Dr. Mark W. Stolar, MD
- Medicare services, 2024
- 1,427
- Medicare patients, 2024
- 541
- Part D claims, 2024
- 10,224
- MIPS score, 2024
- 96
- Hospital affiliations
- 6
- Practice address
- 25 North Winfield Road, Winfield, IL 60190
- Practice phone
- Call (630) 682-1600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Stolar's professional email, personal email and mobile number
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Dr. Mark W. Stolar is an internist in Winfield, Illinois
Dr. Stolar practices at Northwestern Medicine Central DuPage Hospital in Winfield, Illinois, part of Northwestern Memorial HealthCare.
Dr. Stolar's NPI, 1396784591, was assigned on June 5, 2006. Dr. Stolar graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1979. Dr. Stolar holds Illinois license 036061561.
- NPI
- 1396784591NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507806312
- NPI enumeration date
- June 5, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (630) 682-1600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark W. Stolar practices at Northwestern Medicine Central DuPage Hospital in Winfield, Illinois
Dr. Stolar's primary practice is Northwestern Medicine Central DuPage Hospital, at 25 North Winfield Road, Winfield, IL 60190 in Du Page County. The practice phone is (630) 682-1600.
- Northwestern Medicine Central DuPage Hospital25 North Winfield Road, Winfield, IL 60190 · Du Page CountyPhone(630) 682-1600
Source: Dmand AI Affiliation Data
Dr. Mark W. Stolar is affiliated with 10 sites of care and 1 medical group
Dr. Stolar's primary practice is Northwestern Medicine Central DuPage Hospital in Winfield, Illinois, part of Northwestern Memorial HealthCare. Dr. Stolar is also affiliated with Northwestern Memorial Hospital. The medical group on file is Northwestern Medicine Regional Medical Group. Dmand AI also links Dr. Stolar to 4 more hospitals, 1 breast imaging center, 1 clinical lab, 1 group practice or clinic and 1 home health agency, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark W. Stolar's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Stolar practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Medicine Central DuPage Hospital | Available with a free account |
| +9 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark W. Stolar is one of 5,652 internists in Illinois
Internal medicine is Dr. Stolar's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Stolar is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Stolar
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark W. Stolar billed Medicare for 1,427 services in 2024
CMS data shows 1,427 Medicare services from Dr. Stolar across 17 procedure codes in 2024, for 541 Medicare patients. Medicare paid $110,917 for them. Every service was in an office.
Dr. Stolar's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 4892024: 55513%
- Office and hospital visits
- 2023: 8092024: 52735%
- Lab and pathology
- 2023: 1412024: 17423%
- Tests and treatments
- 2023: 2082024: 17118%
- Surgery
- 2023: 172024: 0100%
Dr. Stolar compared with the Illinois median for internists, 2024
- Dr. Stolar
- Illinois median
- Medicare services
- 1,427vs 5662.5 times
- Medicare patients
- 541vs 2082.6 times
- Part D claims
- 9,342vs 28432.9 times
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Stolar'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.
Need commercial claims for Dr. Stolar?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Stolar and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark W. Stolar treated 541 Medicare patients in 2024, average age 73
CMS counts 541 Medicare patients who saw Dr. Stolar in 2024. The largest group is 65 to 74, with 312 patients. 72% of them have high cholesterol, and 61% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.05, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Stolar's median patient age at 68, with 47% women.
Dr. Stolar's Medicare patients by age, 2024
Dr. Stolar's Medicare patients by sex, 2024
- Women26850%
- Men27350%
Chronic conditions among Dr. Stolar's Medicare patients, 2024
- High cholesterol72%
- High blood pressure61%
- Arthritis41%
- Diabetes34%
- Ischemic heart disease29%
- Mood disorders20%
- Anxiety19%
- Chronic kidney disease17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Stolar's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark W. Stolar wrote 10,224 Medicare Part D claims in 2024
In 2024, Dr. Stolar wrote 10,224 Medicare Part D claims for 874 patients. 79% of them were for generic drugs. CMS names the drug for 9,342 of them, across 175 drugs with 11 or more claims each, at $1,294,215 in total drug cost. In 2023, CMS named 7,912 claims across 153 drugs.
