QUEST DIAGNOSTICS LLC
NPI 1346792355
Clinical Medical Laboratory in New Haven, CT

Active since October 26, 2016
374 GRAND AVE, FIRST FLOOR, NEW HAVEN, CT 06511(206) 786-6556 Get Directions Write a Review

NPPES record last updated: December 10, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 10, 2022, Dec 7, 2018, Oct 26, 2016 (3 updates tracked since 2016).

About Quest Diagnostics Llc NPPES

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

QUEST DIAGNOSTICS LLC (NPI 1346792355) is a healthcare organization registered as a clinical medical laboratory in New Haven, Connecticut and active in the NPI registry since October 2016. The organization lists Charles Albert Bowles, Vice President, as its authorized official.

NPPES Registry Identity

NPI1346792355
Entity TypeOrganization
Primary Taxonomy291U00000X
Legal Business NameQUEST DIAGNOSTICS LLC
Location Address374 GRAND AVE, FIRST FLOORNew Haven, CT 06511
Mailing Address1201 S Collegeville RdCollegeville, PA 19426-2998 · (866) 697-8378
Organization SubpartYesParent: Quest Diagnostics Incorporated
Authorized OfficialCharles Albert BowlesVice President · (610) 454-4122
Enumeration DateOctober 26, 2016
Last NPPES UpdateDecember 10, 20223 updates tracked since enumeration
NPPES CertifiedDecember 10, 2022
✔ NPI 1346792355 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinical Medical LaboratoryLaboratories
Taxonomy Code291U00000X
Definition
(1) A clinical laboratory is a facility for the biological, microbiological, serological, chemical, immunohematological, hematological, biophysical, cytological, pathological, or other examination of materials derived from the human body for the purpose of providing information for the diagnosis, prevention, or treatment of any disease or impairment of, human beings. These examinations also include procedures to determine, measure, or otherwise describe the presence or absence of various substances or organisms in the body. Facilities only collecting or preparing specimens (or both) or only serving as a mailing service and not performing testing are not considered clinical laboratories. (2) Any facility that examines materials from the human body for purposes of providing information for the diagnosis, prevention, or treatment of any disease or impairment of, or the assessment of, the health of human beings. Typical divisions of a clinical laboratory include hematology, cytology, bacteriology, histology, biochemistry, medical toxicology, and serology.
374 GRAND AVE, New Haven, CT 06511

Medicare Participation & PECOS CMS

Medicare enrollment and revalidation status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Quest Diagnostics Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by November 30, 2026

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateConnecticutEnrollment IDO20071227000131Non-DME Part B · Independent Clinical LaboratoryDue dateNovember 30, 2026
Source: CMS Revalidation Due Date List, October 2026 release.

Other Providers at the Same Location NPPES

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

Nurse Practitioner (Community Health)
374 GRAND AVE, FAIR HAVEN COMMUNITY HEALTH CTR
NEW HAVEN, CT 06511

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 Quest Diagnostics LLC's NPI number?

The NPI number for Quest Diagnostics LLC is 1346792355. It was assigned to this organization in the NPPES registry on October 26, 2016.

Where is Quest Diagnostics LLC located?

Quest Diagnostics LLC is located at 374 Grand Ave First Floor, New Haven, CT 06511. The listed phone number is (206) 786-6556.

What is Quest Diagnostics LLC's specialty?

The primary specialty registered for this NPI is Clinical Medical Laboratory with taxonomy code 291U00000X.

Is Quest Diagnostics LLC enrolled in Medicare?

Yes. Quest Diagnostics LLC is registered in the Medicare PECOS enrollment system.

When is Quest Diagnostics LLC's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (Connecticut, Independent Clinical Laboratory) is due for revalidation by November 30, 2026. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

When was this NPI record last updated?

The NPPES record for Quest Diagnostics LLC was last updated on December 10, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.