William Weiss, MD
William Weiss, MD is a Neurology with Special Qualifications in Child Neurology Physician in San Francisco, CA, registered under NPI 1417022856. 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 NEUROLOGY UNIV OF CA 533 PARNASSUS AVE, ROOM U441K, San Francisco, CA 94143. 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 |
|---|---|---|
| G72677 | CA | Neurology with Special Qualifications in… primary |
| G72677 | CA | Pediatrics Physician |
This provider holds licence G72677 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 - Neurology
- PAC ID
- 7012990435
- Enrollment ID
- I20040608000811
Medicare enrolment is recorded as approved under the provider type Practitioner - Neurology. 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 Neurology with Special Qualifications in Child Neurology covers
A Child Neurologist specializes in neurology with special skills in diagnosis and treatment of neurologic disorders of the neonatal period, infancy, early childhood, and adolescence. NUCC Health Care Provider Taxonomy, code 2084N0402X
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 | |
|---|---|---|---|---|
| 2084N0402X | Neurology with Special Qualifications in Child Neurology Physician Neurology with Special Qualifications in Child Neurology | G72677 | CA | primary |
| 208000000X | Pediatrics Physician | G72677 | 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 | 1417022856 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 21, 2006 |
| Last updated | Apr 29, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
NEUROLOGY UNIV OF CA 533 PARNASSUS AVE, ROOM U441K San Francisco, CA 94143 (415) 476-1000 |
| Mailing address |
1450 THIRD ST NEUROLOGY UNIV OF CA, ROOM HD277 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 | 4 | 1 | 7 | 0 | 2 | 2 | 8 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 2 | 7 | 0 | 2 | 4 | 8 | 1 |
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.