John Stephenson, PH.D.
NPI 1366509929 · Clinical Neuropsychologist · Torrance, CA
John Stephenson, PH.D. is a Clinical Neuropsychologist provider in Torrance, CA (NPI 1366509929).
Provider details
- NPI number
- 1366509929
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY16157 (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
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
Mailing address
Registry dates
- Enumerated
- 2007-01-02
- Last updated
- 2013-06-11
Frequently asked questions
- What is John Stephenson's NPI number?
- John Stephenson's National Provider Identifier (NPI) is 1366509929, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Stephenson's specialty?
- John Stephenson is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is John Stephenson located?
- John Stephenson's practice location on file with NPPES is 24520 Hawthorne Blvd, Torrance, CA 90505-6800.
- What is John Stephenson's phone number?
- The practice phone number listed in the NPPES registry for John Stephenson is (310) 428-6708.
- Is John Stephenson's NPI active?
- Yes — John Stephenson's NPI (1366509929) is active in the NPPES registry as of the last update on 2013-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.