Rebecca Sara Karp, M.D.
Hematology & Oncology Physician · Boston, MA
Rebecca Sara Karp, M.D. is a hematology & oncology physician with a practice address in Boston, Massachusetts, and NPI 1265669659, issued on Jun 12, 2009. Check the license (Massachusetts 251249, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Rebecca Sara Karp
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 251249 MA
Self-reported in NPPES; status is on the state search - Practice location
- 330 Brookline Ave, Boston, MA 02215
- Phone
- (617) 667-2100
- Enumerated
- Jun 12, 2009
- Record last updated
- Feb 11, 2026
- Fax
- (617) 975-5665
- Medicare enrollment
- Enrolled (PECOS I20120822000250); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2009
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 461 in Massachusetts → Look up another NPI →
Also registered at 330 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Najma Abdullahi, MD, MPHStudent in an Organized Health Care Education/Training Program1669213054
- Elisabeth AbelesStudent in an Organized Health Care Education/Training Program1528659760
Verify Rebecca Sara Karp in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 251249Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
242 Medicare Part D claims for 60 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 64% of claims.
Most prescribed
- Eliquis80 claims
- Hydroxyurea30 claims
- Xarelto24 claims
- Tranexamic Acid16 claims
- Warfarin Sodium15 claims
- Enoxaparin Sodium12 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: $6,945.00
2 payments; by number, the most common kind was compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program; the largest payer was Recordati_rare_diseases_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 2 group practices
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationWaltham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rebecca Sara Karp among 461 hematology & oncology physician records in Massachusetts
Rebecca Sara Karp, M.D. is one of 461 hematology & oncology physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2009 · median 2004 among the 303 with a school on file
- Record last updated2026 · 62% 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 Massachusetts 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 Massachusetts
There are 461 hematology & oncology physician records in Massachusetts.
All 461 in Massachusetts → Every provider in Boston → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Gregory Abel, MDBoston, MA 022151285611954
- Nancy Andrea, M.D.Boston, MA 022151033193719
- David Avigan, M.D.Boston, MA 022151952349243
- David Barbie, MDBoston, MA 022151164401626
- Christopher Lee Carpenter, M.D.Boston, MA 022151083651798
- Bimalangshu Dey, MDBoston, MA 022151679563845
- Robb Friedman, M.D.Boston, MA 022151669451514
- Leena Gandhi, MD PHDBoston, MA 022151841275906
Common questions
What is Rebecca Sara Karp, M.D.'s NPI number?
Rebecca Sara Karp, M.D.'s National Provider Identifier (NPI) is 1265669659, issued on Jun 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Rebecca Sara Karp, M.D. located?
The NPPES record lists a practice address at 330 Brookline Ave, Boston, MA, 02215. Phone: (617) 667-2100. Providers update this record themselves, so call before visiting.
How can I verify Rebecca Sara Karp, M.D.'s license?
NPPES lists Massachusetts license number 251249, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rebecca Sara Karp, M.D. prescribe under Medicare Part D?
In 2024, Rebecca Sara Karp, M.D. had 242 Medicare Part D claims for 60 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.