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

William B Pearse, MD

Individual provider Hematology & Oncology Physician · NPI 1225423148

William B Pearse, MD practises Hematology/Oncology in Portland, Oregon. Qualified in 2015, 11 years ago. Practices with Regents of the University of California, a 2,061-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in California, Illinois and Oregon.

Years since qualifying
11
Licensed in
CA, IL, OR
In the registry since
2015
Specialties on file
4
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

4805 NE Glisan St Ste 11N
Portland, OR 97213-2933
Phone: (503) 215-5696
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 200 W Arbor Dr, San Diego, CA 92103-9000 — (800) 926-8273
  • 2160 S 1st Ave, Maywood, IL 60153-3328 — (708) 216-5620

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 173950 (CA)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence MD227390 (OR)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence MD227390 (OR)
Internal Medicine Physician Taxonomy 207R00000X · Licence 123456789 (IL)

Record details

NPI number1225423148
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 30, 2015
Last updated in NPPESNovember 4, 2025
Certification dateNovember 4, 2025

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice Regents Of The University Of California — 2061 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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 patients201
Services billed 509 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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.

Colleagues at Regents of the University of California

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2061 clinicians in the practice; 12 are shown here.

Other providers in Portland