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ELLEN WILLIAMS MSW, LISW-S
NPI 1104333475
Social Worker - Clinical in San Jose, CA

Active since January 08, 2018PECOS Enrolled
1799 HAMILTON AVE, SAN JOSE, CA 95125(888) 530-4415 Get Directions Write a Review

NPPES record last updated: November 6, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 6, 2025, Apr 12, 2022, Jul 8, 2019 and 2 more (5 updates tracked since 2018).

About Ellen Williams Msw, Lisw-s NPPES

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

ELLEN WILLIAMS MSW, LISW-S (NPI 1104333475) is an individual clinical provider in San Jose, California, licensed in Ohio (I.2103070) and active in the NPI registry since January 2018. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1104333475
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameELLEN WILLIAMSCredential: MSW, LISW-S
Location Address1799 HAMILTON AVESan Jose, CA 95125-5425
Mailing Address1799 Hamilton AveSan Jose, CA 95125-5425 · (888) 530-4415
Phone(888) 530-4415
Sole ProprietorNo
Enumeration DateJanuary 8, 2018
Last NPPES UpdateNovember 6, 20255 updates tracked since enumeration
NPPES CertifiedNovember 6, 2025
✔ NPI 1104333475 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in OH · I.2103070
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.
Also ListedCounselorTaxonomy 101Y00000X
Also ListedSocial WorkerTaxonomy 104100000X · License S.1802187 (OH)
Also ListedSocial Worker · SchoolTaxonomy 1041S0200X
1799 HAMILTON AVE, San Jose, CA 95125
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include MedMutual, Oscar Health Insurance, Oscar Insurance Corporation of Ohio.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ellen Williams Msw, Lisw-s is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Ellen Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

National Youth Advocate Program, Inc
2,175 mi
Community/Behavioral Health
800 MARKET AVE N STE 1600
Canton, OH 44702
  • Reassigned Medicare billing, Ohio enrollment
  • 130 clinicians in this Medicare group
NPI 1679721906 (234) 226-2350

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95125 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$0.00 typical visit price
range $70.37 – $206.04
Typical copayment $0.00 (range $17.59 – $51.51)
Most-billed visit code NA
Established Patient
$86.56 typical visit price
range $23.96 – $169.60
Typical copayment $21.64 (range $5.99 – $42.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 9

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

MS. QING MU MSTCM
Acupuncturist
1799 HAMILTON AVE, SUITE 102
SAN JOSE, CA 95125
Santa Clara County (408) 264-6800
JENNIFER TRUONG
Occupational Therapist
1799 HAMILTON AVE
SAN JOSE, CA 95125
Santa Clara County (888) 530-4415
NANCY EVELYN CHEN M.D.
Internal Medicine
1799 HAMILTON AVE
SAN JOSE, CA 95125
Santa Clara County (408) 889-1216
MRS. NAVDEEP BAMRAH NP
Nurse Practitioner (Family)
1799 HAMILTON AVE
SAN JOSE, CA 95125
Santa Clara County (866) 598-6080
WELBEHEALTH BAY AREA PACE, LLC
Program of All-Inclusive Care for the Elderly (PACE) Provider Organization
1799 HAMILTON AVE
SAN JOSE, CA 95125
Santa Clara County (650) 242-5908
SHUI MEI WU
Acupuncturist
1799 HAMILTON AVE, SUITE 102
SAN JOSE, CA 95125
Santa Clara County (408) 264-6800
VIVIAN HUYEN NGUYEN PA-C
Physician Assistant
1799 HAMILTON AVE
SAN JOSE, CA 95125
Santa Clara County (888) 530-4415
MRS. ZIPORA MARTIN-BROWN FNP-C
Nurse Practitioner (Family)
1799 HAMILTON AVE
SAN JOSE, CA 95125
Santa Clara County (888) 530-4415

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 Williams's NPI number?

The NPI number for Ellen Williams is 1104333475. It was assigned to this individual provider in the NPPES registry on January 8, 2018.

Where is Ellen Williams located?

Ellen Williams practices at 1799 Hamilton Ave, San Jose, CA 95125. The listed phone number is (888) 530-4415.

What is Ellen Williams's specialty?

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

Is Ellen Williams enrolled in Medicare?

Yes. Ellen Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ellen Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Williams reassigns Medicare benefits to National Youth Advocate Program, Inc (Canton, OH). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ellen Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ellen Williams accept?

Health plans from MedMutual, Oscar Health Insurance and Oscar Insurance Corporation of Ohio list Ellen Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Ellen Williams was last updated on November 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.