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Martin Williams, PH.D.
NPI 1235200957 · Clinical Psychologist · Cupertino, CA
Martin Williams, PH.D. is a Clinical Psychologist provider in Cupertino, CA (NPI 1235200957).
Provider details
- NPI number
- 1235200957
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- PSY 4642 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(90/100 index)
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
19000 Homestead Rd
Cupertino, CA 95014-0712
Phone: (408) 366-4409
Street-level locationGet directions
Mailing address
19000 Homestead Rd
Cupertino, CA 95014-0712
Registry dates
- Enumerated
- 2006-11-13
- Last updated
- 2007-07-08
Frequently asked questions
- What is Martin Williams's NPI number?
- Martin Williams's National Provider Identifier (NPI) is 1235200957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Martin Williams's specialty?
- Martin Williams is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Martin Williams located?
- Martin Williams's practice location on file with NPPES is 19000 Homestead Rd, Cupertino, CA 95014-0712.
- What is Martin Williams's phone number?
- The practice phone number listed in the NPPES registry for Martin Williams is (408) 366-4409.
- Is Martin Williams's NPI active?
- Yes — Martin Williams's NPI (1235200957) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.