Quick answers
- Does Louie N. Kostopoulos accept Medicare assignment?
- Yes. Medicare's clinician data says Louie N. Kostopoulos 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 Louie N. Kostopoulos see?
- In 2024, CMS data shows 748 Original Medicare patients and 3,853 services for Louie N. Kostopoulos. This counts Original Medicare only and measures volume, not quality.
- What is Louie N. Kostopoulos's NPI number?
- 1356431001. 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 Louie N. Kostopoulos, 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 | 748 |
|---|---|
| Services billed to Medicare | 3,853 |
| Different services or procedures | 84 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, adenosine, 1 mg (not to be used to report any adenosine phosphate compounds) (J0153)1,110 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)350 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)149 services
- Heart muscle strain imaging (93356)141 services
- Injection, perflutren lipid microspheres, per ml (Q9957)132 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 blood pressure75%
- High cholesterol75%
- Ischemic heart disease65%
- Arthritis49%
- Chronic kidney disease42%
- Heart failure39%
Hospitals where Louie N. Kostopoulos works
Medicare's Facility Affiliation Data lists Louie N. Kostopoulos 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.
- Aurora Medical CenterGrafton, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520207
- Aurora Medical Center KenoshaKenosha, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520189
- Aurora Medical Center OshkoshOshkosh, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520198
- Aurora St Lukes Medical CenterMilwaukee, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520138
- West Allis Memorial HospitalWest Allis, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520139
Practice locations
Addresses where Louie N. Kostopoulos is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 11; the Medicare profile lists all.
- 1020 N 12th StMilwaukee, WI 53233 (414) 219‑3056
- 12203 N Corporate PkwyMequon, WI 53092
- 14555 W National Ave, 195bNew Berlin, WI 53151 (262) 827‑3290
- 14555 W National Ave, Suite 120New Berlin, WI 53151 (262) 827‑2955
- 2801 W Kinnickinnic River PkwyMilwaukee, WI 53215 (414) 385‑8600
Group practices
Medicare enrollment lists Louie N. Kostopoulos as a member of these groups (CMS data updated October 2, 2026).
- Aurora Medical Group, Inc.3,813 clinicians in the group
- Aurora Advanced Healthcare, Inc.1,124 clinicians in the group
Specialties
- Interventional Cardiologyprimary
Other interventional cardiologists in Milwaukee
Clinicians with the same Medicare primary specialty in Milwaukee, WI — not a recommendation.
Other clinicians in Aurora Medical Group, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1356431001 |
| 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