Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Matthew Nienaber, DO

Individual provider Internal Medicine Physician · NPI 1033535182

Dr. Matthew Nienaber, DO is an Internal Medicine in Santa Monica, California. Qualified in 2014, 12 years ago. Practices with Providence Saint Johns Medical Foundation, a 285-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
12
Licensed in
CA
In the registry since
2014
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1821 Wilshire Blvd Ste 100
Santa Monica, CA 90403-5627
Phone: (310) 575-3100
Fax: (310) 575-3102
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 355 Abbott St Ste 100, Salinas, CA 93901-4484 — (831) 751-7070

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20A14759 (CA)

Record details

NPI number1033535182
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 13, 2014
Last updated in NPPESMay 28, 2026
Certification dateMay 28, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2014 (12 years in practice)
Group practice Providence Saint Johns Medical Foundation — 285 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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