Matthew Nienaber MD

Matthew Nienaber, D.O.

Internal Medicine

Not Accepting New Patients

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
Matthew Nienaber

Selected: Up Next:

Matthew K. Nienaber, D.O.
Family & Internal Medicine

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Family & Internal Medicine
01 / 02

Locations

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

Spanish

child checkup

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.

  • 5
  • 250 Reviews
  • 357 Comments
  • 5
05/21/2025

As always I was very satisfied with the service I received from my provider and as always they are very professional and helpful and I am very happy. Very courteous people

Providence Patient
  • 5
05/16/2025

Good experience

Providence Patient
  • 5
05/16/2025

I've been with this Doctor and office from the beginning. Probably the best choice of my life. They have done marvels for me even without me doing my best to get healthy.

Providence Patient
  • 5
05/16/2025

Dr Nienaber ROCKS A++++++

Providence Patient
  • 4.43
05/16/2025

All experiences have been great.

Providence Patient
  • 5
05/15/2025

I like this doctor, that's why I keep going back to this doctor.

Providence Patient
  • 5
05/11/2025

Dr. Matthew is going excellent and care for his patients

Providence Patient
  • 5
05/04/2025

Good

Providence Patient
  • 5
05/03/2025

My experience with my care provider has been excellent. The staff always helpful and courteous , always ask about my welfare and helping with procedures.My primary care , Dr. Nienaber, the best! Professional, caring, always answering all my questions and I feel he truly cares for me as his patient. Can't praise him enough.

Providence Patient
  • 5
05/02/2025

All of the care provided me here is always top notch.

Providence Patient