Mitral Valve InsufficiencyHeart Valve DiseasesAbbott Mitraclip SystemEdwards PASCAL System
Dr. William Joseph Stephan, MD
NPI1851344931PAC ID8527970250
- Medicare services, 2024
- 6,205
- Medicare patients, 2024
- 1,763
- Part D claims, 2024
- 5,584
- Publications
- 1
- Clinical trials
- 1
- Practice address
- 801 South Washington, Naperville, IL 60540
- Practice phone
- Call (630) 527-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Stephan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William Joseph Stephan is an interventional cardiologist in Naperville, Illinois
Dr. Stephan practices at Edward Hospital in Naperville, Illinois, part of Endeavor Health.
Dr. Stephan's NPI, 1851344931, was assigned on May 18, 2006. Dr. Stephan graduated from Tufts University School of Medicine in 1987. Dr. Stephan holds Illinois license 036.090607.
NPI and contact details
- NPI
- 1851344931NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8527970250
- NPI enumeration date
- May 18, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 527-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Joseph Stephan practices at Edward Hospital in Naperville, Illinois
Dr. Stephan's primary practice is Edward Hospital, at 801 South Washington, Naperville, IL 60540 in Du Page County. The practice phone is (630) 527-3000.
- Edward Hospital801 South Washington, Naperville, IL 60540 · Du Page CountyPhone(630) 527-3000
Source: Dmand AI Affiliation Data
Dr. William Joseph Stephan is affiliated with 8 sites of care and 4 medical groups
Dr. Stephan's primary practice is Edward Hospital in Naperville, Illinois, part of Endeavor Health. Dr. Stephan is also affiliated with Northwestern Medicine Central DuPage Hospital. The medical group on file is Edward Hospital. Dmand AI also links Dr. Stephan to 2 more hospitals, 4 group practices and clinics and 3 medical groups, each named with a free account.
Northwestern Medicine Central DuPage HospitalEdward Hospital2 hospitalsNames with a free account4 group practices and clinicsNames with a free account3 medical groupsNames with a free account
See all 12 affiliations for Dr. StephanSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Joseph Stephan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Stephan practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Edward Hospital | Available with a free account |
| +7 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Joseph Stephan is one of 286 interventional cardiologists in Illinois
Interventional cardiology is Dr. Stephan's primary specialty in the NPI Registry, under taxonomy code 207RI0011X. Dr. Stephan is licensed in Illinois.
Specialties and state licenses
- Interventional cardiology, IllinoisPrimary
Interventional cardiologists near Dr. Stephan
Counts of interventional cardiologists with a Dmand AI profile, by place and practice. Each opens the list.
286interventional cardiologists in Illinois13interventional cardiologists in Naperville12interventional cardiologists at Edward Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Joseph Stephan billed Medicare for 6,205 services in 2024
CMS data shows 6,205 Medicare services from Dr. Stephan across 25 procedure codes in 2024, for 1,763 Medicare patients. Medicare paid $1,350,882 for them.
Medicare services, 20246,205
Medicare patients1,763
Paid by Medicare$1.4M
Procedure codes25
Dr. Stephan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 1,4022024: 2,41272%
- Office and hospital visits
- 2023: 1,4712024: 1,472No change
- Tests and treatments
- 2023: 1,4672024: 1,4283%
- Imaging
- 2023: 8322024: 8211%
- Drugs given in the office
- 2023: 1282024: 5359%
- Surgery
- 2023: 122024: 1958%
Where Dr. Stephan's Medicare services took place, 2024
- In an office5,35586%
- In a facility85014%
Dr. Stephan compared with the Illinois median for interventional cardiologists, 2024
- Dr. Stephan
- Illinois median
- Medicare services
- 6,205vs 2,2642.7 times
- Medicare patients
- 1,763vs 96982% above
- Part D claims
- 5,346vs 2,4132.2 times
Medians across 282 interventional cardiologists in Illinois with Dmand AI profiles that report each measure.
Dr. Stephan's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Joseph Stephan treated 1,763 Medicare patients in 2024, average age 76
CMS counts 1,763 Medicare patients who saw Dr. Stephan in 2024. The largest group is 75 to 84, with 780 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Stephan's median patient age at 69, with 39% women.
Medicare patients, 20241,763
Average age76
Average risk score1.32
Also on Medicaid5%
Dr. Stephan's Medicare patients by age, 2024
Dr. Stephan's Medicare patients by sex, 2024
- Women79445%
- Men96955%
Chronic conditions among Dr. Stephan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease61%
- Arthritis50%
- Diabetes35%
- Chronic kidney disease31%
- Atrial fibrillation28%
- Heart failure25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Stephan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women39%
- Men60%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Joseph Stephan wrote 5,584 Medicare Part D claims in 2024
In 2024, Dr. Stephan wrote 5,584 Medicare Part D claims for 729 patients. 90% of them were for generic drugs. CMS names the drug for 5,346 of them, across 54 drugs with 11 or more claims each, at $680,026 in total drug cost. In 2023, CMS named 5,266 claims across 52 drugs.
