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Dr. Rebecca Sara Karp, MD
NPI1265669659PAC ID5698922953
- Medicare services, 2024
- 402
- Medicare patients, 2024
- 219
- Part D claims, 2024
- 242
- Publications
- 3
- Hospital affiliations
- 6
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Karp's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Rebecca Sara Karp is a hematologist and oncologist in Boston, Massachusetts
Dr. Karp practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Karp's NPI, 1265669659, was assigned on June 12, 2009. Dr. Karp graduated from Icahn School of Medicine at Mount Sinai in 2009. Dr. Karp holds Massachusetts license 251249.
NPI and contact details
- NPI
- 1265669659NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698922953
- NPI enumeration date
- June 12, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Rebecca Sara Karp practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Karp's primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Source: Dmand AI Affiliation Data
Dr. Rebecca Sara Karp is affiliated with 7 sites of care and 3 medical groups
Dr. Karp's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dr. Karp is also affiliated with Brigham and Women's Hospital. The medical group on file is Massachusetts General Hospital. Dmand AI also links Dr. Karp to 4 more hospitals, 2 medical groups and 1 community health center, each named with a free account. Dr. Karp's employer is on file too: a hospital.
Brigham and Women's HospitalMassachusetts General Hospital4 hospitalsNames with a free account2 medical groupsNames with a free account1 community health centerName with a free accountEmployer: hospitalName with a free account
See all 10 affiliations for Dr. KarpSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Rebecca Sara Karp's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Karp practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +6 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Rebecca Sara Karp is one of 429 hematologists and oncologists in Massachusetts
Hematology and oncology is Dr. Karp's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Karp is licensed in Massachusetts.
Specialties and state licenses
- Hematology and oncology, MassachusettsPrimary
Hematologists and oncologists near Dr. Karp
Counts of hematologists and oncologists with a Dmand AI profile, by place and practice. Each opens the list.
429hematologists and oncologists in Massachusetts224hematologists and oncologists in Boston73hematologists and oncologists at Massachusetts General Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Rebecca Sara Karp billed Medicare for 402 services in 2024
CMS data shows 402 Medicare services from Dr. Karp across 7 procedure codes in 2024, for 219 Medicare patients. Medicare paid $37,964 for them.
Medicare services, 2024402
Medicare patients219
Paid by Medicare$37,964
Procedure codes7
Dr. Karp's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3462024: 31010%
- Other services
- 2023: 222024: 92318%
Where Dr. Karp's Medicare services took place, 2024
- In an office18546%
- In a facility21754%
Dr. Karp compared with the Massachusetts median for hematologists and oncologists, 2024
- Dr. Karp
- Massachusetts median
- Medicare services
- 402vs 49519% below
- Medicare patients
- 219vs 2009% above
- Part D claims
- 189vs 15125% above
Medians across 415 hematologists and oncologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Karp's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Karp?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Karp and other hematologists and oncologists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Rebecca Sara Karp treated 219 Medicare patients in 2024, average age 72
CMS counts 219 Medicare patients who saw Dr. Karp in 2024. The largest group is 75 to 84, with 86 patients. 72% of them have high blood pressure, and 68% have high cholesterol. 19% are also on Medicaid. Their average risk score is 1.99, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Karp's median patient age at 71, with 63% women.
Medicare patients, 2024219
Average age72
Average risk score1.99
Also on Medicaid19%
Dr. Karp's Medicare patients by age, 2024
Dr. Karp's Medicare patients by sex, 2024
- Women13059%
- Men8941%
Chronic conditions among Dr. Karp's Medicare patients, 2024
- High blood pressure72%
- High cholesterol68%
- Arthritis52%
- Anxiety37%
- Chronic kidney disease34%
- Mood disorders33%
- Ischemic heart disease32%
- Diabetes30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Karp's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women63%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Rebecca Sara Karp wrote 242 Medicare Part D claims in 2024
In 2024, Dr. Karp wrote 242 Medicare Part D claims for 60 patients. 36% of them were for generic drugs. CMS names the drug for 189 of them, across 7 drugs with 11 or more claims each, at $270,033 in total drug cost. In 2023, CMS named 151 claims across 7 drugs.
Part D claims, 2024242
Drugs named by CMS7
Total drug cost$270,033
Part D patients60
Dr. Karp's Part D claims by kind of drug, 2024
- Generic87 claims36%
- Brand-name155 claims64%
Dr. Karp's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1512024: 18925%
Drugs named by CMS: 7 in 2024, 7 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Rebecca Sara Karp offers telehealth to Medicare patients
Dr. Karp accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Karp as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Rebecca Sara Karp has 3 publications on record
Dmand AI links 3 papers to Dr. Karp, published from 2013 to 2014. Dr. Karp's most frequent co-authors are Daniel Botelho Costa, MD, Neelam Vijay Desai, MD and Erik Eduardo Folch, MD, MS.
