KATHRYN FAY MD
NPI 1033509740
Obstetrics & Gynecology in San Francisco, CA
About Kathryn Fay Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KATHRYN FAY MD (NPI 1033509740) is an individual obstetrics & gynecology provider in San Francisco, California, licensed in California (C204167) and active in the NPI registry since February 2015. She is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Kathryn Fay Md 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
4Medicare enrollment records show Kathryn Fay reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 761 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94115 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 94115
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 Kathryn Fay's NPI number?
The NPI number for Kathryn Fay is 1033509740. It was assigned to this individual provider in the NPPES registry on February 2, 2015.
Where is Kathryn Fay located?
Kathryn Fay practices at 2356 Sutter St, San Francisco, CA 94115. The listed phone number is (415) 353-3400.
What is Kathryn Fay's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Kathryn Fay enrolled in Medicare?
Yes. Kathryn Fay 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 Kathryn Fay's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kathryn Fay reassigns Medicare benefits to 4 organizations: University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), Ucsf Dept Of Surgery (San Francisco, CA) and Brigham & Womens Physicians Organization Inc (Boston, MA). 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 Kathryn Fay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Kathryn Fay was last updated on October 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months 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.
# Kathryn Fay, MD · NPI 1033509740
Obstetrics & Gynecology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since February 2, 2015.
## Identity
- **NPI:** 1033509740 (Entity type: Individual)
- **Enumerated:** February 2, 2015
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** C204167 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2356 SUTTER ST, San Francisco, CA 94115-3006
- **Phone:** (415) 353-3400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Ucsf Dept Of Surgery (NPI 1477627537, San Francisco, CA); Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** October 18, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1033509740) · Data from the CMS NPPES public registry.