Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Quest Diagnostics LLC

Organization Clinical Medical Laboratory · NPI 1851982623

Quest Diagnostics LLC is a Clinical Medical Laboratory in Chicago, Illinois. Registered with an NPI since 2021.

In the registry since
2021
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

5635 W Belmont Ave
Chicago, IL 60634-4384
Phone: (773) 736-1830
Fax: (773) 622-8055
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Medical Laboratory (primary) Taxonomy 291U00000X

Record details

NPI number1851982623
Entity typeOrganization (Type 2)
Organization subpartYes
Parent organizationQuest Diagnostics Incorporated
Authorized official Charles Bowles — Vice President · (610) 454-6000
NPI enumeratedFebruary 3, 2021
Last updated in NPPESFebruary 3, 2021
Certification dateFebruary 3, 2021
Mailing address1201 S Collegeville Rd, Collegeville, PA 19426-2998

Other providers in Chicago