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

Selected: Up Next:

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
  • 338 Comments
  • 5
04/30/2025

Great provider that listens and is very professional.

Providence Patient
  • 5
04/30/2025

Great Doctor

Providence Patient
  • 5
04/26/2025

My PCP is kind, caring, professional.

Providence Patient
  • 5
04/26/2025

Dr. Nienaber is professional, personable and competent. We are very happy with him.L

Providence Patient
  • 4.89
04/22/2025

All adequate

Providence Patient
  • 5
04/22/2025

Great Doctor

Providence Patient
  • 5
04/18/2025

Everyone concerned is very profesional and pleasant.

Providence Patient
  • 5
04/17/2025

My provider and all the staff are always friendly, informative and offer help in a timely manner. I could not ask for a better health care team.

Providence Patient
  • 5
04/15/2025

My care provider gave me very good practical exercises to maintain and improve my health.

Providence Patient
  • 5
04/13/2025

Dr Nienaber is my PCP and I am very happy with his service. Very patient, knowledgeable, professional, and attentive.

Providence Patient