ELLEN L ZIAJA (MD) – Radiation Oncology Physician, NPI 1104868181
Radiation Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
186 RADIATION ONCOLOGY in WI
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Provider Addresses for ELLEN L ZIAJA (MD)
Aurora Saint Luke's Medical Center, 2900, West Oklahoma Avenue, Southgate, Milwaukee, Milwaukee County, Wisconsin, 53215, United States
MILWAUKEE, WI 532154330
Phone: (414) 649-6420
Fax: (414) 649-5309
Type: Location
36500 AURORA DR
SUMMIT, WI 530664899
Phone: (262) 434-1800
Fax: (414) 649-5309
Type: Location
11516, North Port Washington Road, Mequon, Ozaukee County, Wisconsin, 53092, United States
STE 202
MEQUON, WI 530923441
Phone: (262) 241-5040
Fax: (262) 251-5261
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-07-19
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040719000106 | I | Radiation Oncology | WI | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 77014 | Ct guidance for insertion of radiation therapy fields | 560 | 99 | $0 |
| 77427 | Radiation treatment management, 5 treatment sessions | 194 | 85 | $0 |
| 77300 | Calculation of radiation therapy dose | 108 | 37 | $0 |
| 77334 | Design and construction of complex radiation treatment device | 91 | 49 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 55 | 55 | $0 |
Insurance plans in this area (ZIP 53215)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| RADIATION ONCOLOGY | WI | 77427 | Radiation treatment management, 5 treatments | 253 | 67 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Radiation Oncology | WI | |
| Radiation Oncology | WI | |
| - | WI | |
| Radiation Oncology | CA | |
| Radiation Oncology | CO | |
| Radiation Oncology | WI | |
| - | WI | |
| Radiation Oncology | WI | |
| Radiation Oncology | WI | |
| - | WI |
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