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

Mark K Ono, MD

Individual provider Radiation Oncology Physician · NPI 1427022144

Mark K Ono, MD is a Radiation Oncology in Scottsdale, Arizona. Graduated from University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb) in 1990, 36 years ago. Practices with Bayhealth Medical Center, Inc, a 401-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Arizona and Delaware.

Years since qualifying
36
Trained at
University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb)
Licensed in
AZ, DE
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 PO Box

The provider listed a PO Box rather than a street location, so this is not a walk-in address.

PO Box 4571
Scottsdale, AZ 85261-4571
Phone: (480) 254-8613
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 640 S State St, Dover, DE 19901-3530 — (302) 744-7000

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 34123 (AZ)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence C1-0028619 (DE)

Record details

NPI number1427022144
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 17, 2006
Last updated in NPPESSeptember 11, 2025
Certification dateSeptember 11, 2025

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated 1990 (36 years in practice)
Group practice Bayhealth Medical Center, Inc — 401 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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