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

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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
  • 223 Reviews
  • 403 Comments
  • 5
11/30/2025

Just a great doctor. Kind, caring, patient, and reliable.

Providence Patient
  • 5
11/17/2025

Dr Nienaber is the best. He never feels rushed and always goes above and beyond to answer questions and concerns.

Providence Patient
  • 5
11/17/2025

Thank you for your extraordinary care.

Providence Patient
  • 5
11/16/2025

I had a positive experience with Dr. Nienaber.

Providence Patient
  • 5
11/11/2025

Dr. Nienaber provided the best care possible for the patients

Providence Patient
  • 5
11/09/2025

Dr. Nienaber is always responsive to my concerns. I feel fortunate that he is my primary care provider.

Providence Patient
  • 5
11/07/2025

Personal, friendly physician

Providence Patient
  • 5
11/06/2025

Best office very best Dr in years.

Providence Patient
  • 5
11/06/2025

Excellent care

Providence Patient
  • 5
11/06/2025

Dr. Nienaber has always been a great doctor for me and my family !

Providence Patient