ALEXANDRA ELIZABETH FLESSEL MD
NPI 1003493701
Obstetrics & Gynecology in San Mateo, CA
About Alexandra Elizabeth Flessel Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDRA ELIZABETH FLESSEL MD (NPI 1003493701) is an individual obstetrics & gynecology provider in San Mateo, California, licensed in California (A203951) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Wayne State University School Of Medicine (2021).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
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
Alexandra Elizabeth Flessel 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 Alexandra Flessel 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
- 761 clinicians in this Medicare group
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
Oakland, CA 94609
- Reassigned Medicare billing, California enrollment
- 118 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 94401 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 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Alexandra Flessel's NPI number?
The NPI number for Alexandra Flessel is 1003493701. It was assigned to this individual provider in the NPPES registry on March 27, 2021.
Where is Alexandra Flessel located?
Alexandra Flessel practices at 136 N San Mateo Dr Ste 101, San Mateo, CA 94401. The listed phone number is (650) 344-1114.
What is Alexandra Flessel's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Alexandra Flessel enrolled in Medicare?
Yes. Alexandra Flessel 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 Alexandra Flessel's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexandra Flessel reassigns Medicare benefits to 4 organizations: Ucsf Dept Of Surgery (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Ucsf Health Medical Foundation (Oakland, CA). 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 Alexandra Flessel'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 Alexandra Flessel was last updated on August 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Alexandra Elizabeth Flessel, MD · NPI 1003493701
Obstetrics & Gynecology physician in San Mateo, California. Individual provider, active in the CMS NPPES registry since March 27, 2021.
## Identity
- **NPI:** 1003493701 (Entity type: Individual)
- **Enumerated:** March 27, 2021
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** A203951 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 136 N SAN MATEO DR STE 101, San Mateo, CA 94401-2779
- **Phone:** (650) 344-1114
## 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): Ucsf Dept Of Surgery (NPI 1477627537, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Ucsf Health Medical Foundation (NPI 1922124866, Oakland, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Wayne State University School Of Medicine, class of 2021
## Record status
- **NPPES last updated:** August 6, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1003493701) · Data from the CMS NPPES public registry.