Matthew K. Nienaber, DO
Santa Monica, CA 90403
The Doctors of Saint John's - Santa Monica Primary Care
1821 Wilshire Boulevard, Suite 100, Santa Monica, CA 90403

2026 Golden State Patient
Experience Award Recipient
The Golden State Patient Experience Awards is Providence’s California-wide program, recognizing providers in Northern and Southern California who consistently deliver outstanding patient experiences, based on patient feedback and experience scores.
Insurances Accepted
This information provides an overview of accepted insurance plan types for new patients. Coverage may vary by specific plan. Please verify with your insurance provider before visiting us for care. Established patients should call to verify insurance acceptance.
About Matthew K. Nienaber
A West Coast native, born in the Bay Area and raised in the Pacific Northwest with one foot in the sand and one in the water. Caring and compassionate, working 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. Formerly a competitive dragon boat racer, who plays piano and bass, with an eye for restoring classic British race cars.
Western University of Health Sciences
2014
Arrowhead Regional Medical Center
2015
Arrowhead Regional Medical Center
Internal Medicin\e
2017
- American Osteopathic Board of Internal Medicine, Internal Medicine
1821 Wilshire Boulevard, Suite 100
Santa Monica, CA 90403
Providence Saint John's Health Center
Community Reviews
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Dr Nienaber is a kind and caring physician. He has been my primary care doctor for close to 10 years. Recently he supported my weight loss journey of 95 pounds with Zepbound which has improved my overall health. When my husband of 55 years passed away 6 months ago, Dr. Nienaber and the office tech staff who knew my husband helped me deal with my grief. Their efforts to comfort me meant a great deal.
Providence Patient
Dr. Nienaber is fantastic. For years, he has been attentive and insightful. In fact he has probably saved my life more than once.
Providence Patient
Always happy with my doctor.
Providence Patient
Dr. Nienaber is so patient and just fantastic.
Providence Patient
All good!! From my very first meeting with Dr. Nienaber I feel extremely lucky to have been able to know that he is absolutely there for me, no matter what! Everything from his "bedside manner" to his consistency demonstrates that he is a very special health care provider and I am extremely grateful to be his patient!!!
Providence Patient
Great doctor
Providence Patient