1. Home
  2. Directory
  3. California
  4. Los Altos
  5. Marriage Family Therapist
  6. NPI Profile

ELIZABETH WILLIAMS
NPI 1992458087
Marriage & Family Therapist in Los Altos, CA

Active since January 31, 2022Opted out of Medicare · through Feb 5, 2028
340 HACIENDA WAY, LOS ALTOS, CA 94022(650) 387-5566 Get Directions Write a Review

NPPES record last updated: March 8, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 8, 2026, Jan 31, 2022 (2 updates tracked since 2022).

About Elizabeth Williams NPPES

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

ELIZABETH WILLIAMS (NPI 1992458087) is an individual marriage & family therapist in Los Altos, California, licensed in California (155225) and active in the NPI registry since January 2022. She has opted out of Medicare through February 5, 2028.

NPPES Registry Identity

NPI1992458087
Entity TypeIndividualFemale
Primary Taxonomy106H00000X
Provider Legal NameELIZABETH WILLIAMS
Location Address340 HACIENDA WAYLos Altos, CA 94022-2113
Mailing Address340 Hacienda WayLos Altos, CA 94022-2113 · (650) 387-5566
Phone(650) 387-5566
Sole ProprietorYes
Enumeration DateJanuary 31, 2022
Last NPPES UpdateMarch 8, 20262 updates tracked since enumeration
NPPES CertifiedMarch 8, 2026
✔ NPI 1992458087 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyMarriage & Family TherapistBehavioral Health & Social Service Providers
Taxonomy Code106H00000X
License✔ Licensed in CA · 155225
Definition
A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups.
340 HACIENDA WAY, Los Altos, CA 94022
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Elizabeth Williams has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from February 5, 2026 through February 5, 2028.

Opt-Out Effective DateFebruary 5, 2026
Opt-Out In Effect ThroughFebruary 5, 2028Opt-out affidavits renew automatically every two years unless cancelled

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 Elizabeth Williams's NPI number?

The NPI number for Elizabeth Williams is 1992458087. It was assigned to this individual provider in the NPPES registry on January 31, 2022.

Where is Elizabeth Williams located?

Elizabeth Williams practices at 340 Hacienda Way, Los Altos, CA 94022. The listed phone number is (650) 387-5566.

What is Elizabeth Williams's specialty?

The primary specialty registered for this NPI is Marriage & Family Therapist with taxonomy code 106H00000X.

Is Elizabeth Williams enrolled in Medicare?

No. Elizabeth Williams has opted out of Medicare through February 5, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

When was this NPI record last updated?

The NPPES record for Elizabeth Williams was last updated on March 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.