Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARGAUX HEWITT-SLADE CADC-I
NPI 1629421631
Counselor - Addiction (Substance Use Disorder) in Castro Valley, CA

Q: What is Margaux Hewitt-slade's NPI number?

The NPI number for Margaux Hewitt-slade is 1629421631. It was assigned to this individual provider in the NPPES registry on July 14, 2016.

Q: What is Margaux Hewitt-slade's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

Active since July 14, 2016

20880 BAKER RD, CASTRO VALLEY, CA 94546(510) 581-5626 Get Directions Write a Review

NPPES record last updated: October 7, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 7, 2026, Jul 29, 2021, Jul 14, 2016 (3 updates tracked since 2016).

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About Margaux Hewitt-slade Cadc-i NPPES

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

MARGAUX HEWITT-SLADE CADC-I (NPI 1629421631) is an individual addiction (substance use disorder) provider in Castro Valley, California, licensed in California (CI33080621) and active in the NPI registry since July 2016.

NPPES Registry Identity

NPI1629421631

Entity TypeIndividualFemale

Primary Taxonomy101YA0400X

Provider Legal NameMARGAUX HEWITT-SLADECredential: CADC-I

Location Address20880 BAKER RDCastro Valley, CA 94546-5729

Mailing Address20880 Baker Rd Ste 200Castro Valley, CA 94546-5729 · (510) 213-8601

Phone(510) 581-5626

Sole ProprietorNo

Enumeration DateJuly 14, 2016

Last NPPES UpdateOctober 7, 20263 updates tracked since enumeration

NPPES CertifiedOctober 7, 2026

✔ NPI 1629421631 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers

Taxonomy Code101YA0400X

License✔ Licensed in CA · CI33080621

20880 BAKER RD, Castro Valley, CA 94546

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Other Providers at the Same Location NPPES 4

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

RILEY RECOVERY CENTERS

Clinic/Center (Rehabilitation, Substance Use Disorder)

20880 BAKER RD
CASTRO VALLEY, CA 94546

Alameda County (310) 879-9516

SOPHORA ACHESON

Counselor (Mental Health)

20880 BAKER RD
CASTRO VALLEY, CA 94546

Alameda County (510) 581-5626

RUBY'S PLACE

Community Based Residential Treatment Facility, Mental Illness

20880 BAKER RD
CASTRO VALLEY, CA 94546

Alameda County (916) 878-9458

GINA MERLENE TYRA FNP-C

Nurse Practitioner (Community Health)

20880 BAKER RD
CASTRO VALLEY, CA 94546

Alameda County (510) 581-5646

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 Margaux Hewitt-slade's NPI number?

The NPI number for Margaux Hewitt-slade is 1629421631. It was assigned to this individual provider in the NPPES registry on July 14, 2016.

Where is Margaux Hewitt-slade located?

Margaux Hewitt-slade practices at 20880 Baker Rd, Castro Valley, CA 94546. The listed phone number is (510) 581-5626.

What is Margaux Hewitt-slade's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

When was this NPI record last updated?

The NPPES record for Margaux Hewitt-slade was last updated on October 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.