NPPES file of Aug 9, 2026

Claire Oxtoby, PHD

Psychologist · Rancho Cucamonga, CA

Claire Oxtoby, PHD is a psychologist with a practice address in Rancho Cucamonga, California, and NPI 1154679868, issued on Aug 28, 2012. Check the license with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1154679868
Name
Claire Oxtoby
Credential
PHD
Primary taxonomy
Psychologist 103T00000X
Practice location
8300 Utica Ave Ste 245, Rancho Cucamonga, CA 91730
Phone
(910) 297-1740
Enumerated
Aug 28, 2012
Record last updated
Sep 16, 2020 (not updated in 6 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest psychologist records → All 7,304 in California → Look up another NPI →

Also registered at 8300 Utica Ave Ste 245

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Sepideh Adhami, PSY.D.Psychologist1124451307
  2. Desiree Ayala, LMFTMarriage & Family Therapist1922751908
  3. Jenss Chang, PHDClinical Psychologist1942494786
  4. Daniel Chung, PSY.D.Psychologist1578895348
  5. Damon Corgiat, PH.D.Clinical Psychologist1205223849
  6. Brittany Dey, PSYDPsychologist1437937067

Verify Claire Oxtoby in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

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Claire Oxtoby among 7,304 psychologist records in California

Claire Oxtoby, PHD is one of 7,304 psychologist records with a practice address in California. 6% 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 2012, is newer than 53% of them.

  • NPI issued2012 · 53% of these records are older, 43% newer
  • In a Medicare fileNo · 6% of these records are
  • In the CMS Doctors and Clinicians fileNo · 14% of these records are
  • Record last updated2020 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Psychologist providers in California

There are 7,304 psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 7,304 in California → Every provider in Rancho Cucamonga → Psychologist nationwide →

The 8 psychologist records with the nearest ZIP codes

  1. Daniel Chung, PSY.D.Rancho Cucamonga, CA 917301578895348
  2. Jerry Goffman, PHD.Rancho Cucamonga, CA 917301124137765
  3. Timothy Gunn, PSY.D.Rancho Cucamonga, CA 917301356466973
  4. Nina Hudspeth, PSYDRancho Cucamonga, CA 917301962696039
  5. Pean LaiRancho Cucamonga, CA 917301407037575
  6. Stefanie Lockhart-Pettaway, PSY.D, MSWRancho Cucamonga, CA 917301497934871
  7. John Quinlan, PSYDRancho Cucamonga, CA 917301821363896
  8. Deborah Seffinger, PHDRancho Cucamonga, CA 917301245478692

Common questions

What is Claire Oxtoby, PHD's NPI number?

Claire Oxtoby, PHD's National Provider Identifier (NPI) is 1154679868, issued on Aug 28, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Claire Oxtoby, PHD located?

The NPPES record lists a practice address at 8300 Utica Ave Ste 245, Rancho Cucamonga, CA, 91730. Phone: (910) 297-1740. Providers update this record themselves, so call before visiting.

How can I verify Claire Oxtoby, PHD's license?

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.