NPPES file of Aug 9, 2026

Gregory Richard Larson, PH.D.

Clinical Psychologist · San Leandro, CA

Gregory Richard Larson, PH.D. is a clinical psychologist with a practice address in San Leandro, California, and NPI 1174730618, issued on May 16, 2007. Check the license (California PSY11781, 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.

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

NPPES recordNPPES file of Aug 9, 2026
1174730618
Name
Gregory Richard Larson
Credential
PH.D.
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
PSY11781 CA
Self-reported in NPPES; status is on the state search
Practice location
333 Estudillo Ave, San Leandro, CA 94577
Phone
(510) 541-2983
Enumerated
May 16, 2007
Record last updated
Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20071002000872); 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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8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →

Also registered at 333 Estudillo Ave

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

  1. Monica Brown, MFTMarriage & Family Therapist1306040571
  2. Michael Gelbart, LCSWClinical Social Worker1992785042
  3. Noemi Gomez, MA, BCBABehavior Analyst1457715997
  4. Margaret Jones, PSY.D.Psychologist1316149404
  5. Victoria Mattimore, M.A.Behavior Analyst1093263709
  6. Tan Nguyen, D.P.M.Primary Podiatric Medicine Podiatrist1811026339

Verify Gregory Richard Larson 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 PSY11781    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

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Gregory Richard Larson among 12,647 clinical psychologist records in California

Gregory Richard Larson, PH.D. 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 fileYes · 19% of these records are
  • Graduated1987 · median 2006 among the 2,424 with a school on file
  • 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).

Clinical Psychologist providers in California

There are 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 San Leandro → Clinical Psychologist nationwide →

The 8 clinical psychologist records with the nearest ZIP codes

  1. Ryan Berman, PSY.D.San Leandro, CA 945771770649386
  2. Megan Erion, DOCTORAL CANDIDATESan Leandro, CA 945771952634230
  3. Loni Fillmore, PSYDSan Leandro, CA 945771932394459
  4. Bethany Friedman, PSY.D.San Leandro, CA 945771295984714
  5. Veronique Lee, PSY.D.San Leandro, CA 945771598951311
  6. Elizabeth Nickels, M.A., PSY.D.San Leandro, CA 945771184882607
  7. Nancy Quiggle, PHDSan Leandro, CA 945771750504122
  8. Rosemarie Ratto, PH.D.San Leandro, CA 945771649336793

Common questions

What is Gregory Richard Larson, PH.D.'s NPI number?

Gregory Richard Larson, PH.D.'s National Provider Identifier (NPI) is 1174730618, issued on May 16, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Richard Larson, PH.D. located?

The NPPES record lists a practice address at 333 Estudillo Ave, San Leandro, CA, 94577. Phone: (510) 541-2983. Providers update this record themselves, so call before visiting.

How can I verify Gregory Richard Larson, PH.D.'s license?

NPPES lists California license number PSY11781, 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.

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.