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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

MARISSA ASHLEY DE LEON
NPI 1679496236
Social Worker - Clinical in Garden Grove, CA

Active since July 31, 2026
10331 STANFORD AVE, GARDEN GROVE, CA 92840(714) 663-6000 Get Directions Write a Review

NPPES record added: July 31, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Marissa Ashley De Leon NPPES

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

MARISSA ASHLEY DE LEON (NPI 1679496236) is an individual clinical provider in Garden Grove, California, licensed in California (82947) and active in the NPI registry since July 2026.

NPPES Registry Identity

NPI1679496236
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMARISSA ASHLEY DE LEON
Location Address10331 STANFORD AVEGarden Grove, CA 92840-6351
Mailing Address16084 Pembrook WayChino Hills, CA 91709-8750 · (714) 663-6000
Phone(714) 663-6000
Sole ProprietorNo
Enumeration DateJuly 31, 2026
NPPES CertifiedJuly 31, 2026
✔ NPI 1679496236 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 · 82947
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.
10331 STANFORD AVE, Garden Grove, CA 92840
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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.

JESSICA DINH LCSW
Social Worker (Clinical)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000
MRS. GIULIANA VALDOVINOS LCSW
Social Worker (Clinical)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000
CASEY JONES
Psychologist (Clinical Child & Adolescent)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000
NICOLE GLEESON LCSW
Social Worker (Clinical)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000
BRIANNA MARIE WRIGHT
Social Worker (Clinical)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 630-6000
DAVID MORENO GUARDADO
Social Worker (School)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000
CELESTE RAMIREZ
Social Worker (Clinical)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000
FERNANDO BARBA JR LCSW
Social Worker (Clinical)
10331 STANFORD AVE
GARDEN GROVE, CA 92840
Orange County (714) 663-6000

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 Marissa De Leon's NPI number?

The NPI number for Marissa De Leon is 1679496236. It was assigned to this individual provider in the NPPES registry on July 31, 2026.

Where is Marissa De Leon located?

Marissa De Leon practices at 10331 Stanford Ave, Garden Grove, CA 92840. The listed phone number is (714) 663-6000.

What is Marissa De Leon'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 Marissa De Leon was last updated on July 31, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.