NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1164404422 M.D.
Verify on CMS → John Inzerillo, M.D.
Hematology & Oncology Physician in Washington, North Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 11,215 in Hematology & Oncology 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
3K
Medicare Part D claims · 433 beneficiaries · Hematology & Oncology Physician avg: 847
MIPS score
98.3/100
▲ 15 pts above national avg 83.1 · Exceptional
Industry payments
$250.17
10 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
John Inzerillo, M.D. reported a CMS MIPS final score of 98.3/100 - above the 83.1 national average - and filed 2,559 Medicare Part D claims in 2023.
- 98.3/100
- MIPS score · +15 vs avg
- 3K
- 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.
John Inzerillo, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
98 Top 11% higher than 89% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where John Inzerillo, M.D. sits
This provider among hematology & oncology physician peers
Across the 4,233 hematology & oncology physician providers who report both Medicare Part D prescribing and a MIPS quality score, John Inzerillo, M.D. writes more Part D claims than 96% of them and scores higher on MIPS quality than 87% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one hematology & oncology physician peer from a representative sample of 60; the gold marker is John Inzerillo, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
John Inzerillo, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 John Inzerillo, M.D.?
High performer (top quartile)Primary specialty
Hematology & Oncology Physician
Medicare Part D claims
2,559 202% vs specialty avg
MIPS final score
98.3/100 15.2 pts vs avg
Specialty distribution in North Carolina
How Hematology & Oncology Physician compares to other specialties among North Carolina providers
Medicare quality performance, MIPS
John Inzerillo, M.D.'s 2023 MIPS final score plotted against the Hematology & Oncology Physician national average
- MIPS Final Score
- 98.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hematology & Oncology Physician) - 98.3/100 vs national avg 83.1
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).
John Inzerillo, M.D. appears in the CMS NPPES registry as a Hematology & Oncology Physician provider holding M.D. credentials at 1209 BROWN ST, Washington, NC, 27889, with a listed phone of (252) 975-4308. NPI 1164404422 was issued on 11/14/2005.
Medicare Part D records for calendar year 2023 show 2,559 prescription claims written by this provider, covering 433 Medicare beneficiaries and totaling roughly $4.4 million in drug spend, with an opioid prescribing rate of 10.0%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 98.3/100 for the 2023 performance year (Quality 82.9), compared with the national average of 83.1.
Hematology & Oncology Physician is a mid-sized specialty nationwide, with 11,215 enrolled providers across 54 states and an average of 847 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 | 1164404422 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 11/14/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
98.333
Final Score
Avg: 83.1
82.9398
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where John Inzerillo, 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.
Vidant Medical Group LLC
Washington, NC
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 John Inzerillo, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$250
Largest payer
PFIZER 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.
2,559
Total Claims
$4.4M
Total Drug Cost
433
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,378
- Total Day Supply
- 86,138
- Generic Drug Cost
- $738K
- Opioid Claims
- 255 (10.0% rate)
- Antibiotic Claims
- 80
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 2.19
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 42, 65-74: 166, 75-84: 168, 85+: 57
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Inzerillo, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Potassium Chloride
Potassium Chloride
319 claims
- Anastrozole
Anastrozole
156 claims
- Oxycodone Hcl 95
Oxycodone Hcl
95 claims
- Abiraterone Acetate 92
Abiraterone Acetate
92 claims
- Prednisone 92
Prednisone
92 claims
- Prochlorperazine M… 79
Prochlorperazine Maleate
79 claims
- Ondansetron Odt 68
Ondansetron Odt
68 claims
- Hydroxyurea 65
Hydroxyurea
65 claims
| Drug | Claims |
|---|---|
| Potassium Chloride | 319 |
| Anastrozole | 156 |
| Oxycodone Hcl | 95 |
| Abiraterone Acetate | 92 |
| Prednisone | 92 |
| Prochlorperazine Maleate | 79 |
| Ondansetron Odt Ondansetron | 68 |
| Hydroxyurea | 65 |
| Temazepam | 60 |
| Dexamethasone | 58 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology & Oncology Physician in NC →
All providers in North Carolina →
Compare specialties →
Hematology & Oncology Physician Overview
How John Inzerillo, M.D. fits within the Hematology & Oncology Physician landscape nationally.
11,215
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
847
Avg Claims per Provider
John Inzerillo, M.D.'s 2,559 claims are above the specialty average of 847.
Nearby Hematology & Oncology Physician Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as Inzerillo.
Dr. Jorge Abdallah
MD
Greenville, NC
Thomas Aberant
Durham, NC
Dr. Haritha Ackula
MBBS
Kinston, NC
Dr. Soheir Adam
MD
Durham, NC
Dr. Matthew Alberti
DO
Monroe, NC
Compare Hematology & Oncology 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 North Carolina medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology & Oncology 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 John Inzerillo, M.D.'s specialty? ▼
John Inzerillo, M.D. specializes in Hematology & Oncology Physician and practices in Washington, North Carolina. Credentials: M.D..
How much does John Inzerillo, M.D. prescribe under Medicare Part D? ▼
In 2023, John Inzerillo, M.D. wrote 2,559 Medicare Part D claims totaling $4.4M in drug costs for 433 beneficiaries.
What is John Inzerillo, M.D.'s Medicare quality score? ▼
John Inzerillo, M.D. has a CMS MIPS Final Score of 98.3/100 (Quality: 82.9). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is John Inzerillo, M.D. located? ▼
John Inzerillo, M.D. is located at 1209 BROWN ST, Washington, NC, 27889. Phone: (252) 975-4308.
What is John Inzerillo, M.D.'s NPI number? ▼
John Inzerillo, M.D.'s National Provider Identifier (NPI) is 1164404422, issued on 11/14/2005.
Does John Inzerillo, M.D. prescribe opioids? ▼
Yes, John Inzerillo, M.D. had 255 opioid claims in 2023 with an opioid prescribing rate of 10.0%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,215 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 847 Medicare Part D claims per year.
What drugs does John Inzerillo, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, John Inzerillo, M.D.'s most frequently prescribed drugs include Potassium Chloride, Anastrozole, Oxycodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Inzerillo, M.D. accept Medicare? ▼
John Inzerillo, M.D. appears in CMS Medicare data with 2,559 Part D claims and 433 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Inzerillo, M.D.'s credentials? ▼
John Inzerillo, M.D.'s NPI is 1164404422 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.