Yun-han Huang
Yun-han Huang is a Rheumatology Physician in San Francisco, CA, registered under NPI 1003442096. 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 San Francisco, based on OpenStreetMap data collected Aug 31, 2026. Parking is available about 936 ft away. The nearest transit stop is 263 ft away, served by Irving Street & Arguello Boulevard. A pharmacy sits 0.28 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.27 mi away.
Getting here and what is nearby
Parking 94 ft ~1 min
Transit Parnassus Avenue & Hillway Avenue 166 ft ~1 min
Transit Parnassus Avenue & Hillway Avenue 220 ft ~1 min
Transit Irving Street & Arguello Boulevard 263 ft ~1 min
Coffee Starbucks 295 ft ~2 min
350 Parnassus Avenue, San Francisco 94117
Mo-We 05:30-17:30; Th-Fr 05:00-18:00; Sa 06:00-17:00; Su 07:00-15:00
Parking Main Parking Garage 333 ft ~2 min
Restaurant Panda Express 395 ft ~2 min
500 Parnassus Avenue, San Francisco 94143
Mo-Fr 09:30-20:00, Sa-Su 10:30-17:00
Restaurant Subway 418 ft ~2 min
Mo-Fr 07:30-21:00; Sa-Su 08:00-20:00
Restaurant Pizzetta Napoletana 578 ft ~3 min
775 Frederick Street, San Francisco 94117
Convenience UC Market 869 ft ~4 min
1251 3rd Avenue, San Francisco 94122
Mo-Fr 09:00-23:00; Sa-Su 09:00-24:00
Coffee Yo También Cantina 896 ft ~4 min
205 Hugo Street, San Francisco 94122
Mo-Tu off; We-Su 10:00-15:00
Parking 936 ft ~4 min
Convenience Sunny Country Foods 0.26 mi ~6 min
1101 Stanyan Street, San Francisco 94117
Coffee California Kahve 0.27 mi ~6 min
300 Bowling Green Drive, San Francisco 94122
Mo off; Tu-Su 10:00-17:00
Convenience Parkview Market 0.28 mi ~6 min
501 Frederick Street, San Francisco 94117
Mo-Sa 09:00-22:00; Su 09:00-21:00
Pharmacy Walgreens 0.28 mi ~6 min
199 Parnassus Avenue, San Francisco 94117
Gas station Shell 0.40 mi ~9 min
601 Lincoln Way
Grocery Luke's Local 0.43 mi ~9 min
Grocery Whole Foods Market 0.45 mi ~9 min
690 Stanyan Street, San Francisco 94117
Mo-Su 08:00-22:00
Grocery Luke's Local 0.49 mi ~10 min
1266 9th Avenue
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 |
|---|---|---|
| A178471 | CA | Rheumatology Physician primary |
| 285070 | MA | Internal Medicine Physician |
Licences are recorded in 2 states: CA, MA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Rheumatology
- PAC ID
- 3779996749
- Enrollment ID
- I20240719001210
Medicare enrolment is recorded as approved under the provider type Practitioner - Rheumatology. 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.
Licensed in 2 states
This provider holds licences in 2 states: California and Massachusetts. The practice address on file is in San Francisco, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- A178471
- Specialty
- Rheumatology Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Rheumatology covers
An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and "collagen" diseases. NUCC Health Care Provider Taxonomy, code 207RR0500X
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 | |
|---|---|---|---|---|
| 207RR0500X | Rheumatology Physician Rheumatology | A178471 | CA | primary |
| 207R00000X | Internal Medicine Physician | 285070 | MA |
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 | 1003442096 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 21, 2020 |
| Last updated | Jul 12, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
400 PARNASSUS AVE FL B1 San Francisco, CA 94143 (415) 353-2497 |
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 | 4 | 2 | 0 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 4 | 4 | 0 | 9 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
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.