Sara Won, MD
Sara Won, MD is an Obstetrics & Gynecology Physician in Walnut Creek, CA, registered under NPI 1003134180. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Walnut Creek, based on OpenStreetMap data collected Sep 1, 2026. Parking is available about 605 ft away. There is EV charging 0.36 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 630 ft away, served by South Main Street & Kaiser Medical Center. A pharmacy sits 0.41 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.39 mi away.
Getting here and what is nearby
Parking 283 ft ~2 min
Transit Newell Avenue & Kaiser Medical Center 308 ft ~2 min
Gas station Flyers Energy 328 ft ~2 min
Restaurant Andaman Thai Walnut Creek 413 ft ~2 min
1560 Newell Avenue
Restaurant 360 Gourmet Burritos 448 ft ~2 min
1558 Newell Avenue
Gas station Mobil 479 ft ~2 min
Restaurant Subway 470 ft ~2 min
1556 Newell Avenue, Walnut Creek 94596
Mo-Sa 09:00-22:00; Su 10:00-21:00
Grocery Trader Joe's 512 ft ~2 min
1372 South California Boulevard, Walnut Creek 94596
Mo-Su 08:00-21:00
Transit South California Boulevard & Newell Avenue 566 ft ~3 min
Gas station Kwik Serv 602 ft ~3 min
Parking 567 ft ~3 min
Parking 605 ft ~3 min
Transit South Main Street & Kaiser Medical Center 630 ft ~3 min
Grocery Whole Foods Market 0.25 mi ~6 min
1333 Newell Avenue, Walnut Creek 94596
Mo-Su 08:00-21:00
EV charging Walnut Creek Supercharger 0.26 mi ~6 min
Coffee Starbucks 0.29 mi ~6 min
EV charging 0.36 mi ~8 min
Coffee Starbucks 0.37 mi ~8 min
Coffee Chagee 0.39 mi ~8 min
1500 Mount Diablo Boulevard, Walnut Creek 94596
Pharmacy CVS Pharmacy 0.41 mi ~9 min
Grocery Safeway 0.46 mi ~10 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 |
|---|---|---|
| A143465 | CA | Obstetrics & Gynecology Physician primary |
This provider holds licence A143465 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
- 3971820572
- Enrollment ID
- I20161209001622
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 | |
|---|---|---|---|---|
| 390200000X | Student in an Organized Health Care Education/Training Program | — | — | |
| 207V00000X | Obstetrics & Gynecology Physician | A143465 | CA | primary |
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 | 1003134180 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 13, 2010 |
| Last updated | Apr 20, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | MD |
| Practice address |
1425 S MAIN ST Walnut Creek, CA 94596 (925) 295-4040 |
| Mailing address |
330 BROOKLINE AVE Boston, MA 02215 |
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 | 1 | 3 | 4 | 1 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 3 | 8 | 1 | 7 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.