1. Home
  2. Directory
  3. California
  4. Sacramento
  5. Social Worker
  6. NPI Profile

MARY KATHERINE WILLIAMSON LCSW
NPI 1871777631
Social Worker - Clinical in Sacramento, CA

Active since December 28, 2007
3331 POWER INN RD, SUITE 170, SACRAMENTO, CA 95826(916) 875-9980(916) 875-9970 Get Directions Write a Review

NPPES record last updated: January 3, 2008. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mary Katherine Williamson Lcsw NPPES

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

MARY KATHERINE WILLIAMSON LCSW (NPI 1871777631) is an individual clinical provider in Sacramento, California, licensed in California (24015) and active in the NPI registry since December 2007.

NPPES Registry Identity

NPI1871777631
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMARY KATHERINE WILLIAMSONCredential: LCSW
Location Address3331 POWER INN RD, SUITE 170Sacramento, CA 95826-3889
Mailing Address3331 Power Inn Rd, Suite 170Sacramento, CA 95826-3889 · (916) 875-9980 · Fax (916) 875-9970
Phone(916) 875-9980
Fax(916) 875-9970
Sole ProprietorNo
Enumeration DateDecember 28, 2007
Last NPPES UpdateJanuary 3, 2008
✔ NPI 1871777631 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in CA · 24015
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
3331 POWER INN RD, Sacramento, CA 95826
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

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.

BEVERLY BUDIG
Case Management
3331 POWER INN RD, SUITE 450
SACRAMENTO, CA 95826
Sacramento County (916) 876-7624
MISS CHRISTINA EVE PROVONSHA M.S.
Marriage & Family Therapist
3331 POWER INN RD, SUITE 140
SACRAMENTO, CA 95826
Sacramento County (916) 875-1183
SHANNON ALMEIDA
Licensed Psychiatric Technician
3331 POWER INN RD
SACRAMENTO, CA 95826
Sacramento County (951) 517-6038
MR. KYLE CURTIS MONSON ESQ.
Case Manager/Care Coordinator
3331 POWER INN RD, SUITE 450
SACRAMENTO, CA 95826
Sacramento County (916) 875-3098
JANE THOMAS
Registered Nurse (Community Health)
3331 POWER INN RD, SUITE 220
SACRAMENTO, CA 95826
Sacramento County (916) 875-4853
MR. STEVEN PETREE
Case Manager/Care Coordinator
3331 POWER INN RD
SACRAMENTO, CA 95826
Sacramento County (916) 875-4467
SACRAMENTO COUNTY
Case Management
3331 POWER INN RD
SACRAMENTO, CA 95826
Sacramento County (916) 875-4467
WILLIAM GARY NICHOLS LCSW
Social Worker (Clinical)
3331 POWER INN RD, 170
SACRAMENTO, CA 95826
Sacramento County (916) 875-9889

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 Mary Williamson's NPI number?

The NPI number for Mary Williamson is 1871777631. It was assigned to this individual provider in the NPPES registry on December 28, 2007.

Where is Mary Williamson located?

Mary Williamson practices at 3331 Power Inn Rd Suite 170, Sacramento, CA 95826. The listed phone number is (916) 875-9980.

What is Mary Williamson's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

What insurance does Mary Williamson accept?

Health plans from Providence Health Plan list Mary Williamson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mary Williamson was last updated on January 3, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.