Mary Williamson, LCSW
NPI 1871777631 · Clinical Social Worker · Sacramento, CA
Mary Williamson, LCSW is a Clinical Social Worker provider in Sacramento, CA (NPI 1871777631).
Provider details
- NPI number
- 1871777631
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
- License
- 24015 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-12-28
- Last updated
- 2008-01-03
Frequently asked questions
- What is Mary Williamson's NPI number?
- Mary Williamson's National Provider Identifier (NPI) is 1871777631, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Williamson's specialty?
- Mary Williamson is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mary Williamson located?
- Mary Williamson's practice location on file with NPPES is 3331 Power Inn Rd, Sacramento, CA 95826-3889.
- What is Mary Williamson's phone number?
- The practice phone number listed in the NPPES registry for Mary Williamson is (916) 875-9980.
- Is Mary Williamson's NPI active?
- Yes — Mary Williamson's NPI (1871777631) is active in the NPPES registry as of the last update on 2008-01-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.