Guus Martinus Bol, MD, PHD

Primary specialty

Medical Oncology PhysicianTaxonomy code 207RX0202X

License

PSY30374 Issued in CA

Practice address

1975 4TH St
San Francisco, CA 94143-2351

Phone

(415) 353-3000

NPI assigned

Feb 8, 2025

Last updated

Sep 29, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Hematology/Oncology

Education

Other, 2011

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

UCSF Medical Group Business ServicesGroup PAC ID 3779497870, 1,533 clinicians

University of California San FranciscoGroup PAC ID 4486567229, 1,780 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• UCSF Medical Center Hospital, San Francisco, CA, CCN 050454

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine, Doctor of Philosophy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gbol403100@direct-ucsfmedicalcenter.org

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• UCSF Medical Group Business Services

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1477624104

  Medical Oncology

  Medicare reassignment Care Compare group NPD
• University of California San Francisco

  dba UCSF Pediatrics Group

  • Pediatrics Physician
  • San Francisco, CA
  • NPI 1861578973
  Medicare reassignment Care Compare group NPD
• Regents of the University of California

  dba UCSF Dept of Medicine General Medicine

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1760552343

  Medical Oncology

  Medicare reassignment NPD
• UCSF Medical Group Business Services

  dba UCSF Orthotic and Prosthetic Center - Gateway Medical Building

  • Health Service Clinic/Center
  • San Francisco, CA
  • NPI 1194115246
  NPD
• University of California San Francisco

  dba UCSF Outpatient Pharmacy at Parnassus

  • Community/Retail Pharmacy
  • San Francisco, CA
  • NPI 1659141711
  NPD
• Regents of the University of California

  dba UCSF Department of Medicine Rheumatology

  • Rheumatology Physician
  • San Francisco, CA
  • NPI 1881763597
  NPD (past)
• University of California San Francisco Medical Center

  dba UCSF Medical Center

  • General Acute Care Hospital
  • San Francisco, CA
  • NPI 1144325440
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• University of California, San Francisco

  dba UCSF Medical Center

  • General Acute Care Hospital
  • San Francisco, CA
  • NPI 1689772592
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1738972800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759104000000",
    "number": "1932914926",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6934 MAIDEN LN",
            "city": "SAN JOSE",
            "state": "CA",
            "postal_code": "951203227",
            "telephone_number": "669-324-2972"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1975 4TH ST",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941432351",
            "telephone_number": "415-353-3000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BOL",
        "first_name": "GUUS",
        "middle_name": "MARTINUS",
        "name_prefix": "Dr.",
        "credential": "MD, PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2025-02-08",
        "last_updated": "2025-09-29",
        "certification_date": "2025-09-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "CA",
            "license": "PSY30374",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Robert Arnold Bok, MD, PHD
• John Frederick Bokelman, M.D.
• Caroline Marie Bokman, MFTI
• Michael Paul Bokoch, M.D., PH.D.
• Seth J. Bokser, M.D.
• Angela Boland, M.A.E., PPS
• Holly Noelle Boland, L.AC.
• Madison Boland, ACSW
• Shahla Alyse Bolbolan, M.D.
• Maisha Bolden

• Medical Oncology Physician in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Medical Oncology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 29, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.