William Carpenter, FNP-C
William Carpenter, FNP-C is a Family Nurse Practitioner in San Francisco, CA, registered under NPI 1003633454.
Getting there
Here is what surrounds this office in San Francisco, based on OpenStreetMap data collected Sep 4, 2026. Parking is available about 0.49 mi away at KOFY-TV Parking. The nearest transit stop is 362 ft away, served by San Francisco General Hospital. If you arrive early, there is a coffee shop 0.24 mi away.
Getting here and what is nearby
Transit 23rd Street & Utah Street 242 ft ~1 min
Transit 23rd Street & Utah Street 285 ft ~2 min
Parking 280 ft ~2 min
Transit San Francisco General Hospital 362 ft ~2 min
Coffee Luna's Coffee House 417 ft ~2 min
Parking SFGH Parking Garage 496 ft ~2 min
Restaurant Newkirk's 580 ft ~3 min
1002 Potrero Avenue, San Francisco 94110
Tu-Fr 08:00-15:00; Sa 09:00-14:00
Restaurant Waterfall Cevicheria 597 ft ~3 min
1000 Potrero Avenue, San Francisco 94110
Mo-Su 12:00-20:00
Convenience N & V Liquors & Grocery 846 ft ~4 min
Restaurant Wok & Go 825 ft ~4 min
Coffee Dynamo Donut & Coffee 0.20 mi ~4 min
2760 24th Street, San Francisco 94110
Mo-Sa 07:00-16:00; Su 08:00-16:00
Convenience Tony's Market 0.20 mi ~4 min
Convenience Ricci's Market 0.21 mi ~5 min
2790 24th Street
Coffee Marigold Cafe 0.24 mi ~5 min
Grocery Five Markets 0.24 mi ~5 min
Gas station Allstars 0.45 mi ~9 min
Parking KOFY-TV Parking 0.49 mi ~10 min
2500 Marin Street, San Francisco 94124
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 |
|---|---|---|
| 95022651 | CA | Family Nurse Practitioner primary |
This provider holds licence 95022651 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 - Nurse Practitioner
- PAC ID
- 2365977196
- Enrollment ID
- I20241203000765
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. 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 Family covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LF0000X
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 | 1003633454 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 25, 2024 |
| Last updated | Sep 25, 2024 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | FNP-C |
| Practice address |
1001 POTRERO AVE San Francisco, CA 94110 (628) 206-8000 |
| Mailing address |
723 44TH AVE San Francisco, CA 94121 |
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 | 6 | 3 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 3 | 6 | 4 | 1 |
Sum = 46 · next multiple of 10 = 50 · check digit = 4 · actual last digit = 4
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.