WILLIAM B PEARSE MD
NPI 1225423148
Internal Medicine - Hematology & Oncology in Portland, OR

Q: What is William Pearse's NPI number?

The NPI number for William Pearse is 1225423148. It was assigned to this individual provider in the NPPES registry on March 30, 2015.

Q: What is William Pearse's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for William Pearse was last updated on November 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 30, 2015PECOS EnrolledAccepts Medicare Assignment

4805 NE GLISAN ST STE 11N, PORTLAND, OR 97213(503) 215-5696 Get Directions Write a Review

NPPES record last updated: November 4, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Nov 4, 2025, Oct 4, 2021 (2 updates tracked since 2021).

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About William B Pearse Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM B PEARSE MD (NPI 1225423148) is an individual hematology & oncology provider in Portland, Oregon, licensed in California (173950) and active in the NPI registry since March 2015. He is enrolled in Medicare PECOS, is affiliated with Providence Portland Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1225423148

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameWILLIAM B PEARSECredential: MD

Location Address4805 NE GLISAN ST STE 11NPortland, OR 97213-2933

Mailing Address4805 Ne Glisan St Ste 11nPortland, OR 97213-2933

Phone(503) 215-5696

Sole ProprietorNo

Medical School CMSOtherGraduated 2015

Enumeration DateMarch 30, 2015

Last NPPES UpdateNovember 4, 20252 updates tracked since enumeration

NPPES CertifiedNovember 4, 2025

✔ NPI 1225423148 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

Licenses✔ Licensed in CA · 173950✔ Licensed in OR · MD227390

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

Also ListedInternal MedicineTaxonomy 207R00000X · License 123456789 (IL)

Also ListedInternal Medicine · HematologyTaxonomy 207RH0000X · License MD227390 (OR)

4805 NE GLISAN ST STE 11N, Portland, OR 97213

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Secondary Practice Locations 2

Location 1200 W Arbor DrSan Diego, CA 92103-9000 · Phone (800) 926-8273

Location 22160 S 1st AveMaywood, IL 60153-3328 · Phone (708) 216-5620

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William B Pearse Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1254632029

PECOS Enrollment IDI20211129002386, I20250930003377

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

184 services64 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

69 services52 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

58 services24 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

31 services31 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

30 services30 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

29 services20 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Providence Portland Medical Center

Acute Care Hospitals · Portland, OR

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number380061

Location4805 NE Glisan StreetPortland, OR 97213 · Multnomah County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97213 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$176.88 typical visit price

range $58.99 – $176.88

Typical copayment $44.22 (range $14.74 – $44.22)

Most-billed visit code 99205

Established Patient

$103.51 typical visit price

range $19.32 – $144.79

Typical copayment $25.87 (range $4.83 – $36.19)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PROVIDENCE HEALTH & SERVICES - OREGON

Obstetrics & Gynecology