Andrea Harzstark, MD
Hematology & Oncology Physician · San Francisco, CA
Andrea Harzstark, MD is a hematology & oncology physician with a practice address in San Francisco, California, and NPI 1871766576, issued on Apr 2, 2008. Check the license (California A86175, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrea Harzstark
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A86175 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 Divisadero St, San Francisco, CA 94143
- Phone
- (415) 353-7171
- Enumerated
- Apr 2, 2008
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20260603002780); may accept Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 1600 Divisadero St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David AlfonRegistered Nurse1558106336
- Christian Apfel, MD, PHDAnesthesiology Physician1578651105
- Fady BekheetPharmacist1780223131
- Fletcher Bell, MDInternal Medicine Physician1811647514
- Lauren Boreta, M.D.Radiation Oncology Physician1679990071
- Ronald Braun, M.D.Anesthesiology Physician1700865367
Verify Andrea Harzstark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A86175Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% more Medicare Part D claims than the average hematology & oncology physician in 2024
978 Medicare Part D claims for 137 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 40 claims were for opioids.
Most prescribed
- Abiraterone Acetate219 claims
- Prednisone178 claims
- Nubeqa84 claims
- Alendronate Sodium43 claims
- Xtandi38 claims
- Dexamethasone31 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Andrea Harzstark among 1,583 hematology & oncology physician records in California
Andrea Harzstark, MD is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 60% of them.
- NPI issued2008 · 60% of these records are older, 34% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2002 · median 2003 among the 1,124 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in San Francisco → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Alain Algazi, M.D.San Francisco, CA 941431821289794
- Shagun Arora, MDSan Francisco, CA 941431316198112
- Collin Blakely, MDSan Francisco, CA 941431528287174
- Terence Friedlander, MSSan Francisco, CA 941431215134267
- Wesley Kidder, MDSan Francisco, CA 941431669761151
- James Lee, M.D.San Francisco, CA 941431346482007
- Inga Lennes, M.D.San Francisco, CA 941431427134568
- Raymond Liu, M.D.San Francisco, CA 941431376645861
Common questions
What is Andrea Harzstark, MD's NPI number?
Andrea Harzstark, MD's National Provider Identifier (NPI) is 1871766576, issued on Apr 2, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Andrea Harzstark, MD located?
The NPPES record lists a practice address at 1600 Divisadero St, San Francisco, CA, 94143. Phone: (415) 353-7171. Providers update this record themselves, so call before visiting.
How can I verify Andrea Harzstark, MD's license?
NPPES lists California license number A86175, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrea Harzstark, MD prescribe under Medicare Part D?
In 2024, Andrea Harzstark, MD had 978 Medicare Part D claims for 137 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.