Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Eric P. Xanthopoulos, MD

Individual provider Radiation Oncology Physician · NPI 1457693079

Dr. Eric P. Xanthopoulos, MD practises Radiation Oncology in Beloit, Wisconsin. Graduated from Columbia University College of Physicians and Surgeons in 2003, 23 years ago. Practices with Beloit Health System Inc, a 141-clinician group and accepts Medicare assignment. Licensed in Illinois and Wisconsin.

Years since qualifying
23
Trained at
Columbia University College of Physicians and Surgeons
Licensed in
IL, WI
In the registry since
2013
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Partly verified

Some contact details are missing from the federal record.

Beloit Health System Uw Cancer Center 1670 Lee Ln
Beloit, WI 53511-3935
Phone: (608) 364-5253
Fax: (608) 364-5252
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 68909-20 (WI)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 036-146949 (IL)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1457693079
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 21, 2013
Last updated in NPPESMarch 31, 2021
Certification dateMarch 31, 2021

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolCOLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS
Graduated 2003 (23 years in practice)
Group practice Beloit Health System Inc — 141 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients181
Services billed 3,920 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $548 26 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Beloit Health System Hospital · Beloit, WI · listed as Beloit Health System Inc
  • Uw Health Hospital · Rockford, IL
  • Beloit Regional Hospice Hospice · Beloit, WI

Colleagues at Beloit Health System Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 141 clinicians in the practice; 12 are shown here.