
Highlights
Age Groups Seen
- Pediatrics
- Teenagers
- Adults
- Geriatrics
Languages
- English
Gender
MaleLocations
- Massachusetts General Internal Medicine Associates
- 15 Parkman Street, Building 6, Boston, MA 02114
- Get Directions
- phone: 617-724-8400
- fax: 617-724-0331
Expertise
Education
- Residency: Family Medicine Larkin South Miami, Family Medicine, 2023
- Medical Education: Hospital das Clinicas da Faculdade de Medicina de Ribeirao Preto, 1999
Board Certifications
- Family Medicine: American Board of Family Medicine, 2023
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
- MassHealth ACO
- Medicaid CT
- Medicaid NH
- Medicaid RI
- Medicare
- Medicare ACO
- Multiplan
- Senior Whole Health
- Tricare
- Tufts Health Plan
- United Health Care
- Wellpoint
- WellSense
Ratings & Reviews
4.7 out of 5
229 ratings, 40 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 2/4/2026
He was very kind and respectful. His advice was very clear and he was very patient.
- Reviewed on 2/4/2026
This doctor gave me an excellent evaluation for my condition. He seemed very professional and bright, testing my hand grip strength, shoulder and back strength all areas that pertained to my cervical strain. He was treating me holistically from what I could tell. He knew about my health history and prescribed medications based on my current physical state. He offered me Physical Therapy which was so necessary due to my compromised neck injury. He was a serious doctor with seemingly good expertise. I felt as though I had a thorough evaluation and I appreciated the urgent appointment given.
- Reviewed on 2/4/2026
He was excellent. It was my first time meeting him as my doctor. I had left last year and I was given him as my new PCP. I was very happy and comfortable with him. He was very attentive, listened to everything that I had to say and try to find a solution. So I was very, very much happy with the service that I was provided.
- Reviewed on 1/27/2026
Dr Sainz-Rueda is caring, and always attends to my medical questions/ conditions. He is an amazing Dr!
- Reviewed on 1/17/2026
This is a new primary care physician for me. [redacted] Dr. nestor was very nice and thorough. He didn't spend as long with me as Dr. [redacted] used to, but I assume it was because he had to spend a good portion of the time allotted to me to review my file, which it was very clear he had done. He helped me get referrals for an MRI that I need and a gynecologist. I really appreciate that. I also like that he was so punctual. [redacted] I really appreciate Dr. Nestor's careful concern for me at this appointment.
- Reviewed on 1/16/2026
Dr. Rueda was great. He stepped in when my general practitioner was unavailable and he was extremely thorough and we discussed all kinds of different ailments and he made the right referrals for me and when I got feedback from the specialist, I have to see now that we know what the issue is, he obviously agreed with all of the outcome.
- Reviewed on 1/20/2026
This was my first visit to Dr. Rueda. He was asssigned to me (and me to him) after my own long-time PCP retired. Dr, Rueda was very nice and professional but it will take some time to get use to a new PCP.
- Reviewed on 1/16/2026
My first visit .. Very pleased . Thorough and attentive. plenty of time. Special effort to arrange needed tests same day
- Reviewed on 1/14/2026
I thought Dr. Nestor, as he liked to be called, was excellent. He listened to me. I think we had a good connection. I really appreciated his follow-up letter. I have to respond to that. He obviously listened to what I had to say and responded accordingly. And I was very impressed. So thank you very much.
- Reviewed on 1/10/2026
[redacted] I am delighted with Dr Rueda. As a physician I think he is careful, complete, responsible, and wise and I would highly recommend him to others. [redacted]
- Reviewed on 1/7/2026
Dr. Saw me on a timely basis was not late as some physicians have been.
- Reviewed on 1/5/2026
Good 'bedside manner', listened well, asked follow up questions, answered mine, very kind. Did not mention that sample from wound would be sent for culture, so I sent my follow up questions before I received his follow up letter with culture results. If I was aware that culture was being done, I would have just waited a bit longer. Not a big deal, just minor communication issue.
- Reviewed on 1/4/2026
Excellent manner
- Reviewed on 1/4/2026
Yes, I found Dr. Nestor to be very competent, friendly, and listened to me. And to be honest, I was a little surprised. He's such a good doctor. I'd never met him, but he was referred to me by a nurse, [redacted] That's all I have to say for right now.
- Reviewed on 1/1/2026
It's always a pleasure and Dr. Rueda is very professional. He's very careful. He's very attentive. He always knows everything before. He knows everything that was going on between me and other doctors. His recommendations are on top. He is excellent. I would recommend him to anybody. I would say this out loud to anyone that ever contacts me. Thank you again. And I wish you a happy new year, happy holidays to all of you. Bye-bye. Thank you.
