William Joseph Stephan, MD
Interventional Cardiology Physician · Naperville, IL
William Joseph Stephan, MD is an interventional cardiology physician with a practice address in Naperville, Illinois, and NPI 1851344931, issued on May 18, 2006. Check the license (Illinois 036.090607, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- William Joseph Stephan
- Credential
- MD
- Primary taxonomy
- Interventional Cardiology Physician 207RI0011X
- License numbers
- 036.090607 IL
036090607 IL
Self-reported in NPPES; status is on the state search - Practice location
- 10 Martin Ave Ste 200, Naperville, IL 60540
- Phone
- (630) 600-0700
- Enumerated
- May 18, 2006
- Record last updated
- Apr 24, 2025
- Fax
- (630) 600-0701
- Medicare enrollment
- Enrolled (PECOS I20040601000300); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest interventional cardiology physician records → All 320 in Illinois → Look up another NPI →
Also registered at 10 Martin Ave Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ryan AlbertsMedical Physician Assistant1346682622
- Aman Ali, M.D.Cardiovascular Disease Physician1679753164
- Christine Bolden, APRN, CNPAdult Health Nurse Practitioner1265919112
- Stanley Clark, MDCardiovascular Disease Physician1629016951
- Kimberly Clohecy, NPAcute Care Nurse Practitioner1386655579
- Terri Colby, NPAdult Health Nurse Practitioner1881941698
Verify William Joseph Stephan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.090607Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% more Medicare Part D claims than the average interventional cardiology physician in 2024
5,584 Medicare Part D claims for 729 beneficiaries, against an average of 3,179 among the 6,605 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Metoprolol Succinate804 claims
- Atorvastatin Calcium732 claims
- Rosuvastatin Calcium374 claims
- Losartan Potassium338 claims
- Amlodipine Besylate241 claims
- Clopidogrel214 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $4,367.06
32 payments; by number, the most common kind was travel and lodging; the largest payer was Edwards Lifesciences Corporation. The 6,394 providers of this specialty with any payment received $7,062.29 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
3 hospitals and group practices
- Edward HospitalNaperville, IL · Acute Care Hospitals3 of 5 stars
- Cardiovascular Institute Gpe IncNaperville, IL
- Midwest Cardiovascular Institute SCNaperville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
William Joseph Stephan among 320 interventional cardiology physician records in Illinois
William Joseph Stephan, MD is one of 320 interventional cardiology physician records with a practice address in Illinois. 96% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 96% of these records are
- In the CMS Doctors and Clinicians fileYes · 87% of these records are
- Graduated1987 · median 2002 among the 278 with a school on file
- Record last updated2025 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0011X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Interventional Cardiology Physician providers in Illinois
There are 320 interventional cardiology physician records in Illinois.
All 320 in Illinois → Every provider in Naperville → Interventional Cardiology Physician nationwide →
The 8 interventional cardiology physician records with the nearest ZIP codes
- Ehab Dababneh, MDNaperville, IL 605401003255308
- Mark Duerinck, MDNaperville, IL 605401689612681
- Mark Goodwin, MDNaperville, IL 605401639125867
- Li Shien Low, M.D.Naperville, IL 605401760643373
- Krishna Nagendran, MDNaperville, IL 605401265674691
- Mark Pelka, M.D.Naperville, IL 605401114389418
- Abdullah Quddus, M.D.Naperville, IL 605401578851515
- Anand Ramanathan, MDNaperville, IL 605401306892229
Common questions
What is William Joseph Stephan, MD's NPI number?
William Joseph Stephan, MD's National Provider Identifier (NPI) is 1851344931, issued on May 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Joseph Stephan, MD located?
The NPPES record lists a practice address at 10 Martin Ave Ste 200, Naperville, IL, 60540. Phone: (630) 600-0700. Providers update this record themselves, so call before visiting.
How can I verify William Joseph Stephan, MD's license?
NPPES lists Illinois license number 036.090607, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Joseph Stephan, MD prescribe under Medicare Part D?
In 2024, William Joseph Stephan, MD had 5,584 Medicare Part D claims for 729 beneficiaries; the average among interventional cardiology physician prescribers was 3,179. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.