Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John Frederick Deeken, MD

Individual provider Hematology & Oncology Physician · NPI 1659390755

John Frederick Deeken, MD is a 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.

See every abbreviation used in this directory →

Practice location Address checks out

8081 Innovation Park Dr
Fairfax, VA 22031-4867
Phone: (571) 472-4724
Fax: (571) 472-0241
Show map & directions

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
Mailing addressPo Box 37174, Baltimore, MD 21297-3174

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

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