Joan Etzell, M.D.
Joan Etzell, M.D. is a Hematology (Pathology) Physician in San Francisco, CA, registered under NPI 1265470637. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 505 PARNASSUS AVE, 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 |
|---|---|---|
| G79064 | CA | Hematology (Pathology) Physician primary |
| G79064 | CA | Anatomic Pathology & Clinical Pathology… |
| G79064 | CA | Clinical Pathology/Laboratory Medicine… |
This provider holds licence G79064 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Hematology covers
A hematopathologist is expert in diseases that affect blood cells, blood clotting mechanisms, bone marrow and lymph nodes. This physician has the knowledge and technical skills essential for the laboratory diagnosis of anemias, leukemias, lymphomas, bleeding disorders and blood clotting disorders. NUCC Health Care Provider Taxonomy, code 207ZH0000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207ZH0000X | Hematology (Pathology) Physician Hematology | G79064 | CA | primary |
| 207ZP0102X | Anatomic Pathology & Clinical Pathology Physician Anatomic Pathology & Clinical Pathology | G79064 | CA | |
| 207ZP0105X | Clinical Pathology/Laboratory Medicine Physician Clinical Pathology/Laboratory Medicine | G79064 | 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 | 1265470637 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 4, 2006 |
| Last updated | Jul 13, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | M.D. |
| Practice address |
505 PARNASSUS AVE San Francisco, CA 94143 (415) 353-1750 Fax (415) 353-1106 |
| Mailing address |
1635 DIVISADERO STREET SUITE 625, BOX 1821 San Francisco, CA 94143 |
| Other identifiers |
00G790640
· Medicaid (CA) |
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 | 6 | 5 | 4 | 7 | 0 | 6 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 3 | 5 | 8 | 7 | 0 | 6 | 6 |
Sum = 63 · next multiple of 10 = 70 · check digit = 7 · actual last digit = 7
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.