MATTHEW C. SIES M.D. – NPI #1518171826
Preventive Medicine
A preventive medicine physician who specializes in preventive medicine/occupational-environmental medicine, which is focused on protecting the population from occupational and environmental conditions.
MATTHEW SIES is a physician located in LOS ANGELES, CA. NPPES has assigned the NPI number 1518171826 to MATTHEW SIES on May 09, 2007. It is a Type-1 NPI, indicating this NPI number is associated with an individual. With multiple taxonomy codes selected, the primary taxonomy selected by this provider is 2083P0500X from the Health Care Provider Taxonomy code set, which is classified as Preventive Medicine, specializing in Preventive Medicine/Occupational Environmental Medicine
The NPI profile was last updated on Sep 11, 2025. Use the NPI data found here to bill health insurance companies, identify providers enrolled in Medicare and Medicaid services or other HIPAA compliant transactions. See the complete NPI profile for MATTHEW SIES below.
NPI Profile for
MATTHEW C. SIES
(more than 19 years ago)
LOS ANGELES, CA 90056-1047 Phone: (310) 642-0325 Fax: (310) 642-0338
LOS ANGELES, CA 90024-8914 Phone: (310) 503-9474 Fax:
Identifiers for MATTHEW SIES
Identifiers are used to associate other provider identifiers such as Medicaid or other insurers (ie:, Blue Cross, Blue Shield, Aetna, Kaiser-Permanente, etc.), with their NPI number. These identifiers can be used in matching an NPI number to an insurer's records. However, not all providers have such numbers and not all providers choose to include them in their NPI information.
| Description | Issuer | State | Identifier |
|---|---|---|---|
| other | PPIN | CA | WA81334A |
A taxonomy code is a code that describes the health care service provider's type, classification, and the area of specialization. The primary specialty for this provider is indicated as (Primary) below.
| Taxonomy Classification / Specialization | State | License |
|---|---|---|
| 2083P0500X - Preventive Medicine / Preventive Medicine/Occupational Environmental Medicine (Primary) |
CA | A81334 |
| 208D00000X - General Practice |
CA | A81334 |
The taxonomy codes are selected by the provider at the time of NPI registration. Selection of a taxonomy code does not replace any credentialing or validation process that the provider requesting the code should complete.