DR. GUUS MARTINUS BOL MD, PHD
NPI 1932914926
Internal Medicine - Medical Oncology in San Francisco, CA
About Dr. Guus Martinus Bol Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GUUS MARTINUS BOL MD, PHD (NPI 1932914926) is an individual medical oncology provider in San Francisco, California, licensed in California (PSY30374) and active in the NPI registry since February 2025. He is enrolled in Medicare PECOS and is a graduate of Other (2011).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Guus Martinus Bol Md, Phd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Guus Bol reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Guus Bol's NPI number?
The NPI number for Guus Bol is 1932914926. It was assigned to this individual provider in the NPPES registry on February 8, 2025.
Where is Guus Bol located?
Guus Bol practices at 1975 4th St, San Francisco, CA 94143. The listed phone number is (415) 353-3000.
What is Guus Bol's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is Guus Bol enrolled in Medicare?
Yes. Guus Bol is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Guus Bol's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Guus Bol reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Guus Bol's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Guus Bol was last updated on September 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Guus Martinus Bol, MD, PHD · NPI 1932914926
Medical Oncology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since February 8, 2025.
## Identity
- **NPI:** 1932914926 (Entity type: Individual)
- **Enumerated:** February 8, 2025
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** PSY30374 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1975 4TH ST, San Francisco, CA 94143-2351
- **Phone:** (415) 353-3000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1235322348, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** September 29, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1932914926) · Data from the CMS NPPES public registry.