Papers3
Years published2013 to 2014
Dr. Karp's most frequent co-authors
- Daniel Botelho Costa, MD1 shared paper
- Neelam Vijay Desai, MD1 shared paper
- Erik Eduardo Folch, MD, MS1 shared paper
Recent publications by Dr. Karp
See who Dr. Karp researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Karp works with, so you can find a warm path to the right hematologists and oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Rebecca Sara Karp received $41,638 in industry payments from 2017 to 2025
CMS Open Payments shows 34 general payments to Dr. Karp from 10 drug and device companies from 2017 to 2025. Consulting fees make up the largest share, 79% of the total. Recordati_rare_diseases_inc. paid the most, $19,238.
General payments to Dr. Karp by program year, 2017 to 2025
General payments to Dr. Karp by kind, 2017 to 2025
$41.6Kin total
- Consulting fees$32,72079%
- Honoraria$3,0007%
- Travel and lodging$2,7927%
- Speaker and faculty fees$2,0705%
- Other$1,0553%
Companies that paid Dr. Karp the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Rebecca Sara Karp graduated from Icahn School of Medicine at Mount Sinai
Dr. Karp graduated from Icahn School of Medicine at Mount Sinai in 2009.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Rebecca Sara Karp's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Rebecca Sara Karp
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Rebecca Sara Karp's NPI number?
Dr. Rebecca Sara Karp's NPI number is 1265669659. It was assigned on June 12, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Rebecca Sara Karp?
Dr. Rebecca Sara Karp is a hematologist and oncologist in Boston, Massachusetts. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Rebecca Sara Karp practice?
Dr. Karp practices at 55 Fruit Street, Boston, MA 02114. Dr. Karp's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Karp to 4 hospitals, 2 medical groups and 1 community health center.
What is Dr. Rebecca Sara Karp's office phone number?
The practice phone on file for Dr. Karp is (617) 726-2000.
What is Dr. Rebecca Sara Karp's medical license number?
Dr. Karp holds Massachusetts license 251249.
Which hospitals is Dr. Rebecca Sara Karp affiliated with?
Dr. Karp practices at Massachusetts General Hospital in Boston, Massachusetts. Dr. Karp is also affiliated with Brigham and Women's Hospital. Dmand AI links Dr. Karp to 4 more hospitals.
What medical group is Dr. Rebecca Sara Karp part of?
Dr. Karp is linked to Massachusetts General Hospital. Dmand AI links Dr. Karp to 2 more medical groups.
Does Dr. Rebecca Sara Karp accept Medicare?
Yes. CMS data shows Dr. Karp billed Medicare for 402 services in 2024, and Dr. Karp accepts Medicare assignment.
Does Dr. Rebecca Sara Karp offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Karp as offering telehealth services.
How many Medicare patients does Dr. Rebecca Sara Karp see?
CMS counts 219 Medicare patients who saw Dr. Karp in 2024, with an average age of 72.
Show 7 more questionsShow fewer questions
What services does Dr. Rebecca Sara Karp bill to Medicare?
In 2024, Dr. Karp's most billed Medicare services were office visit, established patient (99215), office visit, established patient (99214) and medicare service (G2212).
Where did Dr. Rebecca Sara Karp go to medical school?
Dr. Karp graduated from Icahn School of Medicine at Mount Sinai in 2009.
What drugs does Dr. Rebecca Sara Karp prescribe most?
In 2024 Medicare Part D data, Dr. Karp's most prescribed drugs by claims were Eliquis, Hydroxyurea and Xarelto.
Has Dr. Rebecca Sara Karp received payments from drug or device companies?
CMS Open Payments shows $41,638 in general payments to Dr. Karp from 10 companies from 2017 to 2025. The largest total came from Recordati_rare_diseases_inc.
How long has Dr. Rebecca Sara Karp been practicing?
Dr. Karp graduated from medical school in 2009, 17 years ago.
Does Dr. Rebecca Sara Karp do research?
Dmand AI links 3 publications to Dr. Karp, published from 2013 to 2014.
Who does Dr. Rebecca Sara Karp publish with?
Dr. Karp's most frequent co-authors are Daniel Botelho Costa, MD (1 shared paper), Neelam Vijay Desai, MD (1 shared paper) and Erik Eduardo Folch, MD, MS (1 shared paper).
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