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

William J Tester, MD

Individual provider Medical Oncology Physician · NPI 1386613693

William J Tester, MD practises Hematology/Oncology in Philadelphia, Pennsylvania. Graduated from Hahnemann University College of Medicine in 1972, 54 years ago. Practices with Jefferson University Physicians, a 1,554-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Pennsylvania.

Years since qualifying
54
Trained at
Hahnemann University College of Medicine
Licensed in
PA
In the registry since
2006
Specialties on file
2
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

925 Chestnut St Ste 320A
Philadelphia, PA 19107
Phone: (215) 955-8874
Fax: (215) 955-2340
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 5501 Old York Rd, Philadelphia, PA 19141 — (215) 456-3880

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence MD021791E (PA)
Medical Oncology Physician Taxonomy 207RX0202X · Licence MD021791E (PA)

Record details

NPI number1386613693
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 17, 2006
Last updated in NPPESNovember 9, 2018

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolHAHNEMANN UNIVERSITY COLLEGE OF MEDICINE
Graduated 1972 (54 years in practice)
Group practice Jefferson University Physicians — 1554 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients128
Services billed 395 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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. Those with a page here are linked.

Colleagues at Jefferson University Physicians

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1554 clinicians in the practice; 12 are shown here.

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