John Nickens, PHD
NPI 1427115542 · Clinical Psychologist · Oakland, CA
Enrolled with Medicare as Order and Referring Only - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Nickens, PHD is a Clinical Psychologist provider in Oakland, CA (NPI 1427115542).
Provider details
- NPI number
- 1427115542
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY14670 (CA)
Specialties & taxonomies
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
- 2007-07-08
Frequently asked questions
- What is John Nickens's NPI number?
- John Nickens's National Provider Identifier (NPI) is 1427115542, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Nickens's specialty?
- John Nickens is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is John Nickens located?
- John Nickens's practice location on file with NPPES is 465 34th St, Oakland, CA 94609-2815.
- What is John Nickens's phone number?
- The practice phone number listed in the NPPES registry for John Nickens is (510) 287-9456.
- Does John Nickens accept Medicare?
- John Nickens is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Nickens's NPI active?
- Yes — John Nickens's NPI (1427115542) 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.