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AMBER WILLIAMS PHD
NPI 1801381447
Psychologist - Clinical Child & Adolescent in Oakland, CA

Active since June 26, 2018PECOS Enrolled
747 52ND ST, OAKLAND, CA 94609(510) 428-3885(510) 579-7199 Get Directions Write a Review

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

Record update history: May 6, 2026, Jun 10, 2025, Jul 10, 2019 and 1 more (4 updates tracked since 2018).

About Amber Williams Phd NPPES

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

AMBER WILLIAMS PHD (NPI 1801381447) is an individual clinical child & adolescent provider in Oakland, California, licensed in California (PSY33437) and active in the NPI registry since June 2018. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801381447
Entity TypeIndividualFemale
Primary Taxonomy103TC2200X
Provider Legal NameAMBER WILLIAMSCredential: PHD
Location Address747 52ND STOakland, CA 94609-1809
Mailing Address710 S BroadwayWalnut Creek, CA 94596-5294 · (925) 295-4145
Phone(510) 428-3885
Fax(510) 579-7199
Sole ProprietorNo
Enumeration DateJune 26, 2018
Last NPPES UpdateMay 6, 20264 updates tracked since enumeration
NPPES CertifiedMay 6, 2026
✔ NPI 1801381447 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychologist · Clinical Child & AdolescentBehavioral Health & Social Service Providers
Taxonomy Code103TC2200X
License✔ Licensed in CA · PSY33437
Definition
A psychologist who develops and applies scientific knowledge to the delivery of psychological services to infants, toddlers, children and adolescents within their social context. Of particular importance to the specialty of clinical child psychology is an understanding of the basic psychological needs of children and adolescents, and how the family and other social contexts influence the socio-emotional adjustment, cognitive development, behavioral adaptation and health status of children and adolescents.
Also ListedPsychologist · Addiction (Substance Use Disorder)Taxonomy 103TA0400X · License PSY33437 (CA)
747 52ND ST, Oakland, CA 94609
Open in Google Maps ↗

Other Names 1

Former Name (1)Amber Holdren

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Amber Williams Phd 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 Amber Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
8.6 mi
Internal Medicine
901 NEVIN
Richmond, CA 94801
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1235226531 (510) 307-1555

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

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.

MRS. SHERYL LEE GARCIA RN
Registered Nurse (Pediatrics)
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3885
ERICA TRINGALE N.P,
Nurse Practitioner (Pediatrics)
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3373
MRS. NATALIE PLOTKIN MS, ACPNP
Pediatrics (Pediatric Hematology-Oncology)
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3484
REBECCA ROMANOV MD
Pediatrics
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3331
SHELLEY ANNE BULL CPNP-PC
Nurse Practitioner (Pediatrics)
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3885
KARIDA ADETORO
Student in an Organized Health Care Education/Training Program
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3885
ANNIE ROQUE
Nurse Practitioner (Pediatrics)
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-4418
CHILDREN'S HOSPITAL & RESEARCH CENTER AT OAKLAND
General Acute Care Hospital
747 52ND ST
OAKLAND, CA 94609
Alameda County (510) 428-3885

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 Amber Williams's NPI number?

The NPI number for Amber Williams is 1801381447. It was assigned to this individual provider in the NPPES registry on June 26, 2018. The provider is also known as Amber Holdren.

Where is Amber Williams located?

Amber Williams practices at 747 52nd St, Oakland, CA 94609. The listed phone number is (510) 428-3885.

What is Amber Williams's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical Child & Adolescent, with taxonomy code 103TC2200X.

Is Amber Williams enrolled in Medicare?

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

Which organization bills Medicare for Amber Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Amber Williams reassigns Medicare benefits to Permanente Medical Group Inc (Richmond, CA). 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 Amber Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Amber Williams was last updated on May 6, 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.