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Dr. Mark T. Fleming, MD

Hematology & Oncology (Hematology & Oncology Physician)

  • Medicare participating

At a glance

Years since graduation
27
In the NPI registry since
2006
Medicare patients seen, 2024
1,051

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is

Education and training

  • 1999Medical school: University of Toledo College of Medicine
  • 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

  • Hematology & Oncology Physician primary
    VA license 0101240180

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Hematology & Oncology per capita by county →

Where they work

Hospitals

Medical groups

Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.

Medicare patients and services

Medicare patients, 2024
1,051
Services billed
236,169
Patients’ average age
75
Most frequent Medicare services, 2023
ServiceTimesPatients
Injection, pembrolizumab, 1 mg56,40048
Injection, nivolumab, 1 mg28,56018
Injection, darbepoetin alfa, 1 microgram (non-esrd use)17,20030
Injection, aprepitant, 1 mg15,21035
Injection, docetaxel, 1 mg11,06724
Injection, fosaprepitant, 1 mg8,70013
Injection, azacitidine, 1 mg6,80016
Injection, denosumab, 1 mg4,80027
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count3,328716
Injection, dexamethasone sodium phosphate, 1 mg3,11088

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Medicare prescriptions

Most prescribed drugs, Medicare Part D 2024
DrugPrescriptions
Prednisone
Other prescribers in Hampton, VA
197
Abiraterone Acetate138
Erleada (apalutamide)84
Cabometyx (cabozantinib s-malate)60
Xtandi (enzalutamide)55
Eliquis (apixaban)
Other prescribers in Hampton, VA
54
Dexamethasone
Other prescribers in Hampton, VA
46
Oxycodone-Acetaminophen (oxycodone hcl/acetaminophen)
Other prescribers in Hampton, VA
36
Promethazine Hcl
Other prescribers in Hampton, VA
33
Xarelto (rivaroxaban)
Other prescribers in Hampton, VA
32

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

Payments from drug and device companies

In 2025, 5 companies reported 6 payments worth $6,442 in total to this clinician.

By type
Consulting Fee$6,150
Compensation for services other than consulting (speaking, faculty)$150
Food and Beverage$107
Education$35.06

What the payments were for

Largest payments other than meals
DateCompanyWhat it was forAmount
Aug 27, 2025Novartis Pharmaceuticals Corporation
Aug 27, 2025
Consulting Fee$2,800
Dec 15, 2025Merck Sharp & Dohme LLC
Dec 15, 2025
Consulting Fee
Company’s descriptionPayment made to Third Party Organization not to Physician.
$2,240
Mar 28, 2025Janssen Biotech, Inc.
Mar 28, 2025
Consulting Fee
ERLEADA · Oncology
$1,110
Jul 19, 2025Array Biopharma Inc
Jul 19, 2025
Compensation for services other than consulting (speaking, faculty)
LORBRENA; BRAFTOVI; MEKTOVI · ONCOLOGY
$150
Nov 13, 2025AstraZeneca Pharmaceuticals LP
Nov 13, 2025
Education
IMFINZI · Oncology · in-kind
Company’s descriptionJournal Article
$35.06

Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.

From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.

Who received the most in Virginia →

Industry-funded research

Named as a principal investigator on 25 industry-funded studies in 2025, from 11 companies. The companies reported $1,095,360 in research payments for these studies, mostly to the institutions running them.

  • An International Prospective Open-label, Multi-center, Randomized Phase III Study comparing [177Lu] Lu-PSMA-617 versus Observation to delay castration or disease recurrence in adult male patients with PSMA positive Ol…
    Novartis Pharmaceuticals Corporation
  • An Open-label, Randomized, Phase III Study Comparing 177Lu-PSMA-617 in Combination With Standard of Care, Versus Standard of Care Alone, in Adult Male Patients With Metastatic Hormone Sensitive Prostate Cancer (mHSPC)
    Novartis Pharmaceuticals Corporation
  • A Dose-Escalation and Expansion Study of the Safety and Efficacy of XL092 in Combination with Immuno-Oncology Agents in Subjects with Unresectable Advanced or Metastatic Solid Tumors
    Exelixis Inc.
  • A Phase 3, Randomized, Study of Neoadjuvant Chemotherapy alone versus Neoadjuvant Chemotherapy plus Nivolumab or Nivolumab and BMS-986205, Followed by Continued Post-Surgery Therapy with Nivolumab or Nivolumab and BMS…
    E.r. Squibb & Sons, L.l.c.
  • A Phase III Double-Blind Randomised Placebo-Controlled Study Assessing the Efficacy and Safety of Capivasertib + Docetaxel Versus Placebo + Docetaxel as Treatment for Patients with Metastatic Castration Resistant Pros…
    AstraZeneca UK Limited
  • A Phase 3, Open-label, Multicenter, Randomized Study of Xaluritamig vs Cabazitaxel or Second Androgen Receptor-Directed Therapy in Subjects With Metastatic Castration-Resistant Prostate Cancer Previously Treated With …
    Amgen Inc.
  • A Study of TAR200 in Combination With Cetrelimab Versus Concurrent Chemoradiotherapy in Participants With Muscle invasive Bladder Cancer MIBC of the Bladder
    Janssen Research & Development, LLC
  • PSMAfore: A Phase III, Open-label, Multi-Center, Randomized Study Comparing 177Lu-PSMA-617 vs. a Change of Androgen Receptor-directed Therapy in the Treatment of Taxane Nave Men With Progressive Metastatic Castrate Re…
    Novartis Pharmaceuticals Corporation
  • A Study to Compare Chemotherapy Alone Versus Chemotherapy Plus Nivolumab or Nivolumab and BMS-986205, Followed by Continued Therapy After Surgery With Nivolumab or Nivolumab and BMS-986205 in Participants With Muscle Invasive Bladder Cancer
    E.r. Squibb & Sons, L.l.c. · Completed · NCT03661320
  • A Phase 1 Study Evaluating the Safety, Tolerability, Pharmacokinetics, and Efficacy of AMG 509 in Subjects With Metastatic Castration-Resistant Prostate Cancer
    Amgen Inc.

From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.

Other Hematology & Oncology clinicians in Hampton

Sources

NPI registry (CMS NPPES, November 2026; record last updated March 7, 2023), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1457383663. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.