Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William Joseph Stephan, MD

Individual provider Cardiovascular Disease Physician · NPI 1851344931

William Joseph Stephan, MD is an Interventional Cardiology in Naperville, Illinois. Graduated from Tufts University School of Medicine in 1987, 39 years ago. Practices with Cardiovascular Institute Gpe Inc, a 51-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
39
Trained at
Tufts University School of Medicine
Licensed in
IL
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

10 Martin Ave Ste 200
Naperville, IL 60540-6535
Phone: (630) 600-0700
Fax: (630) 600-0701
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Interventional Cardiology Physician (primary) Taxonomy 207RI0011X · Licence 036.090607 (IL)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence 036.090607 (IL)
Interventional Cardiology Physician Taxonomy 207RI0011X · Licence 036090607 (IL)

Record details

NPI number1851344931
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 18, 2006
Last updated in NPPESApril 24, 2025
Certification dateApril 24, 2025
Mailing address10 Martin Ave Ste 200, Naperville, IL 60540-6535

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERVENTIONAL CARDIOLOGY
Also practisesCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolTUFTS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1987 (39 years in practice)
Group practice Cardiovascular Institute Gpe Inc — 51 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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