David Huang, M.D.
David Huang, M.D. is a Reproductive Endocrinology Physician in San Francisco, CA, registered under NPI 1205367729. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 499 ILLINOIS ST FL 6, San Francisco, CA 94158. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A159078 | CA | Reproductive Endocrinology Physician primary |
| A159078 | CA | Obstetrics & Gynecology Physician |
This provider holds licence A159078 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
- 3870905318
- Enrollment ID
- I20210727001218
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 Reproductive Endocrinology covers
An obstetrician/gynecologist who is capable of managing complex problems relating to reproductive endocrinology and infertility. NUCC Health Care Provider Taxonomy, code 207VE0102X
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 | |
|---|---|---|---|---|
| 207VE0102X | Reproductive Endocrinology Physician Reproductive Endocrinology | A159078 | CA | primary |
| 207V00000X | Obstetrics & Gynecology Physician | A159078 | CA |
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 | 1205367729 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 26, 2017 |
| Last updated | Jan 13, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
499 ILLINOIS ST FL 6 San Francisco, CA 94158 (415) 353-7475 Fax (415) 353-7744 |
| Mailing address |
550 16TH ST FL 7 BOX 0132 San Francisco, CA 94158 |
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 | 2 | 0 | 5 | 3 | 6 | 7 | 7 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 0 | 5 | 6 | 6 | 5 | 7 | 4 |
Sum = 61 · next multiple of 10 = 70 · check digit = 9 · actual last digit = 9
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.