William Stephan, MD
NPI 1851344931 · Interventional Cardiology Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Interventional Cardiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Stephan, MD is a Interventional Cardiology Physician provider in Naperville, IL (NPI 1851344931).
Provider details
- NPI number
- 1851344931
- Entity type
- Individual
- Primary specialty
- Interventional Cardiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036.090607 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
6,007 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| 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'SG2211 | 1,050 | $17 |
| Rubidium Rb-82, Diagnostic, Per Study Dose, Up to 60 MillicuriesA9555 | 935 | $519 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 828 | $130 |
| Exercise Or Drug-Induced Heart Stress Test With Electrocardiogram (ecg) With Review By Physician93018 | 681 | $14 |
| Nuclear Medicine Studies of Blood Flow in Heart Muscle at Rest and With Stress With Concurrent Ct Scan78431 | 483 | $1,738 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 55 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 804 | 239 |
| Atorvastatin Calcium | 732 | 209 |
| Rosuvastatin Calcium | 374 | 119 |
| Losartan Potassium | 338 | 101 |
| Amlodipine Besylate | 241 | 74 |
| Lisinopril | 214 | 61 |
| Clopidogrel Bisulfate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,367 across 32 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-18
- Last updated
- 2025-04-24
- Certified
- 2025-04-24
Frequently asked questions
- What is William Stephan's NPI number?
- William Stephan's National Provider Identifier (NPI) is 1851344931, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Stephan's specialty?
- William Stephan is listed in the NPPES registry with a primary specialty of Interventional Cardiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Stephan located?
- William Stephan's practice location on file with NPPES is 10 Martin Ave Ste 200, Naperville, IL 60540-6535.
- What is William Stephan's phone number?
- The practice phone number listed in the NPPES registry for William Stephan is (630) 600-0700.
- Does William Stephan accept Medicare?
- William Stephan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Stephan's NPI active?
- Yes — William Stephan's NPI (1851344931) is active in the NPPES registry as of the last update on 2025-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.