Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Sabrina Maria Witherby, MD

Individual provider Hematology & Oncology Physician · NPI 1881811008

Sabrina Maria Witherby, MD practises Hematology/Oncology in Providence, Rhode Island. Graduated from University of Massachusetts Medical School in 2001, 25 years ago. Practices with Rhode Island Hospital, a 428-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Rhode Island.

Years since qualifying
25
Trained at
University of Massachusetts Medical School
Licensed in
RI
In the registry since
2007
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

593 Eddy Street Apc Main
Providence, RI 02903-4923
Phone: (401) 444-5435
Fax: (401) 444-8301
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence MD12400 (RI)

Record details

NPI number1881811008
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 19, 2007
Last updated in NPPESJune 13, 2018

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL
Graduated 2001 (25 years in practice)
Group practice Rhode Island Hospital — 428 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 patients193
Services billed 367 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

  • The Miriam Hospital Hospital · Providence, RI
  • Rhode Island Hospital Hospital · Providence, RI

Colleagues at Rhode Island Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 428 clinicians in the practice; 12 are shown here.

Other providers in Providence