
About Matthew Nienaber, D.O.
Born on the West Coast, native of the Bay Area, Matthew K. Nienaber, D.O., was raised in the Pacific Northwest with one foot in the sand and one in the water.
Caring and compassionate, Dr. Nienaber works with his patients to provide individualized healthcare. With a strong passion for helping the underserved, he participates in medical missions to Africa, South America, and Mexico.
Dr. Nienaber earned his medical degree at the Western University College of Osteopathic Medicine of the Pacific in Pomona, California. He completed his internship and residency at the Arrowhead Regional Medical Center in Colton, California.
Dr. Nienaber’s patients say he is an excellent practitioner, is courteous and professional, and puts you at ease. They feel truly fortunate to have Dr. Nienaber as their primary physician.
Dr. Nienaber is a former competitive dragon boat racer. He enjoys playing piano and bass, as well as restoring classic British race cars.
I feel like my Doctor really cares about my health
Real Patient
Medical Service
Adult Primary Care & PediatricsLocations
1821 Wilshire Blvd.,
Suite 100,
Santa Monica,
CA
90403
(310) 575-3100
Education
Medical School
Western University College of Osteopathic Medicine of the Pacific
Internship
Arrowhead Regional Medical Center, Colton, CA
Residency
Arrowhead Regional Medical Center, Colton, CA
Languages
HMO
- Aetna Commercial HMO:6013542
- Anthem Blue Cross Commercial HMO:GWR202
- Blue Shield Commercial HMO:100322538002
- Blue Shield 65 Plus Medicare HMO:100322538002
- Cigna Commercial HMO:1491457
- Health Net Commercial HMO: 3717235718
- Humana Medicare HMO: 435265SCAN
- Health Medicare HMO:398542
- United Healthcare Commercial HMO:0309480009
- United Healthcare Medicare HMO:0302470090
Other
- Aetna – HMO
- Aetna Medicare Advantage PPO
- Aetna PPO
- Anthem Blue Cross HMO
- Anthem Blue Cross PPO
- Blue Shield of CA HMO
- Blue Shield of CA HMO – Trio
- Blue Shield of CA Medicare Advantage
- Cigna HMO
- Cigna PPO
- First Health/Coventry PPO
- Health Net – TriCare
- Health Net PPO
- Health Smart PPO
- Multiplan PPO
- Oscar EPO
- SCAN Medicare Advantage
- United Healthcare Medicare Advantage
- Vivity by Anthem Blue Cross
- Providence Saint John’s Health Center
Hospital Affiliation
- Saint John’s Physician Partners

Reviews
At Providence, we’re dedicated to providing you quality, personalized health care. We are constantly striving to optimize your experience.
As part of ensuring you have a positive experience with Providence, our online provider directory includes ratings and patient comments for select providers. More about our survey.
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- 206 Reviews
- 128 Comments
All good
Providence PatientDr. Nienaber is very friendly and helpful.
Providence PatientDr Nienaber was great
Providence PatientI have never had any problems with this facility. Doctors are great, and the reception are very friendly and helpful.
Providence PatientExcellent care and information regarding the questions I presented
Providence PatientVery good physician
Providence PatientVery nice and helpful staff. The doctor put me at ease and was very helpful and knowledgeable. Very happy with the whole experience. Thank you.
Providence PatientAll good experiences , thanks :)
Providence PatientI have worked with Dr. Nienaber for over 4 years now. Not once have I ever felt rushed in our appointments - he would always take the time to make sure he answered all of my questions and that I was feeling okay about what we had talked about. I always felt heard and understood. I always felt comfortable enough to ask questions I might not ask another provider. I always felt like he was immensely knowledgeable about whatever topic we discussed. Let me put it this wayI've moved a couple times within the last 3 years, so I'm not as close distance-wise to his office, but I decided not to change my PCP to a doctor who might be closer by because that's how much I value the work and care that Dr. Nienaber provides.
