Guus Martinus Bol, MD, PHD
Medical Oncology Physician · San Francisco, CA
Guus Martinus Bol, MD, PHD is a medical oncology physician with a practice address in San Francisco, California, and NPI 1932914926, issued on Feb 8, 2025. Check the license (California PSY30374, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Guus Martinus Bol
- Credential
- MD, PHD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- PSY30374 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1975 4TH St, San Francisco, CA 94143
- Phone
- (415) 353-3000
- Enumerated
- Feb 8, 2025
- Record last updated
- Sep 29, 2025
- Medicare enrollment
- Enrolled (PECOS I20250506003519); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 1975 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Guus Martinus Bol in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license PSY30374Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 3 group practices
- Regents OF The University OF CaliforniaSan Francisco, CA
- Ucsf Medical Group Business ServicesBurlingame, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Guus Martinus Bol among 447 medical oncology physician records in California
Guus Martinus Bol, 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 2025, is newer than over 99% of them.
- NPI issued2025 · over 99% of these records are older, under 1% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2011 · median 2004 among the 312 with a school on file
- Record last updated2025 · 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 Guus Martinus Bol, MD, PHD's NPI number?
Guus Martinus Bol, MD, PHD's National Provider Identifier (NPI) is 1932914926, issued on Feb 8, 2025. An NPI identifies a provider in billing; it is not a license.
Where is Guus Martinus Bol, MD, PHD located?
The NPPES record lists a practice address at 1975 4TH St, San Francisco, CA, 94143. Phone: (415) 353-3000. Providers update this record themselves, so call before visiting.
How can I verify Guus Martinus Bol, MD, PHD's license?
NPPES lists California license number PSY30374, 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.
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.