Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John Frederick Deeken, MD

Individual provider Hematology & Oncology Physician · NPI 1659390755

John Frederick Deeken, MD practises Medical Oncology in Fairfax, Virginia. Graduated from Georgetown University School of Medicine in 2001, 25 years ago. Practices with Inova Health Care Services, a 1,827-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in District of Columbia and Virginia.

Years since qualifying
25
Trained at
Georgetown University School of Medicine
Licensed in
DC, VA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

8081 Innovation Park Dr
Fairfax, VA 22031-4867
Phone: (571) 472-4724
Fax: (571) 472-0241
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 3800 Reservoir Rd Nw, Washington, DC 20007-2113 — (202) 444-2198
  • 3300 Gallows Rd, Falls Church, VA 22042-3307 — (703) 776-4001

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 0101235487 (VA)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence 036169 (DC)

Record details

NPI number1659390755
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 19, 2006
Last updated in NPPESFebruary 25, 2022
Certification dateFebruary 25, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice Inova Health Care Services — 1827 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients74
Services billed 149 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Consulting Fee $2,240 1 payment

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Inova Health Care Services

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1827 clinicians in the practice; 12 are shown here.

Other providers in Fairfax