NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1750354130 M.D.
Verify on CMS → Karen Quillen, M.D.
Hematology (Internal Medicine) Physician in Boston, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,451 in Hematology (Internal Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
292
Medicare Part D claims · 87 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Generic prescribing
61%
generic claims · 39% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Karen Quillen, M.D. filed 292 Medicare Part D claims in 2023 as a Hematology (Internal Medicine) Physician in Boston, Massachusetts, prescribing 61% generic.
- 292
- Part D claims, 2023
- 61%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Karen Quillen, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
292 49th percentile higher than 49% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Karen Quillen, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Karen Quillen, M.D.?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
292 58% vs specialty avg
Specialty distribution in Massachusetts
How Hematology (Internal Medicine) Physician compares to other specialties among Massachusetts providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Hematology (Internal Medicine) Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Karen Quillen, M.D. appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding M.D. credentials at 133 BROOKLINE AVE, Boston, MA, 02215, with a listed phone of (671) 421-5950. NPI 1750354130 was issued on 02/08/2006.
Medicare Part D records for calendar year 2023 show 292 prescription claims written by this provider, covering 87 Medicare beneficiaries and totaling roughly $1.5 million in drug spend, split 39% brand-name and 61% generic by claim count.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,451 enrolled providers across 50 states and an average of 693 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1750354130 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 02/08/2006 |
Hospital and facility affiliations
Facilities where Karen Quillen, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Harvard Medical Faculty Phys AT Beth Israel Deaconess Med Ctr Inc
Boston, MA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Massachusetts BORIM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Karen Quillen, M.D.. To verify Karen Quillen, M.D.'s current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Karen Quillen, M.D. - brand share 39.0%
Hematology (Internal Medicine) Physician average
39% brand-name claims vs 61% generic, on 292 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
292
Total Claims
$1.5M
Total Drug Cost
87
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 507
- Total Day Supply
- 14,622
- Brand vs Generic
- 39% brand / 61% generic
- Brand Drug Cost
- $1.4M
- Generic Drug Cost
- $77K
Patient Demographics
- Average Patient Age
- 76.4 years
- Avg HCC Risk Score
- 2.27
- Gender Split
- 53% female / 47% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Karen Quillen, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydroxyurea
Hydroxyurea
79 claims
- Acyclovir 29
Acyclovir
29 claims
- Imatinib Mesylate 21
Imatinib Mesylate
21 claims
- Revlimid 19
Revlimid
19 claims
- Jakafi 17
Jakafi
17 claims
- Pomalyst 15
Pomalyst
15 claims
- Tasigna 13
Tasigna
13 claims
- Prednisone 12
Prednisone
12 claims
| Drug | Claims |
|---|---|
| Hydroxyurea | 79 |
| Acyclovir | 29 |
| Imatinib Mesylate | 21 |
| Revlimid Lenalidomide | 19 |
| Jakafi Ruxolitinib Phosphate | 17 |
| Pomalyst Pomalidomide | 15 |
| Tasigna Nilotinib Hcl | 13 |
| Prednisone | 12 |
| Promacta Eltrombopag Olamine | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in MA →
All providers in Massachusetts →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Karen Quillen, M.D. fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,451
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Karen Quillen, M.D.'s 292 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Quillen.
Dr. Burt Alan Adelman
M.D.
Cambridge, MA
Dr. Joseph Antin
MD
Boston, MA
Dr. Hussein Assi
M.D
Boston, MA
Dr. Joseph Aziz
M.D
Boston, MA
Dr. Amira Barkal
MD
Boston, MA
Compare Hematology (Internal Medicine) Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology (Internal Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Karen Quillen, M.D.'s specialty? ▼
Karen Quillen, M.D. specializes in Hematology (Internal Medicine) Physician and practices in Boston, Massachusetts. Credentials: M.D..
How much does Karen Quillen, M.D. prescribe under Medicare Part D? ▼
In 2023, Karen Quillen, M.D. wrote 292 Medicare Part D claims totaling $1.5M in drug costs for 87 beneficiaries.
Where is Karen Quillen, M.D. located? ▼
Karen Quillen, M.D. is located at 133 BROOKLINE AVE, Boston, MA, 02215. Phone: (671) 421-5950.
What is Karen Quillen, M.D.'s NPI number? ▼
Karen Quillen, M.D.'s National Provider Identifier (NPI) is 1750354130, issued on 02/08/2006.
Does Karen Quillen, M.D. prescribe more brand-name or generic drugs? ▼
Karen Quillen, M.D.'s prescribing is 39% brand-name and 61% generic drugs by claim count, with $1.4M in brand drug costs.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,451 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Karen Quillen, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Karen Quillen, M.D.'s most frequently prescribed drugs include Hydroxyurea, Acyclovir, Imatinib Mesylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Quillen, M.D. accept Medicare? ▼
Karen Quillen, M.D. appears in CMS Medicare data with 292 Part D claims and 87 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Quillen, M.D.'s credentials? ▼
Karen Quillen, M.D.'s NPI is 1750354130 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.