William B. Pearse, MD
Hematology & Oncology Physician · Portland, OR
William B. Pearse, MD is a hematology & oncology physician with a practice address in Portland, Oregon, and NPI 1225423148, issued on Mar 30, 2015. Check the license (Oregon MD227390, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- William B. Pearse
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- MD227390 OR
173950 CA
123456789 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4805 NE Glisan St Ste 11N, Portland, OR 97213
- Phone
- (503) 215-5696
- Enumerated
- Mar 30, 2015
- Record last updated
- Nov 4, 2025
- Medicare enrollment
- Enrolled (PECOS I20211129002386); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 138 in Oregon → Look up another NPI →
Also registered at 4805 NE Glisan St Ste 11N
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rhezarie Mae Agtarap, NP-CGerontology Nurse Practitioner1023576659
- Hugo Akabane, M.D.Hematology (Internal Medicine) Physician1982010583
- Rebecca Armendariz, MDHospice and Palliative Medicine (Internal Medicine) Physician1073773818
- Asher Bar-Nes Caldwell, ANP-BC, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1699915355
- Richard Bell, MD, DDSOral & Maxillofacial Surgery (D.M.D.)1992704878
- Evelyn Brosnan, M.D.Hematology & Oncology Physician1497098941
Verify William B. Pearse in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD227390Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
508 Medicare Part D claims for 61 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
- Hydroxyurea63 claims
- Eliquis52 claims
- Acyclovir39 claims
- Sulfamethoxazole-Trimethoprim29 claims
- Ondansetron Odt26 claims
- Calquence25 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $96.55
1 payment: food and beverage; the largest payer was Blueprint Medicines Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Providence Health And Services OregonPortland, OR
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William B. Pearse among 138 hematology & oncology physician records in Oregon
William B. Pearse, MD is one of 138 hematology & oncology physician records with a practice address in Oregon. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 85% of them.
- NPI issued2015 · 85% of these records are older, 10% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2015 · median 2001 among the 97 with a school on file
- Record last updated2025 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Oregon
There are 138 hematology & oncology physician records in Oregon.
All 138 in Oregon → Every provider in Portland → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Sharif Ahmed, M.D.Portland, OR 972131629465554
- Evelyn Brosnan, M.D.Portland, OR 972131497098941
- Myung Sun KimPortland, OR 972131639457583
- Jeffrey Menashe, M.D.Portland, OR 972131871596551
- William Mooney, M.D.Portland, OR 972131467455014
- David Regan, M.D.Portland, OR 972131255334926
- Mark Seligman, M.D.Portland, OR 972131528061173
- Miklos Simon, MDPortland, OR 972131710919972
Common questions
What is William B. Pearse, MD's NPI number?
William B. Pearse, MD's National Provider Identifier (NPI) is 1225423148, issued on Mar 30, 2015. An NPI identifies a provider in billing; it is not a license.
Where is William B. Pearse, MD located?
The NPPES record lists a practice address at 4805 NE Glisan St Ste 11N, Portland, OR, 97213. Phone: (503) 215-5696. Providers update this record themselves, so call before visiting.
How can I verify William B. Pearse, MD's license?
NPPES lists Oregon license number MD227390, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William B. Pearse, MD prescribe under Medicare Part D?
In 2024, William B. Pearse, MD had 508 Medicare Part D claims for 61 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.