William Mares
NPI 1376914960 · Clinical Social Worker · Fremont, CA
William Mares is a Clinical Social Worker provider in Fremont, CA (NPI 1376914960).
Provider details
- NPI number
- 1376914960
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 66815 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
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
10 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
- 2015-10-08
- Last updated
- 2022-05-19
- Certified
- 2022-05-19
Frequently asked questions
- What is William Mares's NPI number?
- William Mares's National Provider Identifier (NPI) is 1376914960, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mares's specialty?
- William Mares is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is William Mares located?
- William Mares's practice location on file with NPPES is 39199 Liberty St, Fremont, CA 94538-1501.
- What is William Mares's phone number?
- The practice phone number listed in the NPPES registry for William Mares is (209) 303-7341.
- Is William Mares's NPI active?
- Yes — William Mares's NPI (1376914960) is active in the NPPES registry as of the last update on 2022-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.