Providence PatientThe best experience I've ever had at a doctor's office. Outstanding customer service and the doctor actually listened to my priorities and concerns for the first time ever at a doctor's office.
Providence PatientI have had excellent experiences with my doctor.
Providence PatientI love Dr. Matt. He is terrific!
Providence PatientAmazing doctor the best!
Providence PatientThe doctor was well-prepared and had reviewed my medical history in relation to the issue I was asking about in advance. He answered all my questions, did not dismiss any of them as "silly," and explained why he came to his conclusions. He also told me what to look for in the future. Couldn't have asked for a better response or more thoughtful treatment.
Providence PatientEveryone was wonderful and efficient. No waiting at all!
Providence PatientI have had only good experiences with Dr Nienabor. He is excellent
Providence PatientDr. Matt was very caring & welcoming. Will be transferring my care to him.
Providence PatientTakes time to listen to me and answer my questions. Great bedside manner.
Providence PatientHe was a very good listener and knowledgeable about my concerns. I enjoyed our interaction and felt supported
Providence PatientI feel lucky to have found this provider years ago and continually receive fantastic care and respect
Providence PatientI've been seeing Dr. Nienaber for a few years now, and I have to say the overall majority of my experience has been fantastic. My ONLY bone to pick was during the summer of 2022 when I was in need of a cardiology referral, but could not get one for what ended up being over a month. Only after an ER visit with notes that I needed to see a cardiologist did I receive my referral. That was disappointing. Again though, other than that, he's been a great provider these last several years.
Providence PatientEveryone in Dr. Nienaber's office is professional, friendly and excellent at their job! Dr. Nienaber is the best!
Providence PatientI finally found the right place when I found Dr N and the supporting team.
Providence PatientThis Doctor and office staff are the highest quality and respectfulness I've ever encountered.
Providence PatientI am so pleased with all of my experiences to date with Dr Matthew Nienaber and staff. Always courteous, professional and beyond expectations. Dr. Nienaber is FANTASTIC!
Providence PatientThe very best ! No doubt
Providence PatientDoctor Nienaber is a very caring great physician.
Providence PatientVery good experience.
Providence PatientExcellent care from Dr Nienaber
Providence PatientI have to say that my experiences have never been anything but exceptional regarding this provider.
Providence PatientDr. Neinabor was excellent.
Providence PatientThis group is fantastic. Every single member I have ever interacted with has always been great. Courteous, efficient, and compassionate. Dr. Nienaber is my all time favorite physician. He has a wonderful way of interacting. He's informative, intuitive and always has a positive way of trying to encourage me to take better care of myself without coming across as critical or judgemental. Like many people, I enter the Drs office with a bit of fear and dread, but always leave feeling positive and motivated and I think that is the highest praise for a physician.
Providence PatientThis is the very first time I have been able to meet the doctor and whilst I feel he is going to be very good for me most of these question do no apply to us since I have never met him before
Providence PatientMy care provider is amazing ; but I don't like the new stuff and also this facility is a pediatrician office ; which was never like that ; I don't like to be waiting with kids in the reception area
Providence PatientGreat care provider.Excellent Doctor
Providence PatientHe is very good
Providence PatientDr. Nienaber is a caring doctor. He listens and does not rush you and explains when you don't get it the first time. I am glad he is my primary physician.
Providence PatientI have been a patient of Dr. Nienaber for 4 years, and he is the best! He definitely cares about his patients and provides the best care.
Providence PatientFirst time with new pcp and was very impressed
Providence PatientVery good experience
Providence PatientI am very Pleased with Dr Ninaber he is very complete and knows about all my Appointments with other Providers. He definitely is prepared for my Appointments and can answer all my questions.
Providence PatientI find Dr Nienaber to be professional and relatable. I am pleased with him and those in the office and plan to continue my relationship for the foreseeable future.
Providence PatientI think I made a good twist with choosing this provider because I'm happy.
