Gregory Fonzo, PH.D.
NPI 1174858070 · Clinical Psychologist · San Francisco, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Fonzo, PH.D. is a Clinical Psychologist provider in San Francisco, CA (NPI 1174858070).
Provider details
- NPI number
- 1174858070
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY27812 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-10-09
- Last updated
- 2016-01-11
Frequently asked questions
- What is Gregory Fonzo's NPI number?
- Gregory Fonzo's National Provider Identifier (NPI) is 1174858070, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Fonzo's specialty?
- Gregory Fonzo is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Gregory Fonzo located?
- Gregory Fonzo's practice location on file with NPPES is 870 Market St, San Francisco, CA 94102-3099.
- What is Gregory Fonzo's phone number?
- The practice phone number listed in the NPPES registry for Gregory Fonzo is (650) 394-6586.
- Does Gregory Fonzo accept Medicare?
- Gregory Fonzo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Fonzo's NPI active?
- Yes — Gregory Fonzo's NPI (1174858070) is active in the NPPES registry as of the last update on 2016-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.