Margaret Guo, MD, PHD
Medical Oncology Physician · San Francisco, CA
Margaret Guo, MD, PHD is a medical oncology physician with a practice address in San Francisco, California, and NPI 1174225379, issued on Mar 20, 2023. Check the license (California 200118, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret Guo
- Credential
- MD, PHD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 200118 CA
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave # M1480, San Francisco, CA 94143
- Phone
- (415) 476-1000
- Enumerated
- Mar 20, 2023
- Record last updated
- Jul 17, 2026
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 505 Parnassus Ave # M1480
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Johanna BalasStudent in an Organized Health Care Education/Training Program1043893548
Verify Margaret Guo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 200118Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average medical oncology physician in 2024
29 Medicare Part D claims for 13 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D.
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.
Margaret Guo among 447 medical oncology physician records in California
Margaret Guo, MD, PHD is one of 447 medical oncology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 99% of them.
- NPI issued2023 · 99% of these records are older, under 1% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2026 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in California
There are 447 medical oncology physician records in California.
All 447 in California → Every provider in San Francisco → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Donald Abrams, MDSan Francisco, CA 941431679530018
- Weiyun Ai, MDSan Francisco, CA 941431649346842
- Rohit Bose, M.D., PH.D.San Francisco, CA 941431710140850
- Edward Cha, M.D.San Francisco, CA 941431134330988
- Lloyd Damon, MDSan Francisco, CA 941431548224058
- Steven Deeks, MDSan Francisco, CA 941431073604666
- Kristen Hege, MDSan Francisco, CA 941431710925987
- Gerald Hsu, MDSan Francisco, CA 941431467501080
Common questions
What is Margaret Guo, MD, PHD's NPI number?
Margaret Guo, MD, PHD's National Provider Identifier (NPI) is 1174225379, issued on Mar 20, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Guo, MD, PHD located?
The NPPES record lists a practice address at 505 Parnassus Ave # M1480, San Francisco, CA, 94143. Phone: (415) 476-1000. Providers update this record themselves, so call before visiting.
How can I verify Margaret Guo, MD, PHD's license?
NPPES lists California license number 200118, 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 Margaret Guo, MD, PHD prescribe under Medicare Part D?
In 2024, Margaret Guo, MD, PHD had 29 Medicare Part D claims for 13 beneficiaries; the average among medical oncology physician prescribers was 703. 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.