John Thomas Nickens, PHD
Clinical Psychologist · Oakland, CA
John Thomas Nickens, PHD is a clinical psychologist with a practice address in Oakland, California, and NPI 1427115542, issued on Jan 2, 2007. Check the license (California PSY14670, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Thomas Nickens
- Credential
- PHD
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- PSY14670 CA
Self-reported in NPPES; status is on the state search - Practice location
- 465 34TH St, Oakland, CA 94609
- Phone
- (510) 287-9456
- Enumerated
- Jan 2, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (519) 382-9716
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Thomas Nickens in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY14670Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Thomas Nickens among 12,647 clinical psychologist records in California
John Thomas Nickens, PHD is one of 12,647 clinical psychologist records with a practice address in California. 9% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 20% of them.
- NPI issued2007 · 20% of these records are older, 57% newer
- In a Medicare fileNo · 9% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2007 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
354 clinical psychologist records list a practice address in Oakland
They are 354 of the 18,558 NPPES records with a practice address in Oakland, and 12,647 clinical psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 12,647 in California → Every provider in Oakland → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Gregory Alter, PH.D.Oakland, CA 946091528168366
- Valerie Bellas, PH.D.Oakland, CA 946091578617692
- Paul Guillory, PH.D.Oakland, CA 946091811055718
- Judith Libow, PH.D.Oakland, CA 946091205982139
- Nancy Liu, PSY.D.Oakland, CA 946091518012533
- Anne Marshall, PH.D.Oakland, CA 946091710084785
- Melissa Newman, PSY.D.Oakland, CA 946091316066400
- Karla Sagramoso, PHDOakland, CA 946091649213307
Common questions
What is John Thomas Nickens, PHD's NPI number?
John Thomas Nickens, PHD's National Provider Identifier (NPI) is 1427115542, issued on Jan 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Thomas Nickens, PHD located?
The NPPES record lists a practice address at 465 34TH St, Oakland, CA, 94609. Phone: (510) 287-9456. Providers update this record themselves, so call before visiting.
How can I verify John Thomas Nickens, PHD's license?
NPPES lists California license number PSY14670, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.