IndividualActive
John Williams, PSY.D.
NPI 1265600662 · Clinical Psychologist · Livermore, CA
John Williams, PSY.D. is a Clinical Psychologist provider in Livermore, CA (NPI 1265600662).
Provider details
- NPI number
- 1265600662
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D.
- Sex
- Male
- Sole proprietor
- No
- License
- PSY20258 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(88/100 index)
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
1080 Concannon Blvd
Suite 170
Livermore, CA 94550-6577
Phone: (925) 918-2469
Street-level locationGet directions
Mailing address
1080 Concannon Blvd
Livermore, CA 94550-6577
Registry dates
- Enumerated
- 2008-02-19
- Last updated
- 2008-02-19
Frequently asked questions
- What is John Williams's NPI number?
- John Williams's National Provider Identifier (NPI) is 1265600662, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Williams's specialty?
- John Williams is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is John Williams located?
- John Williams's practice location on file with NPPES is 1080 Concannon Blvd, Livermore, CA 94550-6577.
- What is John Williams's phone number?
- The practice phone number listed in the NPPES registry for John Williams is (925) 918-2469.
- Is John Williams's NPI active?
- Yes — John Williams's NPI (1265600662) is active in the NPPES registry as of the last update on 2008-02-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.