NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1356309280 M.D.
Verify on CMS → Aaron Rapoport, M.D.
Hematology (Internal Medicine) Physician in Baltimore, Maryland.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,436 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
619
Medicare Part D claims · 79 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Industry payments
$53.96
2 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Aaron Rapoport, M.D. filed 619 Medicare Part D claims in 2023 as a Hematology (Internal Medicine) Physician in Baltimore, Maryland.
- 619
- Part D claims, 2023
- 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.
Aaron Rapoport, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
619 Top 31% higher than 69% 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)
Aaron Rapoport, 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 Aaron Rapoport, M.D.?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
619 11% vs specialty avg
Specialty distribution in Maryland
How Hematology (Internal Medicine) Physician compares to other specialties among Maryland 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).
Aaron Rapoport, M.D. appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding M.D. credentials at 22 S GREENE ST, Baltimore, MD, 21201, with a listed phone of (410) 328-1230. NPI 1356309280 was issued on 05/02/2006.
Medicare Part D records for calendar year 2023 show 619 prescription claims written by this provider, covering 79 Medicare beneficiaries and totaling roughly $813K in drug spend, with an opioid prescribing rate of 6.8%.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,436 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 | 1356309280 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/02/2006 |
Hospital and facility affiliations
Facilities where Aaron Rapoport, 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.
University OF Maryland Oncology Associates PA
Baltimore, MD
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Aaron Rapoport, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$54
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
619
Total Claims
$813K
Total Drug Cost
79
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 813
- Total Day Supply
- 21,991
- Generic Drug Cost
- $113K
- Opioid Claims
- 42 (6.8% rate)
- Antibiotic Claims
- 100
Patient Demographics
- Average Patient Age
- 71.5 years
- Avg HCC Risk Score
- 3.07
- Gender Split
- 47% female / 53% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Aaron Rapoport, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Acyclovir
Acyclovir
84 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
76 claims
- Valacyclovir
Valacyclovir
57 claims
- Imbruvica 32
Imbruvica
32 claims
- Ondansetron Hcl 22
Ondansetron Hcl
22 claims
- Metoprolol Tartrate 20
Metoprolol Tartrate
20 claims
- Prochlorperazine M… 18
Prochlorperazine Maleate
18 claims
- Gabapentin 16
Gabapentin
16 claims
| Drug | Claims |
|---|---|
| Acyclovir | 84 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 76 |
| Valacyclovir Valacyclovir Hcl | 57 |
| Imbruvica Ibrutinib | 32 |
| Ondansetron Hcl | 22 |
| Metoprolol Tartrate | 20 |
| Prochlorperazine Maleate | 18 |
| Gabapentin | 16 |
| Atovaquone | 14 |
| Pantoprazole Sodium | 14 |
* 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 MD →
All providers in Maryland →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Aaron Rapoport, M.D. fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,436
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Aaron Rapoport, M.D.'s 619 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Rapoport.
Devika Agrawal
Baltimore, MD
Dr. Charles Bolan
M.D.
Bethesda, MD
Dr. Michael Cole
PHD
Baltimore, MD
Dr. Patrick Cross
MD
Greenbelt, MD
Dr. Harish Dave
M.D.
Rockville, MD
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 Maryland 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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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Aaron Rapoport, M.D.'s specialty? ▼
Aaron Rapoport, M.D. specializes in Hematology (Internal Medicine) Physician and practices in Baltimore, Maryland. Credentials: M.D..
How much does Aaron Rapoport, M.D. prescribe under Medicare Part D? ▼
In 2023, Aaron Rapoport, M.D. wrote 619 Medicare Part D claims totaling $813K in drug costs for 79 beneficiaries.
Where is Aaron Rapoport, M.D. located? ▼
Aaron Rapoport, M.D. is located at 22 S GREENE ST, Baltimore, MD, 21201. Phone: (410) 328-1230.
What is Aaron Rapoport, M.D.'s NPI number? ▼
Aaron Rapoport, M.D.'s National Provider Identifier (NPI) is 1356309280, issued on 05/02/2006.
Does Aaron Rapoport, M.D. prescribe opioids? ▼
Yes, Aaron Rapoport, M.D. had 42 opioid claims in 2023 with an opioid prescribing rate of 6.8%.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,436 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 Aaron Rapoport, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Aaron Rapoport, M.D.'s most frequently prescribed drugs include Acyclovir, Sulfamethoxazole-Trimethoprim, Valacyclovir. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Aaron Rapoport, M.D. accept Medicare? ▼
Aaron Rapoport, M.D. appears in CMS Medicare data with 619 Part D claims and 79 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Aaron Rapoport, M.D.'s credentials? ▼
Aaron Rapoport, M.D.'s NPI is 1356309280 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.