Alexander Geng, M.D.
Radiation Oncology Physician · San Francisco, CA
Alexander Geng, M.D. is a radiation oncology physician with a practice address in San Francisco, California, and NPI 1790066090, issued on Aug 31, 2011. Check the license (California A117696, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alexander Geng
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A117696 CA
Self-reported in NPPES; status is on the state search - Practice location
- 900 Hyde St, San Francisco, CA 94109
- Phone
- (415) 353-6420
- Enumerated
- Aug 31, 2011
- Record last updated
- Mar 17, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120104000359); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2010
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 900 Hyde St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Rosh Marguerite Bautista, MSPhysical Rehabilitation Occupational Therapist1699637819
- Stephen Benzian, MDDiagnostic Radiology Physician1619924032
- Richard Blake, D.P.M.Podiatrist1770559924
- Elsa Burger, LCSWClinical Social Worker1407149131
Verify Alexander Geng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A117696Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% fewer Medicare Part D claims than the average radiation oncology physician in 2024
125 Medicare Part D claims for 35 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims. 35 claims were for opioids.
Most prescribed
- Levothyroxine Sodium28 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.
Alexander Geng among 735 radiation oncology physician records in California
Alexander Geng, M.D. is one of 735 radiation 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 2011, is newer than 69% of them.
- NPI issued2011 · 69% of these records are older, 29% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2010 · median 2005 among the 545 with a school on file
- Record last updated2018 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
All 735 in California → Every provider in San Francisco → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Roy Abendroth, MDSan Francisco, CA 941151811988421
- Jason Chan, M.D.San Francisco, CA 941151033536917
- Barry Chauser, MDSan Francisco, CA 941151902897515
- Alexander Gottschalk, M.D.San Francisco, CA 941151790728137
- I-Chow Hsu, M.D.San Francisco, CA 941151144263039
- Sara Huang, MDSan Francisco, CA 941151053393033
- David Kornguth, M.D.San Francisco, CA 941031801820394
- John Lee, MDSan Francisco, CA 941151316938657
Common questions
What is Alexander Geng, M.D.'s NPI number?
Alexander Geng, M.D.'s National Provider Identifier (NPI) is 1790066090, issued on Aug 31, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Geng, M.D. located?
The NPPES record lists a practice address at 900 Hyde St, San Francisco, CA, 94109. Phone: (415) 353-6420. Providers update this record themselves, so call before visiting.
How can I verify Alexander Geng, M.D.'s license?
NPPES lists California license number A117696, 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 Alexander Geng, M.D. prescribe under Medicare Part D?
In 2024, Alexander Geng, M.D. had 125 Medicare Part D claims for 35 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.