Providence PatientThe best!
Providence PatientDr. Nienaber is the BEST! He has always had a great demeanor, excellent medical knowledge, and a willingness to be patient with me and listen carefully to my health concerns. I really feel that Dr. Nienaber is "on my side" and will do whatever it takes to keep me properly informed and excellently cared for. I truly hope that I will be able to call Dr. Nienaber "My Doctor" for many more years to come.
Providence PatientMy experience with my provider was very satisfying
Providence PatientGreat doctor and super responsive to my inquiries.
Providence PatientHe addressed all of my health concerns and sought to cure them.
Providence PatientI'm very satisfied with the care and services that I receive from my provider.
Providence PatientAlways informed of my medical condition and is right on top of my prescriptions and refills!
Providence PatientGood
Providence PatientLove this Doctor He is the greatest
Providence PatientGreat Doctor, great manner.
Providence PatientAll good
Providence PatientI am very happy with Dr. Matthew Nienaber and his pleasant, attentive personality.
Providence PatientGreat!!
Providence PatientSo grateful to have Dr. Nienaber and the team!
Providence PatientDr. Nienaber is an excellent doctor, he was patient, kind and explained everything thoroughly.
Providence PatientAlways available and easily accessible!
Providence PatientHappy with my experience. Felt the doctor had genuine care and respect.
Providence PatientMy provider is the best.
Providence PatientEverything. Ok.
Providence PatientI feel very lucky to have found Dr. Nienaber.
Providence PatientProviders at this office were always polite and showed concern at all times. I was welcomed by a friendly greeting upon entering. I saw dr. Nienabor within a few minutes and was impressed by his appropriate and accurate response to my problem. In addition he was caring and reassuring which helped me a great deal in a stressful situation. He is one of the best physicians I have ever seen.
Providence PatientAs always Dr. Nienaber listened to my concerns regarding varicose veins on my legs, he explained about the ones on my legs + referred me to Vascular Surgeons that he said are very good at what they do. His confidence always helps take concerns away -- he's a good doctor because when you leave his office you know that all w/b well.
Providence PatientHe is an awesome doctor. I mentioned a wrist problem and he showed me how a palm massage can help it. Felt so good. I've been doing it before I exercise which has been helpful. Love Dr Nenebor.
Providence PatientGREAT DOCTOR
Providence PatientExcellent care all around
Providence PatientLove Dr. Neinaber!
Providence PatientDr Nienaber is the best doctor on the west coast. Always thoughtful, kind, and considerate.
Providence PatientEvery time the visits are prompt and effective
Providence PatientHe is the best doctor I have ever known and I am 60 years old.
Providence PatientDr. Nienaber is the kindest, most supportive PCP I've ever had. He listens to you and advises accordingly. He's never steered me wrong. He's amazing!
Providence PatientI have only had good experiences!!
Providence PatientIt is always a pleasure to talk to doctor Nienaber
Providence PatientDr is very helpful,and kind.I really like him
Providence PatientExcellent experience
Providence PatientExcellent doctor
Providence PatientDr. Nienaber was very attentive, listened not only to what I said but understood the concern I had behind what was said. He was a good listener. He was knowledgeable and had respect for what the I said and addressed my concerns.
Providence PatientAlways a good experience.
Providence PatientDr. Nienabor is an exceptional doctor who listens and responds with helpful and pertinent information. He shows legitimate concern regarding well being.
Providence PatientI love Dr Nienaber he all ways spend enough time to listen to my questions and explain and answer my questions. I forgot the name of the guy who help me to check out but he was very friendly
Providence PatientDr. Nienaber actually listened and seemed like he cared about what my needs/concerns. I have switched doctors due to some seeming condescending or not available. It has been important to me to find a physician that listens and Dr. Nienaber has that ability.
Providence PatientLove Dr Neinaber, always listens, explain things. Gets back to me quickly if I message him about anything. Very known and personable, easy to talk too.
