Quest Diagnostics LLC
Quest Diagnostics LLC is a healthcare organization registered as Clinical Medical Laboratory in Norwalk, CT, holding Type 2 (organization) NPI 1972521920 since 2006. The authorized official on file is Charles Bowles, Vice President.
✓ Active NPI ✓ Valid NPI checksum Organization subpart
| NPI | 1972521920 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Quest Diagnostics LLC |
| Parent organization | Quest Diagnostics Incorporated |
| Practice address | 40 CROSS ST, Norwalk, CT, 06851 |
| Phone | 8778682191 |
| Enumeration date | 2006-07-18 |
| Last updated in NPPES | 2022-11-22 |
Authorized official
| Name | Charles Bowles |
|---|---|
| Title | Vice President |
| Phone | 6104546000 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 291U00000X | Clinical Medical Laboratory | Primary | 07D0644813 | CT |
Copy-ready billing details
Provider: Quest Diagnostics LLC NPI: 1972521920 Taxonomy: 291U00000X (Clinical Medical Laboratory) Address: 40 CROSS ST, Norwalk, CT, 06851
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1104454644 | Joel Singh | Individual | Cardiovascular Disease Physician | Norwalk, CT |
| 1821095613 | Jaclyn Conelius | Individual | Nurse Practitioner | Norwalk, CT |
| 1700878733 | Norwalk Medical Group, PC | Organization | Internal Medicine Physician | Norwalk, CT |
| 1447242102 | Arthur Yee | Individual | Infectious Disease Physician | Norwalk, CT |
| 1659363356 | Marvin Den | Individual | Internal Medicine Physician | Norwalk, CT |
| 1689666372 | Anthony Coscia | Individual | Medical Oncology Physician | Norwalk, CT |
| 1174515803 | Richard Frank | Individual | Hematology & Oncology Physician | Norwalk, CT |
| 1144212887 | Dennis Huskins | Individual | Internal Medicine Physician | Norwalk, CT |
Verify this record
Cross-check NPI 1972521920 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
Where is Quest Diagnostics LLC located?
How current is this record?
Source: CMS NPPES (public data). Snapshot 2026-07-10. Provider record last updated 2022-11-22.