William Stewart, MSW
NPI 1891280947 · Clinical Social Worker · Hayward, CA
William Stewart, MSW is a Clinical Social Worker provider in Hayward, CA (NPI 1891280947).
Provider details
- NPI number
- 1891280947
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- MSW
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Social Worker104100000X
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
7 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2018-06-29
- Last updated
- 2018-06-29
Frequently asked questions
- What is William Stewart's NPI number?
- William Stewart's National Provider Identifier (NPI) is 1891280947, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Stewart's specialty?
- William Stewart is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is William Stewart located?
- William Stewart's practice location on file with NPPES is 2235 Dexter Way, Hayward, CA 94541-4441.
- What is William Stewart's phone number?
- The practice phone number listed in the NPPES registry for William Stewart is (510) 520-4399.
- Is William Stewart's NPI active?
- Yes — William Stewart's NPI (1891280947) is active in the NPPES registry as of the last update on 2018-06-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.