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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JEFFREY FLUCK LCSW 139421
NPI 1851934673
Social Worker - Clinical in Upland, CA

Active since October 24, 2019
239 W 9TH ST, UPLAND, CA 91786(909) 981-6121 Get Directions Write a Review

NPPES record last updated: June 27, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: May 21, 2026, Dec 31, 2024, Dec 3, 2024 and 2 more (5 updates tracked since 2019).

About Jeffrey Fluck Lcsw 139421 NPPES

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

JEFFREY FLUCK LCSW 139421 (NPI 1851934673) is an individual clinical provider in Upland, California, licensed in California (LCSW139421) and active in the NPI registry since October 2019.

NPPES Registry Identity

NPI1851934673
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameJEFFREY FLUCKCredential: LCSW 139421
Location Address239 W 9TH STUpland, CA 91786-5979
Mailing Address239 W 9th StUpland, CA 91786-5979 · (909) 981-6121
Phone(909) 981-6121
Sole ProprietorNo
Enumeration DateOctober 24, 2019
Last NPPES UpdateJune 27, 20265 updates tracked since enumeration
NPPES CertifiedJune 27, 2026
✔ NPI 1851934673 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in CA · LCSW139421
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
239 W 9TH ST, Upland, CA 91786
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Other Providers at the Same Location NPPES 20

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

MICHAEL THOMPSON
Counselor (Addiction (Substance Use Disorder))
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121
VICTOR GOMEZ
Counselor (Addiction (Substance Use Disorder))
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121
TOREY RANSOM CADC II
Counselor (Addiction (Substance Use Disorder))
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121
MAHMOUD BENSUFIA
Peer Specialist
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (714) 797-1644
CLIFFORD RAY GARRETT
Counselor (Addiction (Substance Use Disorder))
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121
MICHAEL LAURENCE SANDS
Peer Specialist
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121
DARREN SARDIN
Counselor (Addiction (Substance Use Disorder))
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121
JOHN MORGAN
Counselor (Addiction (Substance Use Disorder))
239 W 9TH ST
UPLAND, CA 91786
San Bernardino County (909) 981-6121

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 Jeffrey Fluck's NPI number?

The NPI number for Jeffrey Fluck is 1851934673. It was assigned to this individual provider in the NPPES registry on October 24, 2019.

Where is Jeffrey Fluck located?

Jeffrey Fluck practices at 239 W 9th St, Upland, CA 91786. The listed phone number is (909) 981-6121.

What is Jeffrey Fluck's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Jeffrey Fluck was last updated on June 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 days 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.