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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.

ELLEN JANE ZEMARKOWITZ LCSW
NPI 1053252957
Counselor - Mental Health in Palo Alto, CA

Active since April 03, 2026
725 WELCH RD, PALO ALTO, CA 94304(650) 497-8000 Get Directions Write a Review

NPPES record last updated: July 30, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Ellen Jane Zemarkowitz Lcsw NPPES

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

ELLEN JANE ZEMARKOWITZ LCSW (NPI 1053252957) is an individual mental health provider in Palo Alto, California, licensed in California (89459) and active in the NPI registry since April 2026.

NPPES Registry Identity

NPI1053252957
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameELLEN JANE ZEMARKOWITZCredential: LCSW
Location Address725 WELCH RDPalo Alto, CA 94304-1601
Mailing Address725 Welch RdPalo Alto, CA 94304-1601 · (650) 497-8000
Phone(650) 497-8000
Sole ProprietorNo
Enumeration DateApril 3, 2026
Last NPPES UpdateJuly 30, 2026
NPPES CertifiedJuly 30, 2026
✔ NPI 1053252957 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in CA · 89459
Also ListedSocial Worker · ClinicalTaxonomy 1041C0700X · License LCSW89459 (CA)
725 WELCH RD, Palo Alto, CA 94304
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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.

EIRI INENAGA MS, OTR/L
Occupational Therapist (Pediatrics)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8218
WENDY LEIGH ADAMS ARNP
Nurse Practitioner (Neonatal)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KEVIN WEI-HAN CHI MD
Pediatrics
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
ASHEEN RAMA MD
Anesthesiology (Pediatric Anesthesiology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
CRYSTAL LEE MACKALL MD
Pediatrics (Pediatric Hematology-Oncology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KRISTI LYNNE O'CONNOR OT
Occupational Therapist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
LAUREN GENNA ROOS NP
Nurse Practitioner
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
SHALINI MITTAL MD
Hospitalist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000

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 Ellen Zemarkowitz's NPI number?

The NPI number for Ellen Zemarkowitz is 1053252957. It was assigned to this individual provider in the NPPES registry on April 3, 2026.

Where is Ellen Zemarkowitz located?

Ellen Zemarkowitz practices at 725 Welch Rd, Palo Alto, CA 94304. The listed phone number is (650) 497-8000.

What is Ellen Zemarkowitz's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

When was this NPI record last updated?

The NPPES record for Ellen Zemarkowitz was last updated on July 30, 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.