Holly Williamsen, MSW, LCSW
NPI 1750405932 · Clinical Social Worker · North Hollywood, CA
Holly Williamsen, MSW, LCSW is a Clinical Social Worker provider in North Hollywood, CA (NPI 1750405932).
Provider details
- NPI number
- 1750405932
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- MSW, LCSW
- Sex
- Female
- Sole proprietor
- Yes
- License
- 24179 (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
19 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
- 2007-03-16
- Last updated
- 2013-05-06
Frequently asked questions
- What is Holly Williamsen's NPI number?
- Holly Williamsen's National Provider Identifier (NPI) is 1750405932, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Holly Williamsen's specialty?
- Holly Williamsen is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Holly Williamsen located?
- Holly Williamsen's practice location on file with NPPES is 10526 Dubnoff Way, North Hollywood, CA 91606-3921.
- What is Holly Williamsen's phone number?
- The practice phone number listed in the NPPES registry for Holly Williamsen is (310) 755-4950.
- Is Holly Williamsen's NPI active?
- Yes — Holly Williamsen's NPI (1750405932) is active in the NPPES registry as of the last update on 2013-05-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.