Sabrina Maria Witherby, M.D.
Hematology & Oncology Physician · Providence, RI
Sabrina Maria Witherby, M.D. is a hematology & oncology physician with a practice address in Providence, Rhode Island, and NPI 1881811008, issued on Apr 19, 2007. Check the license (Rhode Island MD12400, as entered in NPPES) on the Rhode Island Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Sabrina Maria Witherby
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- MD12400 RI
Self-reported in NPPES; status is on the state search - Practice location
- 593 Eddy Street, Providence, RI 02903
- Phone
- (401) 444-5435
- Enumerated
- Apr 19, 2007
- Record last updated
- Jun 13, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (401) 444-8301
- Medicaid ID
- SW68672 RI
- Medicare enrollment
- Enrolled (PECOS I20071004000659); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 593 Eddy Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sandra Aguiar, M.S., CCC-SLPSpeech-Language Pathologist1568522548
- Sibel Algon, MDPsychiatry Physician1891851648
- Saud Alhusaini, MD, PHDNeurology Physician1699253591
- Jason Aliotta, MDPulmonary Disease Physician1558314757
- Kerri Amaral, N.P.Acute Care Nurse Practitioner1851601611
- Ellen Andrews-Manocchia, CRNACertified Registered Nurse Anesthetist1306967104
Verify Sabrina Maria Witherby in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersRhode Island Board of Medical Licensure and Discipline
Search for license MD12400Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
618 Medicare Part D claims for 160 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Letrozole211 claims
- Anastrozole70 claims
- Dexamethasone53 claims
- Verzenio38 claims
- Ondansetron Hcl33 claims
- Exemestane28 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Rhode Island HospitalProvidence, RI · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Hematology & Oncology Physician providers in Rhode Island
There are 88 hematology & oncology physician records in Rhode Island.
Other hematology & oncology physician records in Rhode Island
- Hussein Abu-Hashish, MDProvidence, RI1154908093
- Khaja Ahmed, MD, CHEProvidence, RI1851308209
- Muhammad Akhtar, M.D.East Providence, RI1548238918
- Ogheneyoma Akpoviroro-Sauers, MDProvidence, RI1275111676
- Sylvia Alarcon Velasco, M.D.Wakefield, RI1083097091
- Khaldoun Almhanna, MD, MPHProvidence, RI1790977650
- Alvaro Alvarez SotoProvidence, RI1558922674
- Peter Barth, M.D.Providence, RI1124382445
- Ariel Birnbaum, M.D.Providence, RI1942212790
- Theodor Borgovan, M.D.Providence, RI1619397676
Common questions
What is Sabrina Maria Witherby, M.D.'s NPI number?
Sabrina Maria Witherby, M.D.'s National Provider Identifier (NPI) is 1881811008, issued on Apr 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Sabrina Maria Witherby, M.D. located?
The NPPES record lists a practice address at 593 Eddy Street, Providence, RI, 02903. Phone: (401) 444-5435. Providers update this record themselves, so call before visiting.
How can I verify Sabrina Maria Witherby, M.D.'s license?
NPPES lists Rhode Island license number MD12400, as entered by the provider. Search the Rhode Island Board of Medical Licensure and Discipline at https://healthri.mylicense.com/Verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Sabrina Maria Witherby, M.D. prescribe under Medicare Part D?
In 2024, Sabrina Maria Witherby, M.D. had 618 Medicare Part D claims for 160 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Sabrina Maria Witherby, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.