IndividualActive
William Gerwin, PH.D.
NPI 1144469941 · Psychologist · Kentfield, CA
William Gerwin, PH.D. is a Psychologist provider in Kentfield, CA (NPI 1144469941).
Provider details
- NPI number
- 1144469941
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY18405 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(86/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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
1036 Sir Francis Drake Blvd
Kentfield, CA 94904-1427
Phone: (415) 721-7290
Fax: (415) 721-7290
Approximate (ZIP-level) locationGet directions
Mailing address
Po Box 678
Corte Madera, CA 94976-0678
Registry dates
- Enumerated
- 2009-02-18
- Last updated
- 2009-02-18
Frequently asked questions
- What is William Gerwin's NPI number?
- William Gerwin's National Provider Identifier (NPI) is 1144469941, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gerwin's specialty?
- William Gerwin is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is William Gerwin located?
- William Gerwin's practice location on file with NPPES is 1036 Sir Francis Drake Blvd, Kentfield, CA 94904-1427.
- What is William Gerwin's phone number?
- The practice phone number listed in the NPPES registry for William Gerwin is (415) 721-7290.
- Is William Gerwin's NPI active?
- Yes — William Gerwin's NPI (1144469941) is active in the NPPES registry as of the last update on 2009-02-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.