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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.

KATHY KOO-YEONSU WILLIAMS LCSW
NPI 1023946514
Social Worker - Clinical in Oakland, CA

Active since May 13, 2026
3800 COOLIDGE AVE, OAKLAND, CA 94602(510) 482-2244 Get Directions Write a Review

NPPES record last updated: August 5, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Aug 5, 2026, May 13, 2026 (2 updates tracked since 2026).

About Kathy Koo-yeonsu Williams Lcsw NPPES

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

KATHY KOO-YEONSU WILLIAMS LCSW (NPI 1023946514) is an individual clinical provider in Oakland, California, licensed in California (126548) and active in the NPI registry since May 2026. She maintains a secondary practice location in Alameda.

NPPES Registry Identity

NPI1023946514
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameKATHY KOO-YEONSU WILLIAMSCredential: LCSW
Location Address3800 COOLIDGE AVEOakland, CA 94602-3399
Mailing Address2039 Clement AveAlameda, CA 94501-1317
Phone(510) 482-2244
Sole ProprietorNo
Enumeration DateMay 13, 2026
Last NPPES UpdateAugust 5, 20262 updates tracked since enumeration
NPPES CertifiedAugust 5, 2026
✔ NPI 1023946514 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 · 126548
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.
3800 COOLIDGE AVE, Oakland, CA 94602
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Secondary Practice Location 1

Location 12039 Clement AveAlameda, CA 94501-1317 · Phone (408) 892-7203

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.

MARY ELLEN ROJAS
Marriage & Family Therapist
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
KAYLA JOANNE DOUGLAS
Student in an Organized Health Care Education/Training Program
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
MICHAELLA HELENA DEAN
Marriage & Family Therapist
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
FRED FINCH YOUTH & FAMILY SERVICES
Adult Companion
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
MR. ROGER WAYNE DANIELS LCSW
Social Worker (Clinical)
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
MS. ALEXIS V. LOWENSTEIN LMFT
Marriage & Family Therapist
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
KENDRA SUNYUNG STAFFORD ROBINSON LMFT
Marriage & Family Therapist
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 482-2244
MISS MARY KATHERINE COPE MFT
Counselor (Mental Health)
3800 COOLIDGE AVE
OAKLAND, CA 94602
Alameda County (510) 773-9629

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 Kathy Williams's NPI number?

The NPI number for Kathy Williams is 1023946514. It was assigned to this individual provider in the NPPES registry on May 13, 2026.

Where is Kathy Williams located?

Kathy Williams practices at 3800 Coolidge Ave, Oakland, CA 94602. The listed phone number is (510) 482-2244.

What is Kathy Williams'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 Kathy Williams was last updated on August 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.