Donald Feinstein, M.D.
Donald Feinstein, M.D. is a Hematology (Internal Medicine) Physician in Los Angeles, CA, registered under NPI 1861429581.
Getting there
The practice address on file is 1520 SAN PABLO ST SUITE 1000, Los Angeles, CA 90033. 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 |
|---|---|---|
| G05611 | CA | Hematology (Internal Medicine) Physician primary |
This provider holds licence G05611 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
An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, clotting disorders, sickle cell disease, hemophilia, leukemia and lymphoma. NUCC Health Care Provider Taxonomy, code 207RH0000X
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 | 1861429581 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 27, 2006 |
| Last updated | Jun 25, 2008 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
1520 SAN PABLO ST SUITE 1000 Los Angeles, CA 90033 (626) 457-5839 Fax (626) 457-4079 |
| Mailing address |
PO BOX 31218 Los Angeles, CA 90031 |
| Other identifiers |
000G56110
· Medicaid (CA) GR0016910 · Other (CA) 00G56110197 · Other (CA) W11675 · Other (CA) ZZZ50018Z · Other (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 | 8 | 6 | 1 | 4 | 2 | 9 | 5 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 3 | 1 | 8 | 2 | 9 | 5 | 7 |
Sum = 69 · next multiple of 10 = 70 · check digit = 1 · actual last digit = 1
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.