William Joseph Stephan, MD
NPI 1851344931ActiveIndividual· Internal Medicine, Interventional Cardiology· Naperville, IL
Internal Medicine, Interventional Cardiology (MD) in Naperville, Illinois, trained at Tufts University School of Medicine (class of 1987). 1,763 Medicare patients in 2024, $1,381,592 paid; nearly all of their 5,584 Part D prescriptions were generic (90%). Cardiva Medical, Inc. was the largest of 3 companies reporting payments in 2025, $416.98 in all, mostly food and beverage.
Overview
| NPI | 1851344931 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 18, 2006 |
| Last updated in NPPES | Apr 24, 2025 |
| Certified by provider | Apr 24, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | 036.090607 | IL |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 036.090607 | IL |
| Internal Medicine, Interventional Cardiology | 207RI0011X | 036090607 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Interventional Cardiology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,763 |
|---|---|
| Services billed | 6,445 across 88 procedure codes |
| Paid by Medicare | $1,381,592 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,584 · 15,144 30-day fills |
|---|---|
| Patients | 729 |
| Total drug cost | $711,707 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Interventional Cardiology |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
Medical groups
- Edward HospitalBolingbrook, IL · 96 clinicians
- Cardiovascular Institute Gpe IncNaperville, IL · 51 clinicians
Hospital affiliations
- Edward HospitalNaperville, IL
- Elmhurst Memorial HospitalElmhurst, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine Delnor Community HospitalGeneva, IL
Industry payments (Open Payments)
- 2025$416.98 · 9 payments from 3 companies
- 2024$4,367 · 32 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Cardiva Medical, Inc. | $248.23 | 7 |
| Medtronic, Inc. | $130.61 | 1 |
| Edwards Lifesciences Corporation | $38.14 | 1 |
What the 2025 payments were for
- Food and Beverage$416.98 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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