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DR. DEIDRE ELIZABETH WILLIAMS MD
NPI 1366604209
Psychiatry & Neurology - Psychiatry in Cupertino, CA

Active since July 01, 2008PECOS Enrolled
19000 HOMESTEAD RD, BLDG 2, CUPERTINO, CA 95014(408) 366-4400(408) 366-4405 Get Directions Write a Review

NPPES record last updated: January 10, 2022. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Deidre Elizabeth Williams Md NPPES

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

DR. DEIDRE ELIZABETH WILLIAMS MD (NPI 1366604209) is an individual psychiatry provider in Cupertino, California, licensed in California (A106036) and active in the NPI registry since July 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1366604209
Entity TypeIndividualFemale
Primary Taxonomy2084P0800X
Provider Legal NameDR. DEIDRE ELIZABETH WILLIAMSCredential: MD
Location Address19000 HOMESTEAD RD, BLDG 2Cupertino, CA 95014-0712
Mailing Address1518 Nuthatch LnSunnyvale, CA 94087-4938 · (713) 542-2462
Phone(408) 366-4400
Fax(408) 366-4405
Sole ProprietorNo
Enumeration DateJuly 1, 2008
Last NPPES UpdateJanuary 10, 2022
✔ NPI 1366604209 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A106036
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
Also ListedPsychiatry & Neurology · Geriatric PsychiatryTaxonomy 2084P0805X · License A106036 (CA)
19000 HOMESTEAD RD, Cupertino, CA 95014
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Other Names 1

Other Name (5)Dr. Deidre Elizabeth Davis Md

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Deidre Elizabeth Williams Md 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95014 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
$206.04 typical visit price
range $70.37 – $206.04
Typical copayment $51.51 (range $17.59 – $51.51)
Most-billed visit code 99205
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 20

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

ASHLEY RENEE RARICK
Marriage & Family Therapist
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (408) 366-4450
LEENA V. KHANZODE MD
Psychiatry & Neurology (Psychiatry)
19000 HOMESTEAD RD, BLDG 2 , SECOND FLOOR
CUPERTINO, CA 95014
Santa Clara County (408) 366-4400
DR. ROGER JOHNSON PHD
Psychologist (Clinical)
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (408) 366-4408
MARTINA NEKOKSA CORNELL NP
Registered Nurse (Addiction (Substance Use Disorder))
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (408) 366-4200
DR. JULIA BETH HADRICKY PSY.D.
Psychologist
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (813) 382-4844
JOANNA CURIEL
Speech-Language Pathologist
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (408) 726-9689
MIHEE REDMAN RD
Dietitian, Registered
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (408) 366-4364
NIDHI KAUL M.S.W
Social Worker (Clinical)
19000 HOMESTEAD RD
CUPERTINO, CA 95014
Santa Clara County (408) 366-4400

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 Deidre Williams's NPI number?

The NPI number for Deidre Williams is 1366604209. It was assigned to this individual provider in the NPPES registry on July 1, 2008. The provider is also known as Dr. Deidre Elizabeth Davis MD.

Where is Deidre Williams located?

Deidre Williams practices at 19000 Homestead Rd Bldg 2, Cupertino, CA 95014. The listed phone number is (408) 366-4400.

What is Deidre Williams's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Deidre Williams enrolled in Medicare?

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

When was this NPI record last updated?

The NPPES record for Deidre Williams was last updated on January 10, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.