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

Leona Ann Holmberg

Individual provider Hematology & Oncology Physician · NPI 1720163538

Leona Ann Holmberg practises Medical Oncology in Seattle, Washington. Graduated from University of Miami, Lm Miller School of Medicine in 1986, 40 years ago. Practices with The Association of University Physicians, a 3,459-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
40
Trained at
University of Miami, Lm Miller School of Medicine
Licensed in
WA
In the registry since
2006
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Practice location Partly verified

Some contact details are missing from the federal record.

University Of Washington Medical Ctr 1959 NE Pacific St
Seattle, WA 98195-0001 Not confirmed with CMS for 13 years — call before visiting
Phone: (206) 288-1000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence MD00026543 (WA)

Record details

NPI number1720163538
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedOctober 27, 2006
Last updated in NPPESJanuary 25, 2013

Medicare enrollment

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

Medicare specialtyMEDICAL ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MIAMI, LM MILLER SCHOOL OF MEDICINE
Graduated 1986 (40 years in practice)
Group practice The Association Of University Physicians — 3459 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 patients22
Services billed 75 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at The Association of University Physicians

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3459 clinicians in the practice; 12 are shown here.

Other providers in Seattle