- Reviewed on 12/24/2025
It's a very good feeling to know that you're in the hands of a caring, kind, and hopefully, and I feel he is, and very experienced, excellent physician. The nurses, I've known many for years going to Mass General for a long time, are the best money can buy. Let me put it to you that way. Very experienced, wonderful girls. That's all. Happy Merry Christmas and a happy, healthy New Year all.
- Reviewed on 12/22/2025
When I first met Dr. Nestor,I was taken off guard when he did a cognitive,and separate strength test,as I did not expect that at all!! However,the follow up from him & his staff,was phenomenal!! Also,when Dr. Nestor sent me a letter outlining & explaining my blood work,and cognitive and strength test in detail,everything all made sense. His expertise,knowledge,and explanation of what all the separate blood tests,cognitive & strength test was superb. As well as his postive comments about my diet,& swimming,exercise program. [redacted] I am grateful,& truely blessed to have Dr. Nestor as my Primary Care Physician. Dr. Nestor has my back covered,and I have the utmost confidence in all medical & life style decisions that he suggests to me. Sincerely, [redacted]
- Reviewed on 12/17/2025
I get excellent care. Everyone was professional and I was treated respectfully.
- Reviewed on 12/16/2025
Still on medicines and cough hasn't gone away. The doctor did do the X-rays for my concerns which I appreciated very much and everything was negative
- Reviewed on 12/16/2025
It was nice meeting with the doctor for the first time I felt comfortable and relaxed with my experience with him. Look forward to more visits.
- Reviewed on 12/19/2025
Hi, this provider wrote a report very quickly the same night that the x-rays were done and the blood was drawn and gave me a very thorough explanation of the findings. He recommended some stretches to help with my headaches and they are definitely helping. So that was great. And he also scheduled some MRIs that I think will give us a clearer picture about what additional steps we can take to completely eliminate the headaches in the future. So yeah, thank you very much. Dr. and [redacted] did a great job.
- Reviewed on 12/15/2025
Productive visit
- Reviewed on 12/7/2025
I met Dr. Nestor for the first time. I was very impressed. He had obviously read my file in detail. He seems a perfect fit for me in every way.
- Reviewed on 12/8/2025
Grateful they took the time to see when i needed it.
- Reviewed on 12/7/2025
He brushed off what I had to say. He stubbornly repeated the points he wanted to make. He rushed me out of the office.
- Reviewed on 12/3/2025
He spoke so softly I couldn't hear him [redacted]
- Reviewed on 11/27/2025
What a kind, informed and smart doctor. I've never been welcomed so well, inviting me to tell him ab myself so he could remember me. Gave me excellent care and guidelines to recover, including appropriate meds that did not interact w meds I am taking. He is great!
- Reviewed on 11/27/2025
Dr. Sainz Rueda was clearly well prepared, knowledgeable, thorough, patient, kind, respectful, while also being warm and friendly. I would be happy to be assigned to see him again at any time in the future if my PCP Dr. [redacted] is not available.
- Reviewed on 11/26/2025
Dr. Rueda is a thoughtful kind physician. He is meticulous in his treatment of patients.
- Reviewed on 11/23/2025
Caring--
- Reviewed on 11/23/2025
Wrote a two page follow up letter and sent to me the same day. Very informative. Ordered many more blood tests that my previous primary care physicians had ever ordered. Very thorough
- Reviewed on 11/22/2025
Dr Nestor Sainz Rueda was so thorough and attentive. I felt quite secure in his knowledge and professionalism. I was also very impressed with how thorough his after office visit clinical note. I felt heard and taken care of.
- Reviewed on 11/21/2025
This is [redacted]. Nestor was fine. I've seen him once before. He is the backup physician for my primary care, Dr. [redacted]. Absolutely fine. Thank you.
- Reviewed on 11/20/2025
Dr, Sainz-Rueda is very efficient in my my care.
- Reviewed on 11/19/2025
Excellant care. [redacted]
- Reviewed on 11/14/2025
I had a very positive experience with Dr. Nestor. He had never met me before, but he had spent 45 minutes looking through my records, which were recent records, which were very complex, and explained everything very, very well to me and my son. I appreciated his help and thought that he was very efficient, very kind, and very knowledgeable. And I appreciated being seen by him.
- Reviewed on 11/12/2025
The doctor was professional and friendly. Listened to my concerns and acted upon them.
- Reviewed on 11/15/2025
Professional... thorough ... caring
- Reviewed on 11/11/2025
My exposure to this provider was very brief and was only to have a culture sample taken. Nevertheless, the experience was excellent and the provider was friendly, professional and knowledgeable.
- Reviewed on 11/10/2025
Everything ok except I asked a question via email about my test results and no one has gotten back to me yet. Two days ago.