Alexandra Flessel, MD
Alexandra Flessel, MD is an Obstetrics & Gynecology Physician in San Mateo, CA, registered under NPI 1003493701. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in San Mateo, based on OpenStreetMap data collected Sep 30, 2026. Parking is available about 0.37 mi away at Urgent Care Parking Lot. There is EV charging 0.31 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 0.27 mi away, served by North Delaware Street & Monte Diablo Avenue. A pharmacy sits 0.43 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.33 mi away.
Getting here and what is nearby
Parking 162 ft ~1 min
Parking 275 ft ~2 min
Transit El Camino Real & Tilton Avenue 855 ft ~4 min
Transit El Camino Real & El Cerrito Avenue 941 ft ~4 min
Grocery Mi Rancho Supermarket 0.20 mi ~4 min
Coffee Bobabia 0.24 mi ~5 min
271 Baldwin Avenue, San Mateo
Restaurant La Cumbre 0.25 mi ~6 min
28 North B Street, San Mateo
Transit North Delaware Street & Monte Diablo Avenue 0.27 mi ~6 min
Restaurant Ox 9 Lanzhou Hand Pulled Noodles 0.27 mi ~6 min
11 South B Street, San Mateo 94401
11:00-15:00, 17:00-21:00
Restaurant No. 5 House 0.27 mi ~6 min
5 South Ellsworth Avenue, San Mateo
EV charging EVgo 0.31 mi ~7 min
EV charging EVgo 0.31 mi ~7 min
EV charging 0.31 mi ~7 min
Coffee Yifang 0.32 mi ~7 min
110 South B Street
Coffee Philz Coffee 0.33 mi ~7 min
113 South B Street, San Mateo 94401
Su-Th 06:00-20:00; Fr-Sa 06:00-20:30
Parking Urgent Care Parking Lot 0.37 mi ~8 min
100 South San Mateo Drive, San Mateo 94401
Pharmacy Walgreens 0.43 mi ~9 min
193 East 3rd Avenue
Mo-Fr 08:00-21:00; Sa 09:00-18:00; Su 10:00-18:00
Grocery Takahashi Market 0.48 mi ~10 min
Grocery Suruki Super Market 0.49 mi ~10 min
71 East 4th Avenue, 94401
Mo-Sa 10:00-19:00; Su 10:30-18:00
Gas station Shell 0.50 mi ~11 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A203951 | CA | Obstetrics & Gynecology Physician primary |
This provider holds licence A203951 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Obstetrics/gynecology
- PAC ID
- 8628472859
- Enrollment ID
- I20250825002122
Medicare enrolment is recorded as approved under the provider type Practitioner - Obstetrics/gynecology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Obstetrics & Gynecology covers
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women. NUCC Health Care Provider Taxonomy, code 207V00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207V00000X | Obstetrics & Gynecology Physician | A203951 | CA | primary |
| 390200000X | Student in an Organized Health Care Education/Training Program | — | — |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003493701 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 27, 2021 |
| Last updated | Aug 6, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | MD |
| Practice address |
136 N SAN MATEO DR STE 101 San Mateo, CA 94401 (650) 344-1114 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 4 | 9 | 3 | 7 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 9 | 6 | 7 | 0 |
Sum = 59 · next multiple of 10 = 60 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.