Dr. Stolar's Part D claims by kind of drug, 2024
- Generic8,125 claims79%
- Brand-name1,877 claims18%
- Other222 claims2%
Dr. Stolar'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. Stolar's Part D claims, 2024
- Opioids3%357 of 10,224 claims
- Antibiotics2%221 of 10,224 claims
- Antipsychotics, patients 65 and over0%21 of 10,224 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: 7,9122024: 9,34218%
Drugs named by CMS: 175 in 2024, 153 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
Dr. Mark W. Stolar scored 96 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 96 out of 100 for Dr. Stolar for performance year 2024, reported through an alternative payment model (APM). Dr. Stolar accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Stolar as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Stolar's MIPS scores, performance year 2024
- 96of 100Final score
- 88.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mark W. Stolar received $29,202 in industry payments from 2016 to 2021
CMS Open Payments shows 49 general payments to Dr. Stolar from 2 drug and device companies from 2016 to 2021. Speaker and faculty fees make up the largest share, 80% of the total. AstraZeneca Pharmaceuticals LP paid the most, $20,068.
General payments to Dr. Stolar by program year, 2016 to 2021
General payments to Dr. Stolar by kind, 2016 to 2021
- Speaker and faculty fees$23,37580%
- Travel and lodging$2,6409%
- Consulting fees$2,3508%
- Food and beverage$8253%
- Education$120%
Companies that paid Dr. Stolar the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark W. Stolar graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Dr. Stolar graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark W. Stolar'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (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. Mark W. Stolar
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. Mark W. Stolar's NPI number?
Dr. Mark W. Stolar's NPI number is 1396784591. It was assigned on June 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark W. Stolar?
Dr. Mark W. Stolar is an internist in Winfield, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark W. Stolar practice?
Dr. Stolar practices at 25 North Winfield Road, Winfield, IL 60190. Dr. Stolar's primary practice is Northwestern Medicine Central DuPage Hospital in Winfield, Illinois, part of Northwestern Memorial HealthCare. Dmand AI also links Dr. Stolar to 4 hospitals, 1 breast imaging center, 1 clinical lab, 1 group practice or clinic and 1 home health agency.
What is Dr. Mark W. Stolar's office phone number?
The practice phone on file for Dr. Stolar is (630) 682-1600.
What is Dr. Mark W. Stolar's medical license number?
Dr. Stolar holds Illinois license 036061561.
Which hospitals is Dr. Mark W. Stolar affiliated with?
Dr. Stolar practices at Northwestern Medicine Central DuPage Hospital in Winfield, Illinois. Dr. Stolar is also affiliated with Northwestern Memorial Hospital. Dmand AI links Dr. Stolar to 4 more hospitals.
What medical group is Dr. Mark W. Stolar part of?
Dr. Stolar is linked to Northwestern Medicine Regional Medical Group.
Does Dr. Mark W. Stolar accept Medicare?
Yes. CMS data shows Dr. Stolar billed Medicare for 1,427 services in 2024, and Dr. Stolar accepts Medicare assignment.
Does Dr. Mark W. Stolar offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Stolar as offering telehealth services.
What is Dr. Mark W. Stolar's MIPS score?
Dr. Stolar's MIPS final score for performance year 2024 is 96 out of 100, reported through an alternative payment model (APM).
Show 6 more questionsShow fewer questions
How many Medicare patients does Dr. Mark W. Stolar see?
CMS counts 541 Medicare patients who saw Dr. Stolar in 2024, with an average age of 73.
What services does Dr. Mark W. Stolar bill to Medicare?
In 2024, Dr. Stolar's most billed Medicare services were medicare service (G0439), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Mark W. Stolar go to medical school?
Dr. Stolar graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1979.
What drugs does Dr. Mark W. Stolar prescribe most?
In 2024 Medicare Part D data, Dr. Stolar's most prescribed drugs by claims were Levothyroxine Sodium, Atorvastatin Calcium and Rosuvastatin Calcium.
Has Dr. Mark W. Stolar received payments from drug or device companies?
CMS Open Payments shows $29,202 in general payments to Dr. Stolar from 2 companies from 2016 to 2021. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Mark W. Stolar been practicing?
Dr. Stolar graduated from medical school in 1979, 47 years ago.
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