William J. Tester, MD
Hematology & Oncology Physician · Philadelphia, PA
William J. Tester, MD is a hematology & oncology physician with a practice address in Philadelphia, Pennsylvania, and NPI 1386613693, issued on Mar 17, 2006. Check the license (Pennsylvania MD021791E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- William J. Tester
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- MD021791E PA
Self-reported in NPPES; status is on the state search - Practice location
- 925 Chestnut St Ste 320A, Philadelphia, PA 19107
- Phone
- (215) 955-8874
- Enumerated
- Mar 17, 2006
- Record last updated
- Nov 9, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (215) 955-2340
- Medicaid ID
- 0009201560004 PA
- Medicare enrollment
- Enrolled (PECOS I20110510000624); accepts Medicare assignment
- Medical or professional school
- Hahnemann University College Of Medicine, 1972
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 784 in Pennsylvania → Look up another NPI →
Also registered at 925 Chestnut St Ste 320A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adam Binder, MDHematology & Oncology Physician1528389178
- Nathan Handley, M.D.Internal Medicine Physician1356617732
- Daniel Lin, M.D.Medical Oncology Physician1831477710
- Ana Maria Lopez, MDMedical Oncology Physician1427156017
- Madeleine Naccarato, CRNPNurse Practitioner1821678418
- Regine Nshimiyimana ManirahoFamily Nurse Practitioner1033511191
Verify William J. Tester in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD021791ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
564 Medicare Part D claims for 66 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 34 claims were for opioids.
Most prescribed
- Prednisone113 claims
- Abiraterone Acetate101 claims
- Orgovyx46 claims
- Tagrisso31 claims
- Gabapentin23 claims
- Acetaminophen-Codeine22 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: $29.36
1 payment: food and beverage; the largest payer was Regeneron Healthcare Solutions, Inc. 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 one group practice
- Jefferson University PhysiciansPhiladelphia, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William J. Tester among 784 hematology & oncology physician records in Pennsylvania
William J. Tester, MD is one of 784 hematology & oncology physician records with a practice address in Pennsylvania. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1972 · median 2004 among the 553 with a school on file
- Record last updated2018 · 60% 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 Pennsylvania 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 Pennsylvania
There are 784 hematology & oncology physician records in Pennsylvania.
All 784 in Pennsylvania → Every provider in Philadelphia → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Anjali Avadhani, MDPhiladelphia, PA 191071194887059
- Andrew Chapman, DOPhiladelphia, PA 191071306913033
- Rodwige Desnoyers, M.D.Philadelphia, PA 191071326159021
- Frederick Fellin, MDPhiladelphia, PA 191071679684476
- Thomas Klumpp, MDPhiladelphia, PA 191071194713271
- Bijoyesh Mookerjee, M.D.Philadelphia, PA 191071407836083
- Pierluigi Porcu, M.D.Philadelphia, PA 191071376551564
- Lewis Rose, MDPhiladelphia, PA 191071407923113
Common questions
What is William J. Tester, MD's NPI number?
William J. Tester, MD's National Provider Identifier (NPI) is 1386613693, issued on Mar 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William J. Tester, MD located?
The NPPES record lists a practice address at 925 Chestnut St Ste 320A, Philadelphia, PA, 19107. Phone: (215) 955-8874. Providers update this record themselves, so call before visiting.
How can I verify William J. Tester, MD's license?
NPPES lists Pennsylvania license number MD021791E, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William J. Tester, MD prescribe under Medicare Part D?
In 2024, William J. Tester, MD had 564 Medicare Part D claims for 66 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.