NPPES file of Aug 9, 2026

Clarence M. Leung, PHD

Clinical Psychologist · Glendora, CA

Clarence M. Leung, PHD is a clinical psychologist with a practice address in Glendora, California, and NPI 1134273543, issued on Jan 22, 2007. Check the license (California PSY 20904, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1134273543
Name
Clarence M. Leung
Credential
PHD
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
PSY 20904 CA
Self-reported in NPPES; status is on the state search
Practice location
415 W Route 66, Glendora, CA 91740
Phone
(626) 963-4467
Enumerated
Jan 22, 2007
Record last updated
Oct 4, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(626) 963-9543
Medicaid ID
PSY209040 CA
Medicare enrollment
Enrolled (PECOS I20170927002425); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 415 W Route 66

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

  1. Ghada Al-Asadi, MDPsychiatry Physician1598875239
  2. Maggie Ateia, PSY.D.Clinical Psychologist1003056680
  3. Richard Biebuyck, M.D.Psychiatry Physician1770521734
  4. Piedad Castrillon, L.M.F.T.Marriage & Family Therapist1265899553
  5. John Cullen, MFTMarriage & Family Therapist1104035260
  6. George Ferenczi, M.D.Gastroenterology Physician1932270105

Verify Clarence M. Leung in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license PSY 20904    Check 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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Dr Jacob And Associates IncGlendora, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

28 clinical psychologist records list a practice address in Glendora

They are 28 of the 921 NPPES records with a practice address in Glendora, and 12,647 clinical psychologist records in California.

All 28 in Glendora → All 12,647 in California → Every provider in Glendora →

Other clinical psychologist records in California

  1. Tanya Aaen, PH.D.Martinez, CA1477518561
  2. Jack Aamot, PSY.D.Napa, CA1770711210
  3. Brian Abary, PSY.DLos Angeles, CA1538354832
  4. Tatevik Abaryan, PH.D.Pacoima, CA1952682619
  5. Liana Abascal, PH.D.San Diego, CA1073740569
  6. Jessica Abdalla, PHDWalnut Creek, CA1558069211
  7. Mohamed Abdallah, PSY.DEl Centro, CA1912430851
  8. Megan Abdolrashidi, PSYDGilroy, CA1093293094
  9. Keri Abdullah, PH.D.San Diego, CA1699840587
  10. Qutayba Abdullatif, PH.D.Pasadena, CA1134667751

Common questions

What is Clarence M. Leung, PHD's NPI number?

Clarence M. Leung, PHD's National Provider Identifier (NPI) is 1134273543, issued on Jan 22, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Clarence M. Leung, PHD located?

The NPPES record lists a practice address at 415 W Route 66, Glendora, CA, 91740. Phone: (626) 963-4467. Providers update this record themselves, so call before visiting.

How can I verify Clarence M. Leung, PHD's license?

NPPES lists California license number PSY 20904, 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. Medicare files from data.cms.gov. 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.