NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1649275124 MD
Verify on CMS → Robert Slease, MD
Hematology (Internal Medicine) Physician in Newark, Delaware.
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
26
Medicare Part D claims · 13 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Generic prescribing
46%
generic claims · 54% 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
Robert Slease, MD filed 26 Medicare Part D claims in 2023 as a Hematology (Internal Medicine) Physician in Newark, Delaware, prescribing 46% generic.
- 26
- Part D claims, 2023
- 46%
- generic prescribing
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.
Robert Slease, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
26 0th percentile higher than 0% 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-eligible specialty (heuristic, not verified)
Robert Slease, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Robert Slease, MD?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
26 96% vs specialty avg
Specialty distribution in Delaware
How Hematology (Internal Medicine) Physician compares to other specialties among Delaware 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).
Robert Slease, MD appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding MD credentials at 4701 OGLETOWN STANTON RD, Newark, DE, 19713, with a listed phone of (302) 737-7700. NPI 1649275124 was issued on 06/20/2005.
Medicare Part D records for calendar year 2023 show 26 prescription claims written by this provider, covering 13 Medicare beneficiaries and totaling roughly $83K in drug spend, split 54% brand-name and 46% generic by claim count.
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 | 1649275124 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/20/2005 |
Brand vs generic prescribing mix · Brand-heavy
Robert Slease, MD - brand share 54.0%
Hematology (Internal Medicine) Physician average
54% brand-name claims vs 46% generic, on 26 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.
26
Total Claims
$83K
Total Drug Cost
13
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 47
- Total Day Supply
- 1,428
- Brand vs Generic
- 54% brand / 46% generic
- Brand Drug Cost
- $82K
- Generic Drug Cost
- $275
Patient Demographics
- Average Patient Age
- 67.6 years
- Avg HCC Risk Score
- 1.64
More Hematology (Internal Medicine) Physician in DE →
All providers in Delaware →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Robert Slease, MD 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
Robert Slease, MD's 26 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Delaware
Other clinicians with the same primary specialty enrolled in Delaware, drawn from the same CMS NPPES roster as Slease.
Dr. Philip Blatt
MD
Newark, DE
Dr. Kathrina Chua
M.D.
Dover, DE
Dr. Mohamad Ghraowi
MD
Dover, DE
Dr. Scott Hall
MD
Newark, DE
Dr. Iftekhar Khan
M.D.
Milford, DE
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 Delaware 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 Robert Slease, MD's specialty? ▼
Robert Slease, MD specializes in Hematology (Internal Medicine) Physician and practices in Newark, Delaware. Credentials: MD.
How much does Robert Slease, MD prescribe under Medicare Part D? ▼
In 2023, Robert Slease, MD wrote 26 Medicare Part D claims totaling $83K in drug costs for 13 beneficiaries.
Where is Robert Slease, MD located? ▼
Robert Slease, MD is located at 4701 OGLETOWN STANTON RD, Newark, DE, 19713. Phone: (302) 737-7700.
What is Robert Slease, MD's NPI number? ▼
Robert Slease, MD's National Provider Identifier (NPI) is 1649275124, issued on 06/20/2005.
Does Robert Slease, MD prescribe more brand-name or generic drugs? ▼
Robert Slease, MD's prescribing is 54% brand-name and 46% generic drugs by claim count, with $82K in brand drug costs.
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.
Does Robert Slease, MD accept Medicare? ▼
Robert Slease, MD appears in CMS Medicare data with 26 Part D claims and 13 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Slease, MD's credentials? ▼
Robert Slease, MD's NPI is 1649275124 with credentials MD. 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.