Quest Diagnostics LLC
Quest Diagnostics LLC is a healthcare organization registered as Clinical Medical Laboratory in Stamford, CT, holding Type 2 (organization) NPI 1780886333 since 2007. The authorized official on file is G Cartier, Vp of Billing.
✓ Active NPI ✓ Valid NPI checksum Organization subpart
| NPI | 1780886333 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Quest Diagnostics LLC |
| Parent organization | Quest Diagnostics Incorporated |
| Practice address | 1250 SUMMER ST, SUITE 206, Stamford, CT, 06905 |
| Phone | 8778682191 |
| Enumeration date | 2007-06-05 |
| Last updated in NPPES | 2007-11-26 |
Authorized official
| Name | G Cartier |
|---|---|
| Title | Vp of Billing |
| Phone | 4846767731 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 291U00000X | Clinical Medical Laboratory | Primary | — | CT |
Copy-ready billing details
Provider: Quest Diagnostics LLC NPI: 1780886333 Taxonomy: 291U00000X (Clinical Medical Laboratory) Address: 1250 SUMMER ST, SUITE 206, Stamford, CT, 06905
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1891785176 | Greg Besson | Individual | Physical Therapist | Stamford, CT |
| 1033281456 | Elissa Diamond | Individual | Chiropractor | Stamford, CT |
| 1174674519 | David Israel | Individual | Clinical Psychologist | Stamford, CT |
| 1598817413 | William Weiss | Individual | Physical Therapist | Stamford, CT |
| 1225162845 | Joseph Brady | Individual | Social Worker | Stamford, CT |
| 1326240870 | Marilyn Mcquade | Individual | Physical Therapist | Stamford, CT |
| 1134322506 | Donald Wood | Individual | Physical Therapist | Stamford, CT |
| 1477734887 | Emily Besson | Individual | Physical Therapist | Stamford, CT |
Verify this record
Cross-check NPI 1780886333 against the authoritative CMS record: view Quest Diagnostics LLC on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Who is the authorized official for Quest Diagnostics LLC?
What is the NPI number for Quest Diagnostics LLC?
Source: CMS NPPES (public data). Snapshot 2026-07-10. Provider record last updated 2007-11-26.