Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Guillermo Gonzalez, MD

Individual provider Hematology & Oncology Physician · NPI 1740249986

Guillermo Gonzalez, MD practises Medical Oncology in Tucson, Arizona. Qualified in 1976, 50 years ago. Practices with Arizona Blood and Cancer Specialists, PLLC, a 15-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
50
Licensed in
AZ
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3945 E Paradise Falls Dr Ste 105
Tucson, AZ 85712-6686
Phone: (520) 689-7030
Fax: (520) 395-9796
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 1710 N Mastick Way, Nogales, AZ 85621-1013 — (520) 689-7030
  • 507 N Western Ave, Nogales, AZ 85621-2060 — (520) 689-7030
  • 1620 W Saint Marys Rd, Tucson, AZ 85745-2624 — (520) 624-7445

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 20067 (AZ)

Record details

NPI number1740249986
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 17, 2006
Last updated in NPPESAugust 26, 2020
Certification dateAugust 26, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 1976 (50 years in practice)
Group practice Arizona Blood And Cancer Specialists, Pllc — 15 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients289
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $222 11 payments · a meal or drink at a meeting or visit, not a fee
Education $78 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Arizona Blood and Cancer Specialists, PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 15 clinicians in the practice; 12 are shown here.

Other providers in Tucson