NPIMap

Organization Active NPI

Unilab Corporation

  • Clinical Medical Laboratory
  • West Hills, CA
National Provider Identifier
1366479099
Registry record updated May 23, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Clinical Medical LaboratoryTaxonomy code 291U00000X
License
05D0642827 Issued in CA
Legal business name
UNILAB CORPORATION
Practice address
8401 Fallbrook Ave
West Hills, CA 91304-3226
Phone
(800) 877-2515
NPI assigned
Jun 27, 2006
Organization subpart
Yes
Parent organization
QUEST DIAGNOSTICS INCORPORATEDAs reported in NPPES

NPPES NPI Registry

Updated by the provider on May 23, 2025

Registry information is reported by the provider to CMS and is not verified. About this source

Authorized official

Name
Leah D Timmerman
Title
Vice President
Phone
(973) 520-2700

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Clinical Medical Laboratory 291U00000X 05D0642827 CA Primary

Addresses

Primary practice location

8401 Fallbrook Ave
West Hills, CA 91304-3226

Mailing address

14275 Midway Rd Ste 400
Addison, TX 75001-3614
Phone (866) 697-8378

Other names 1

  • Quest Diagnostics Doing business as

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20040204001064 CA Part B Supplier - Independent Clinical Laboratory 7618874512 16 other NPIs on this enrollment
Practice locations: Arcadia, CA; Orange, CA; Redlands, CA; San Diego, CA; Ventura, CA; West Hills, CA

Other NPIs with the same Medicare PAC ID 3

NPIs whose Medicare enrollments share a PECOS associate control ID (the same enrolled entity).

Other NPIs on the same Medicare enrollment 13

NPIs listed together on one Medicare enrollment, typically parts of the same organization.

View all 13

Laboratory certificates & supplier records

Derived by NPIMap

These CMS records do not include an NPI. They are shown because their name and street address match this provider’s.

CLIA laboratory certificates

CLIA numberLaboratoryCertificateExpires
05D0642827Quest Diagnostics8401 Fallbrook Ave, West Hills, CA 91304AccreditationFeb 27, 2027

National Provider Directory

National Provider Directory
Tax ID family
Quest Diagnostic22 organizations share this tax ID, including this one
Part of
Questdiagnost Ic Inc

Other organizations with this tax ID 21

Organizations that report the same tax identification number in the National Provider Directory.

View all 21

Locations (25 of 46)

612 W Duarte Rd
Ste 104
Arcadia, CA 91007
Phone (626) 445-4120

701 Highland Springs Ave
Ste 6
Beaumont, CA 92223
Phone (909) 769-0300

10230 Artesia Blvd
Ste 305
Bellflower, CA 90706
Phone (562) 461-8706

3801 Las Posas Rd
Ste 208
Camarillo, CA 93010

500 Paseo Camarillo
Ste 103
Camarillo, CA 93010

5562 Philadelphia St
Ste 206
Chino, CA 91710

480 Fourth Ave
Ste 101
Chula Vista, CA 91910

2071 Compton Ave
Ste 105A
Corona, CA 92881

6170 Hamner Ave
Eastvale, CA 91752
Phone (951) 360-1911

488 E Valley Pkwy
Ste 314
Escondido, CA 92025
Phone (760) 489-1458

7880 Wren Ave
Ste A114
Gilroy, CA 95020

3600 N Verdugo Rd
Ste 303
Glendale, CA 91208

800 S Central Ave
Ste 205
Glendale, CA 91204

801 S Chevy Chase Dr
Ste 50
Glendale, CA 91205

4477 W 118th St
Ste 102
Hawthorne, CA 90250

5103 Garfield St
La Mesa, CA 91941
Phone (619) 463-9917

2650 Elm Ave
Ste 101
Long Beach, CA 90806

4036 S Centinela Ave
Los Angeles, CA 90066

1127 Wilshire Blvd
Ste 203
Los Angeles, CA 90017

777 Knowles Dr
Ste 1
Los Gatos, CA 95032

50 E Main Ave
Ste B
Morgan Hill, CA 95037

355 Placentia Ave
Ste 204
Newport Beach, CA 92663

65 N Madison Ave
Ste 305
Pasadena, CA 91101

250 W Bonita Ave
Bldg A
Pomona, CA 91767

36101 Bob Hope Dr
Ste E6
Rancho Mirage, CA 92270

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1151366400000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1747958400000",
    "number": "1366479099",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "14275 MIDWAY RD STE 400",
            "city": "ADDISON",
            "state": "TX",
            "postal_code": "750013614",
            "telephone_number": "866-697-8378"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "8401 FALLBROOK AVE",
            "city": "WEST HILLS",
            "state": "CA",
            "postal_code": "913043226",
            "telephone_number": "800-877-2515"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "UNILAB CORPORATION",
        "organizational_subpart": "YES",
        "parent_organization_legal_business_name": "QUEST DIAGNOSTICS INCORPORATED",
        "enumeration_date": "2006-06-27",
        "last_updated": "2025-05-23",
        "certification_date": "2025-05-23",
        "status": "A",
        "authorized_official_last_name": "TIMMERMAN",
        "authorized_official_first_name": "LEAH",
        "authorized_official_middle_name": "D",
        "authorized_official_title_or_position": "VICE PRESIDENT",
        "authorized_official_telephone_number": "973-520-2700"
    },
    "taxonomies": [
        {
            "code": "291U00000X",
            "taxonomy_group": "",
            "desc": "Clinical Medical Laboratory",
            "state": "CA",
            "license": "05D0642827",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Quest Diagnostics",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

Other providers in West Hills, CA

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 23, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.