledgeable and compassionate. I'm glad that I am switching to him as my pcp.
- Reviewed on 6/18/2025
It was a first new patient visit. I thought Dr. Mark was very nice and look forward to seeing how things go after my first physical with his nurse .
- Reviewed on 6/12/2025
Dr. Mark is a good listener and immediately follows up after my appointments. He responds rapidly on the portal.
- Reviewed on 6/7/2025
Very good Dr.
- Reviewed on 6/7/2025
He's an excellent provider even though he's not a female! Having had female providers for several years, my expectations were different about making the change. I have zero concerns in that regard now.
- Reviewed on 6/12/2025
He was personable, conscientious, and thorough, and followed up very quickly after my blood results were available, and was on top of how to follow up. Very good provider, thank you.
- Reviewed on 6/7/2025
As a new patient, this was my first visit with Dr. Mark and my first impression was very positive. After some bumpy roads these past few years I'm looking forward to some stability with him.
- Reviewed on 6/5/2025
Excellent communication about my needs
- Reviewed on 6/5/2025
Thoughtful & thorough
- Reviewed on 5/26/2025
Professional, courteous and caring.
- Reviewed on 5/18/2025
This was my first appointment with Dr Marks, great experience, he is my new PCP and he was familiar with my medical history. We discussed my care moving forward, this was a positive experience all the way and I'm looking forward to working with him as my doctor. I would highly recommend this practice.
- Reviewed on 5/12/2025
He is a great doctor and working on getting him as a primary
- Reviewed on 5/9/2025
Overall, fantastic experience. Zero complaints
- Reviewed on 5/9/2025
Dr. Mark is a very caring professional who listens to his patients and gives advice about their care.
- Reviewed on 5/2/2025
I appreciated that he took the time to ask questions about my medical history to make sure nothing was missed. He was very nice and welcoming!
- Reviewed on 5/3/2025
A very comfortable experience
- Reviewed on 4/21/2025
Everyone was courteous and professional.
- Reviewed on 4/14/2025
Dr Mark was fantastic. Understood my problem immediately and took action equally as fast all the while being kind, attentive, and knowledgeable.
- Reviewed on 4/10/2025
Yes, it was my first visit to this office and to see Dr. Mark as my new physician. I liked him very much. [redacted] He was much better than the other provider I saw in the Wellesley office, [redacted] She didn't even look at me when I spoke to her. So I'm very pleased with Dr. Mark. Thank you.
- Reviewed on 3/30/2025
He listened carefully, was respectful , answered my questions. and had a nice disposition