Quick answers
- Does Ilias Oikonomopoulos accept Medicare assignment?
- Yes. Medicare's clinician data says Ilias Oikonomopoulos accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ilias Oikonomopoulos see?
- In 2024, CMS data shows 282 Original Medicare patients and 5,416 services for Ilias Oikonomopoulos. This counts Original Medicare only and measures volume, not quality.
- What is Ilias Oikonomopoulos's NPI number?
- 1639334832. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ilias Oikonomopoulos, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 282 |
|---|---|
| Services billed to Medicare | 5,416 |
| Different services or procedures | 39 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Injection, denosumab, 1 mg (J0897)2,340 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)298 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)208 services
- Insertion of needle into vein for collection of blood sample (36415)194 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)112 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol63%
- Arthritis63%
- High blood pressure62%
- Osteoporosis36%
- Diabetes23%
- Anxiety23%
Hospitals where Ilias Oikonomopoulos works
Medicare's Facility Affiliation Data lists Ilias Oikonomopoulos at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Fort Memorial HospitalFort Atkinson, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520071
- Southwest Health CenterPlatteville, WI · Critical Access Hospital · Emergency services: listed by Medicare · CCN 521354
- SSM Health St Mary's Hospital - JanesvilleJanesville, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520208
- SSM Health St Mary's Hospital - MadisonMadison, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520083
- Upland Hills HealthDodgeville, WI · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 521352
Practice locations
Addresses where Ilias Oikonomopoulos is enrolled with Medicare (CMS data updated October 2, 2026).
- 1821 S Stoughton RdMadison, WI 53716 (608) 260‑6000
Group practices
Medicare enrollment lists Ilias Oikonomopoulos as a member of this group (CMS data updated October 2, 2026).
- Dean Health Systems Inc1,159 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Madison
Clinicians with the same Medicare primary specialty in Madison, WI — not a recommendation.
Other clinicians in Dean Health Systems Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2004 (22 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1639334832 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians