Gregory Anthony Fonzo, PH.D.
Clinical Psychologist · San Francisco, CA
Gregory Anthony Fonzo, PH.D. is a clinical psychologist with a practice address in San Francisco, California, and NPI 1174858070, issued on Oct 9, 2009. Check the license (California PSY27812, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory Anthony Fonzo
- Credential
- PH.D.
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- PSY27812 CA
Self-reported in NPPES; status is on the state search - Practice location
- 870 Market St, San Francisco, CA 94102
- Phone
- (650) 394-6586
- Enumerated
- Oct 9, 2009
- Record last updated
- Jan 11, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20191105002198); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →
Also registered at 870 Market St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Anthony Fonzo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY27812Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 2 group practices
- The University OF Texas AT AustinAustin, TX
- University OF Texas AT Austin Dell Medical SchoolAustin, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Anthony Fonzo among 12,647 clinical psychologist records in California
Gregory Anthony Fonzo, 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. Its NPI, issued in 2009, is newer than 49% of them.
- NPI issued2009 · 49% of these records are older, 46% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated2013 · median 2006 among the 2,424 with a school on file
- Record last updated2016 · 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).
802 clinical psychologist records list a practice address in San Francisco
They are 802 of the 38,143 NPPES records with a practice address in San Francisco, and 12,647 clinical psychologist records in California.
All 12,647 in California → Every provider in San Francisco → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Michael Baum, MFTSan Francisco, CA 941021992894612
- Stacey Hart, PH.D.San Francisco, CA 941021548282023
- Mark Jensen, PSY.D.San Francisco, CA 941021871693457
- Lisa Kalich, PSY.D.San Francisco, CA 941021700831815
- Steven Kohlstrom, PH.D.San Francisco, CA 941021841209251
- Elly Lin, PSY.D.San Francisco, CA 941021992878342
- Jacinda Marshall, PSY DSan Francisco, CA 941021205991932
- Lutfiah Milhem, PH.D.San Francisco, CA 941021518957216
Common questions
What is Gregory Anthony Fonzo, PH.D.'s NPI number?
Gregory Anthony Fonzo, PH.D.'s National Provider Identifier (NPI) is 1174858070, issued on Oct 9, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Anthony Fonzo, PH.D. located?
The NPPES record lists a practice address at 870 Market St, San Francisco, CA, 94102. Phone: (650) 394-6586. Providers update this record themselves, so call before visiting.
How can I verify Gregory Anthony Fonzo, PH.D.'s license?
NPPES lists California license number PSY27812, 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.
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.