1. Home
  2. Directory
  3. California
  4. Santa Monica
  5. Counselor
  6. NPI Profile

GREGORY DEMITRI WILLIAMS
NPI 1982495818
Counselor - Addiction (Substance Use Disorder) in Santa Monica, CA

Active since May 12, 2025
1871 9TH ST, SANTA MONICA, CA 90404(310) 314-6200 Get Directions Write a Review

NPPES record last updated: April 27, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Apr 27, 2026, May 12, 2025 (2 updates tracked since 2025).

About Gregory Demitri Williams NPPES

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

GREGORY DEMITRI WILLIAMS (NPI 1982495818) is an individual addiction (substance use disorder) provider in Santa Monica, California, licensed in California (225855) and active in the NPI registry since May 2025. He maintains a secondary practice location in San Fernando.

NPPES Registry Identity

NPI1982495818
Entity TypeIndividualMale
Primary Taxonomy101YA0400X
Provider Legal NameGREGORY DEMITRI WILLIAMS
Location Address1871 9TH STSanta Monica, CA 90404-4501
Mailing Address8830 Moonbeam AvePanorama City, CA 91402-2622 · (747) 500-9405
Phone(310) 314-6200
Sole ProprietorYes
Enumeration DateMay 12, 2025
Last NPPES UpdateApril 27, 20262 updates tracked since enumeration
NPPES CertifiedApril 27, 2026
✔ NPI 1982495818 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 · 225855
1871 9TH ST, Santa Monica, CA 90404
Open in Google Maps ↗

Secondary Practice Location 1

Location 1762 Griswold AveSan Fernando, CA 91340-2105 · Phone (747) 500-9405

Other Providers at the Same Location NPPES 17

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

ANISE BROWN
Licensed Vocational Nurse
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200
LAURA SMITH
Counselor (Addiction (Substance Use Disorder))
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200
DAVID MORTLEY
Counselor (Addiction (Substance Use Disorder))
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200
CLAUDIA EVELYN GUTIERREZ
Licensed Vocational Nurse
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200
TIMOTHY GARRETT IVERSON REGISTERED NURSE
Registered Nurse (Addiction (Substance Use Disorder))
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (646) 298-9614
PATRICIA DENISE BAGLEY
Counselor (Addiction (Substance Use Disorder))
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200
WHITNEY KAY COLLINSWORTH
Nurse Practitioner (Psychiatric/Mental Health)
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200
JASON ALEXANDER HERNANDEZ
Counselor (Addiction (Substance Use Disorder))
1871 9TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 314-6200

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 Gregory Williams's NPI number?

The NPI number for Gregory Williams is 1982495818. It was assigned to this individual provider in the NPPES registry on May 12, 2025.

Where is Gregory Williams located?

Gregory Williams practices at 1871 9th St, Santa Monica, CA 90404. The listed phone number is (310) 314-6200.

What is Gregory Williams'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 Gregory Williams was last updated on April 27, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.