Matthew Sies, M.D.
NPI 1518171826 · Preventive Medicine/Occupational Environmental Medicine Physician · Los Angeles, CA
Matthew Sies, M.D. is a Preventive Medicine/Occupational Environmental Medicine Physician provider in Los Angeles, CA (NPI 1518171826).
Provider details
- NPI number
- 1518171826
- Entity type
- Individual
- Primary specialty
- Preventive Medicine/Occupational Environmental Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A81334 (CA)
Specialties & taxonomies
- Preventive Medicine/Occupational Environmental Medicine PhysicianPrimary2083P0500XLicense A81334 (CA)
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-09
- Last updated
- 2025-09-11
Frequently asked questions
- What is Matthew Sies's NPI number?
- Matthew Sies's National Provider Identifier (NPI) is 1518171826, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Sies's specialty?
- Matthew Sies is listed in the NPPES registry with a primary specialty of Preventive Medicine/Occupational Environmental Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Sies located?
- Matthew Sies's practice location on file with NPPES is 5525 W Slauson Ave, Los Angeles, CA 90056-1047.
- What is Matthew Sies's phone number?
- The practice phone number listed in the NPPES registry for Matthew Sies is (310) 642-0325.
- Is Matthew Sies's NPI active?
- Yes — Matthew Sies's NPI (1518171826) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.