DR. GREGORY ANTHONY FONZO PH.D.
NPI 1174858070
Psychologist - Clinical in San Francisco, CA
About Dr. Gregory Anthony Fonzo Ph.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GREGORY ANTHONY FONZO PH.D. (NPI 1174858070) is an individual clinical provider in San Francisco, California, licensed in California (PSY27812) and active in the NPI registry since October 2009. He is enrolled in Medicare PECOS and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Gregory Anthony Fonzo Ph.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Gregory Fonzo reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Austin, TX 78712
- Reassigned Medicare billing, Texas enrollment
- 294 clinicians in this Medicare group
Austin, TX 78712
- Reassigned Medicare billing, Texas enrollment
- 208 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94102 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94102
SAN FRANCISCO, CA 94102
SAN FRANCISCO, CA 94102
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gregory Fonzo's NPI number?
The NPI number for Gregory Fonzo is 1174858070. It was assigned to this individual provider in the NPPES registry on October 9, 2009.
Where is Gregory Fonzo located?
Gregory Fonzo practices at 870 Market St Suite 958, San Francisco, CA 94102. The listed phone number is (650) 394-6586.
What is Gregory Fonzo's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Gregory Fonzo enrolled in Medicare?
Yes. Gregory Fonzo is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Gregory Fonzo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Fonzo reassigns Medicare benefits to 2 organizations: The University Of Texas At Austin (Austin, TX) and University Of Texas At Austin Dell Medical School (Austin, TX). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Fonzo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gregory Fonzo accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 4 other insurers list Gregory Fonzo as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Gregory Fonzo was last updated on January 11, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Gregory Anthony Fonzo, PH.D. · NPI 1174858070
Clinical provider in San Francisco, California. Individual provider, active in the CMS NPPES registry since October 9, 2009.
## Identity
- **NPI:** 1174858070 (Entity type: Individual)
- **Enumerated:** October 9, 2009
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** PSY27812 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 870 MARKET ST, SUITE 958, San Francisco, CA 94102-3099
- **Phone:** (650) 394-6586
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): The University Of Texas At Austin (NPI 1073032546, Austin, TX); University Of Texas At Austin Dell Medical School (NPI 1073066239, Austin, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** January 11, 2016
---
Source: [NPI Profile](https://npiprofile.com/npi/1174858070) · Data from the CMS NPPES public registry.