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MATTHEW CHRISTOPHER SIES M.D.
NPI 1518171826
Preventive Medicine - Preventive Medicine/Occupational Environmental Medicine in Los Angeles, CA

Active since May 09, 2007
5525 W SLAUSON AVE, LOS ANGELES, CA 90056(310) 642-0325(310) 642-0338 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Sep 11, 2025, Mar 7, 2023 (2 updates tracked since 2023).

About Matthew Christopher Sies M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MATTHEW CHRISTOPHER SIES M.D. (NPI 1518171826) is an individual preventive medicine/occupational environmental medicine provider in Los Angeles, California, licensed in California (A81334) and active in the NPI registry since May 2007.

NPPES Registry Identity

NPI1518171826
Entity TypeIndividualMale
Primary Taxonomy2083P0500X
Provider Legal NameMATTHEW CHRISTOPHER SIESCredential: M.D.
Location Address5525 W SLAUSON AVELos Angeles, CA 90056-1047
Mailing Address10824 Lindbrook Dr Apt 320Los Angeles, CA 90024-8914 · (310) 503-9474
Phone(310) 642-0325
Fax(310) 642-0338
Sole ProprietorYes
Enumeration DateMay 9, 2007
Last NPPES UpdateSeptember 11, 20252 updates tracked since enumeration
✔ NPI 1518171826 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPreventive Medicine · Preventive Medicine/Occupational Environmental MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2083P0500X
License✔ Licensed in CA · A81334
Definition
A preventive medicine physician who specializes in preventive medicine/occupational-environmental medicine, which is focused on protecting the population from occupational and environmental conditions.
Also ListedGeneral PracticeTaxonomy 208D00000X · License A81334 (CA)
5525 W SLAUSON AVE, Los Angeles, CA 90056
Open in Google Maps ↗

Other Identifiers 1

OtherWA81334ACA · Ppin

Other Providers at the Same Location NPPES 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SCOTT DOUGLAS STALLARD
Physical Therapist (Geriatrics)
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325
KND DEVELOPMENT 59 LLC
Hospitalist
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325
DR. NATALIE MEYER PHARMD
Pharmacist
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325
THC - ORANGE COUNTY LLC
Long Term Care Hospital
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325
DR. GILAT ENGLANOFF M.D.
Family Medicine
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325
THC - ORANGE COUNTY, LLC
General Practice
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325
MARIA EDNA ALABASTRO DE LA ROSA
Pharmacist (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist)
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 981-0680
GLENVIEW PATHOLOGY MEDICAL GROUP
Pathology (Anatomic Pathology & Clinical Pathology)
5525 W SLAUSON AVE
LOS ANGELES, CA 90056
Los Angeles County (310) 642-0325

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Matthew Sies's NPI number?

The NPI number for Matthew Sies is 1518171826. It was assigned to this individual provider in the NPPES registry on May 9, 2007.

Where is Matthew Sies located?

Matthew Sies practices at 5525 W Slauson Ave, Los Angeles, CA 90056. The listed phone number is (310) 642-0325.

What is Matthew Sies's specialty?

The primary specialty registered for this NPI is Preventive Medicine, specializing in Preventive Medicine/Occupational Environmental Medicine, with taxonomy code 2083P0500X.

When was this NPI record last updated?

The NPPES record for Matthew Sies was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.