Part D claims, 20245,584
Drugs named by CMS54
Total drug cost$680,026
Part D patients729
Dr. Stephan's Part D claims by kind of drug, 2024
- Generic5,028 claims90%
- Brand-name556 claims10%
Dr. Stephan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Stephan's Part D claims, 2024
- Antibiotics0%21 of 5,584 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5,2662024: 5,3462%
Drugs named by CMS: 54 in 2024, 52 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. William Joseph Stephan takes part in Medicare
Dr. Stephan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Coronary angioplasty and stenting: 1 to 10 procedures (CMS shows small counts as a range)
Leg revascularization (restoring blood flow): 1 to 10 procedures (CMS shows small counts as a range)
Pacemaker insertion or repair: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. William Joseph Stephan has 1 publication on record
Dmand AI links 1 paper to Dr. Stephan in 2011. Dr. Stephan's most frequent co-authors are Apoor Suresh Gami, MD, Joseph Clarence Marek, MD and Frank J. Zimmerman.
Papers1
Dr. Stephan's most frequent co-authors
- Apoor Suresh Gami, MD1 shared paper
- Joseph Clarence Marek, MD1 shared paper
- Frank J. Zimmerman1 shared paper
Recent publications by Dr. Stephan
See who Dr. Stephan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Stephan works with, so you can find a warm path to the right interventional cardiologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William Joseph Stephan has worked on 1 clinical trial
Dmand AI links Dr. Stephan to 1 clinical trial. 1 is still active or recruiting. Conditions studied include Mitral Valve Insufficiency and Heart Valve Diseases.
Conditions in Dr. Stephan's trials
- Mitral Valve Insufficiency
- Heart Valve Diseases
Investigators on the most trials with Dr. Stephan
- Mudassar Ahmed, MBBS1 shared trial
- Mustafa I. Ahmed, MD1 shared trial
- David Gerard Aliabadi, MD1 shared trial
Recent clinical trials with Dr. Stephan
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. William Joseph Stephan received $12,421 in industry payments from 2016 to 2025
CMS Open Payments shows 129 general payments to Dr. Stephan from 17 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 62% of the total. Edwards Lifesciences Corporation paid the most, $4,003.
General payments to Dr. Stephan by program year, 2016 to 2025
General payments to Dr. Stephan by kind, 2016 to 2025
$12.4Kin total
- Travel and lodging$7,71462%
- Food and beverage$4,48936%
- Entertainment$1291%
- Grants$891%
Companies that paid Dr. Stephan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Joseph Stephan graduated from Tufts University School of Medicine
Dr. Stephan graduated from Tufts University School of Medicine in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Joseph Stephan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Joseph Stephan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William Joseph Stephan's NPI number?
Dr. William Joseph Stephan's NPI number is 1851344931. It was assigned on May 18, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William Joseph Stephan?
Dr. William Joseph Stephan is an interventional cardiologist in Naperville, Illinois. The primary specialty in the NPI Registry is Interventional Cardiology Physician (taxonomy code 207RI0011X).
Where does Dr. William Joseph Stephan practice?
Dr. Stephan practices at 801 South Washington, Naperville, IL 60540. Dr. Stephan's primary practice is Edward Hospital in Naperville, Illinois, part of Endeavor Health. Dmand AI also links Dr. Stephan to 2 hospitals, 4 group practices and clinics and 3 medical groups.
What is Dr. William Joseph Stephan's office phone number?
The practice phone on file for Dr. Stephan is (630) 527-3000.
What is Dr. William Joseph Stephan's medical license number?
Dr. Stephan holds Illinois license 036.090607.
Which hospitals is Dr. William Joseph Stephan affiliated with?
Dr. Stephan practices at Edward Hospital in Naperville, Illinois. Dr. Stephan is also affiliated with Northwestern Medicine Central DuPage Hospital. Dmand AI links Dr. Stephan to 2 more hospitals.
What medical group is Dr. William Joseph Stephan part of?
Dr. Stephan is linked to Edward Hospital. Dmand AI links Dr. Stephan to 3 more medical groups.
Does Dr. William Joseph Stephan accept Medicare?
Yes. CMS data shows Dr. Stephan billed Medicare for 6,205 services in 2024, and Dr. Stephan accepts Medicare assignment.
How many Medicare patients does Dr. William Joseph Stephan see?
CMS counts 1,763 Medicare patients who saw Dr. Stephan in 2024, with an average age of 76.
What services does Dr. William Joseph Stephan bill to Medicare?
In 2024, Dr. Stephan's most billed Medicare services were medicare service (G2211), medical supplies or transport (A9555) and office visit, established patient (99214).
Show 6 more questionsShow fewer questions
Where did Dr. William Joseph Stephan go to medical school?
Dr. Stephan graduated from Tufts University School of Medicine in 1987.
What drugs does Dr. William Joseph Stephan prescribe most?
In 2024 Medicare Part D data, Dr. Stephan's most prescribed drugs by claims were Metoprolol Succinate, Atorvastatin Calcium and Rosuvastatin Calcium.
Has Dr. William Joseph Stephan received payments from drug or device companies?
CMS Open Payments shows $12,421 in general payments to Dr. Stephan from 17 companies from 2016 to 2025. The largest total came from Edwards Lifesciences Corporation.
How long has Dr. William Joseph Stephan been practicing?
Dr. Stephan graduated from medical school in 1987, 39 years ago.
Does Dr. William Joseph Stephan do research?
Dmand AI links 1 publication to Dr. Stephan. Dr. Stephan has worked on 1 clinical trial.
Who does Dr. William Joseph Stephan publish with?
Dr. Stephan's most frequent co-authors are Apoor Suresh Gami, MD (1 shared paper), Joseph Clarence Marek, MD (1 shared paper) and Frank J. Zimmerman (1 shared paper).
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