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.

  • 4.9
  • 167 Reviews
  • 483 Comments
  • 5
10/25/2026

Good

Providence Patient
  • 5
10/22/2026

We appreciate each member of this health team.

Providence Patient
  • 5
10/22/2026

DOCTOR knee NEIGHBOR and his staff are wonderful and I appreciate everything that they do for me all the time. They are great when I'm there they are great on virtual. The clinical staff is fantastic and I really appreciate all their help. I have never been let down yet in all the years I've been going there.

Providence Patient
  • 5
10/21/2026

Great Doctor

Providence Patient
  • 5
10/19/2026

I always have excellent experiences with Dr. Nienaber and his team. He is always professional, knowledgeable and courteous.

Providence Patient
  • 5
10/18/2026

No comentarios todo perfect

Providence Patient
  • 5
10/17/2026

Dr Neinaber is caring and interested and provides great support and medical care as I need. I enjoy my appointments accordingly and am always in and out in a timely manner.

Providence Patient
  • 5
10/11/2026

EVERY SINGLE staff member in the office is absolutely kind, considerate, and professional. ALWAYS!!

Providence Patient
  • 4.89
10/09/2026

I was happy with the provider.

Providence Patient
  • 5
10/05/2026

Dr. Nienaber is always compassionate, super solicitous and down-to-earth. And the office staff is always friendly and efficient. I am thoroughly satisfied with and grateful for the care I am receiving there.

Providence Patient