Providence PatientThe staff from the desk to the nurses to the doctor were all super nice. The doctor knew my medical history. Walked through my blood test results and made recommendations. He had time for me to ask questions. I was very satisfied with the care and attention I was provided.
Providence PatientAll experiences good.
Providence PatientI am so appreciative of how willing Dr. Nienaber is to listen to my concerns. A rare doctor where I'm don't feel like I'm being rushed out.
Providence PatientDr. Nienaber was spectacular. He was understanding and genuinely listened to hear my concerns.
Providence PatientI have a excellent attendance and very good experience
Providence PatientMy experience and expectations have always been surpassed!
Providence PatientI felt that I had to wait too long to see the doctor for an appointment.
Providence PatientGood
Providence PatientDoctor is very informative. He also remembers our past discussions and gives good advice.
Providence PatientSuper doctor
Providence PatientI adore Dr. Nienaber. He is compassionate and a great listener. I feel very safe talking to him about my health issues. The people at the front desk are also friendly and try to help me as much as they can considering how busy they are.
Providence PatientI'm very satisfied with this provider and had no problems whatsoever.
Providence PatientAll-around very satisfied with the services and medical attention provided.
Providence PatientHe's a very good Doctor
Providence PatientThis doctor is the best! He is very caring.
Providence PatientIt was a great experience
Providence PatientDr. Nienaber was fantastic! Looking forward to him being my full time physician.
Providence PatientIts always been fine
Providence PatientBoth Dr. Nienaber and his staff are always kind, patient, and helpful! I am very happy overall!
Providence PatientI have been so happy having Dr. Nienaber as my doctor.
Providence PatientThe office is well run, the staff is friendly and courteous, and I wish I had known about Dr. Mathew years ago.
Providence PatientI always get excellent experiences relative to my health care provider.
Providence PatientDr. Nienber takes the time to listen and explain my health care
Providence PatientThey were very nice to me
Providence PatientGreat guy. Felt comfortable.
Providence PatientMy care provider remembers and shows appreciation for the information I bring with me.
Providence PatientI feel like my Doctor really cares about my health
Providence PatientGreat
Providence PatientExcellent
Providence PatientAll very good
Providence PatientDr. Neinaber understands my condition and what I am doing to help keep me healthy. It's a team effort that is progressing with a good outcome.
Providence PatientDr. Nienaber is an excellent practioner. He is courteous, professional and really puts you at ease. I am very fortunate to have Dr. Nienaber as my primary physician.
Providence PatientI was very happy with my visit. I liked my new Doctor very much
Providence PatientDr. Nienaber is a very knowledgeable physician. I just wish they were more follow up after each visit. for example, the doctor orders a test, I get the test done, but I never get a call about what to do with the results. I am left in the dark until the next visit!
Providence PatientI am extremely pleased with my provider.
Providence PatientDr nieneber is a knowledgeable, caring and receptive doctor. He really makes you feel comfortable and always open to listen to patient.
Providence PatientThe doctor is a good listener and made me feel very comfortable. He is a compassionate individual
Providence PatientMy provider is a very smart person. He treats me as a partner in my healthcare and listens to my options and gives them due consideration. Also, he is not offended by my directness and questions about why he has made decisions about my care. [...]
Providence PatientDr Nienaber and staff are very professional, compassionate and understanding of senior issues.
Providence PatientDr. Nienaber caring, organized, knowledgeable professional. Staff very friendly and courteous
Providence PatientDr Neinaber is the best!!!
Providence PatientThe office team is very friendly and warm welcoming, so that makes you feel at ease. Dr. listens closely and gives you his professional advice in a way that I can understand and feel comfortable. I am fortunate to be under his care.
Providence PatientI am very satisfied with the attention and care I receive from my doctor and his staff. I plan stay with him as long as I can.
Providence PatientVery good listener and thoughtful and knowledgeable
Providence Patient