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

Ellen L Ziaja, MD

Individual provider Radiation Oncology Physician · NPI 1104868181

Ellen L Ziaja, MD is a Radiation Oncology in Summit, Wisconsin. Graduated from Wayne State University School of Medicine in 1993, 33 years ago. Practices with Radiation Oncology Associates Ltd, a 23-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
33
Trained at
Wayne State University School of Medicine
Licensed in
WI
In the registry since
2006
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

36500 Aurora Dr
Summit, WI 53066-4899
Phone: (262) 434-1800
Fax: (414) 649-5309
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 39952 (WI)

Record details

NPI number1104868181
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 12, 2006
Last updated in NPPESSeptember 15, 2023
Certification dateSeptember 15, 2023

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolWAYNE STATE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1993 (33 years in practice)
Group practice Radiation Oncology Associates Ltd — 23 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations7 on file with Medicare