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

William T Derosa, DO

Individual provider Hematology (Internal Medicine) Physician · NPI 1902894991

William T Derosa, DO practises Medical Oncology in Morristown, New Jersey. Graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1980, 46 years ago. Practices with Barnabas Health Medical Group PC, a 1,025-clinician group and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
46
Trained at
At Still University of Health Sciences, College of Osteo Med, Kirksville
Licensed in
NJ
In the registry since
2005
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

95 Madison Ave
Morristown, NJ 07960-6092
Phone: (973) 538-5210
Fax: (973) 644-9657
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 25MB03927200 (NJ)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 25MB03927200 (NJ)
Internal Medicine Physician Taxonomy 207R00000X · Licence 25MB03927200 (NJ)

Record details

NPI number1902894991
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedOctober 12, 2005
Last updated in NPPESApril 8, 2026
Certification dateApril 8, 2026

Medicare enrollment

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

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY
Medical schoolAT STILL UNIVERSITY OF HEALTH SCIENCES, COLLEGE OF OSTEO MED, KIRKSVILLE
Graduated 1980 (46 years in practice)
Group practice Barnabas Health Medical Group Pc — 1025 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients309
Services billed 7,188 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

  • Cooperman Barnabas Medical Center Hospital · Livingston, NJ · listed as Cooperman Barnabas Medical Center Inc
  • Morristown Medical Center Hospital · Morristown, NJ

Colleagues at Barnabas Health Medical Group PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1025 clinicians in the practice; 12 are shown here.