Ellen L. Ziaja, MD
Radiation Oncology Physician · Summit, WI
Ellen L. Ziaja, MD is a radiation oncology physician with a practice address in Summit, Wisconsin, and NPI 1104868181, issued on Jun 12, 2006. Check the license (Wisconsin 39952, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ellen L. Ziaja
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 39952 WI
Self-reported in NPPES; status is on the state search - Practice location
- 36500 Aurora Dr, Summit, WI 53066
- Phone
- (262) 434-1800
- Enumerated
- Jun 12, 2006
- Record last updated
- Sep 15, 2023
- Fax
- (414) 649-5309
- Medicaid ID
- 32461100 WI
- Medicare enrollment
- Enrolled (PECOS I20040719000106); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 1993
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 153 in Wisconsin → Look up another NPI →
Also registered at 36500 Aurora Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ellen L. Ziaja in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 39952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% fewer Medicare Part D claims than the average radiation oncology physician in 2024
54 Medicare Part D claims for 36 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Radiation Oncology Associates LtdSheboygan, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ellen L. Ziaja among 153 radiation oncology physician records in Wisconsin
Ellen L. Ziaja, MD is one of 153 radiation oncology physician records with a practice address in Wisconsin. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 55% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated1993 · median 2008 among the 119 with a school on file
- Record last updated2023 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Wisconsin
There are 153 radiation oncology physician records in Wisconsin.
All 153 in Wisconsin → Every provider in Summit → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Stanley Gutiontov, MDSheboygan, WI 530811063803963
- Kiernan Minehan, M.D.Sheboygan, WI 530811407834112
- Stuart Blacher, MDBrookfield, WI 530451154375988
- Shannon Offerman, MDBrookfield, WI 530451356520506
- Eva Christensen, M.D., PH.D.Mequon, WI 530921558598441
- E Czyzewski, MDJohnson Creek, WI 530381730295270
- Jessica Schuster, MDJohnson Creek, WI 530381861711822
- Perry Gould, MDGrafton, WI 530241417990300
Common questions
What is Ellen L. Ziaja, MD's NPI number?
Ellen L. Ziaja, MD's National Provider Identifier (NPI) is 1104868181, issued on Jun 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ellen L. Ziaja, MD located?
The NPPES record lists a practice address at 36500 Aurora Dr, Summit, WI, 53066. Phone: (262) 434-1800. Providers update this record themselves, so call before visiting.
How can I verify Ellen L. Ziaja, MD's license?
NPPES lists Wisconsin license number 39952, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ellen L. Ziaja, MD prescribe under Medicare Part D?
In 2024, Ellen L. Ziaja, MD had 54 Medicare Part D claims for 36 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.