Western Laboratories
NPI 1871555979 · Anatomic Pathology & Clinical Pathology Physician · Hayward, CA
Western Laboratories is a Anatomic Pathology & Clinical Pathology Physician organization in Hayward, CA (NPI 1871555979).
Provider details
- NPI number
- 1871555979
- Entity type
- Organization
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Elizabeth Treynor, Managing Partner(510) 264-4035
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
Other names (DBA / former)
- Doing business as
- Western Laboratory Medical Group
Registry dates
- Enumerated
- 2006-04-04
- Last updated
- 2017-04-12
Frequently asked questions
- What is Western Laboratories's NPI number?
- Western Laboratories's National Provider Identifier (NPI) is 1871555979, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Western Laboratories?
- Western Laboratories is classified in the NPPES registry as Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Western Laboratories located?
- Western Laboratories's practice location on file with NPPES is 27200 Calaroga Ave, Hayward, CA 94545-4339.
- What is Western Laboratories's phone number?
- The practice phone number listed in the NPPES registry for Western Laboratories is (510) 264-4035.
- Who is the authorized official for Western Laboratories?
- The authorized official listed on Western Laboratories's NPPES record is Elizabeth Treynor, Managing Partner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Western Laboratories's NPI active?
- Yes — Western Laboratories's NPI (1871555979) is active in the NPPES registry as of the last update on 2017-04-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.