Jeffrey Tomaszewski, MD
Internal Medicine Physician · Glen Ellyn, IL
Jeffrey Tomaszewski, MD is an internal medicine physician with a practice address in Glen Ellyn, Illinois, and NPI 1831150036, issued on Mar 29, 2006. Check the license (Illinois 036112627, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Jeffrey Tomaszewski
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036112627 IL
Self-reported in NPPES; status is on the state search - Practice location
- 430 Pennsylvania Ave, Glen Ellyn, IL 60137
- Phone
- (630) 469-9200
- Enumerated
- Mar 29, 2006
- Record last updated
- Jan 27, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 036112627 IL
- Medicare enrollment
- Enrolled (PECOS I20051014000357); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 2002
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 430 Pennsylvania Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jeffrey Tomaszewski 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 036112627Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
7,075 Medicare Part D claims for 717 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 84 claims were for opioids.
Most prescribed
- Atorvastatin Calcium602 claims
- Rosuvastatin Calcium529 claims
- Amlodipine Besylate509 claims
- Lisinopril367 claims
- Losartan Potassium360 claims
- Levothyroxine Sodium338 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: $95.29
5 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through one group practice
- Dupage Medical Group LtdSchaumburg, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jeffrey Tomaszewski among 7,238 internal medicine physician records in Illinois
Jeffrey Tomaszewski, MD is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2002 · median 2003 among the 3,580 with a school on file
- Record last updated2011 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
18 internal medicine physician records list a practice address in Glen Ellyn
They are 18 of the 684 NPPES records with a practice address in Glen Ellyn, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Glen Ellyn → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- John Baird, MDGlen Ellyn, IL 601371851555619
- Walter Briney, M.D.Glen Ellyn, IL 601371659365955
- Jonathan Delew, M.D.Glen Ellyn, IL 601371629060710
- Adelbert Duvel, MDGlen Ellyn, IL 601371275508772
- Stephen Gawne, MDGlen Ellyn, IL 601371497729537
- Rita Herzing, M.D.Glen Ellyn, IL 601371316103559
- Mary Kungl, M.D.Glen Ellyn, IL 601371437215076
- Thomas Marshall, M.D.Glen Ellyn, IL 601371043202054
Common questions
What is Jeffrey Tomaszewski, MD's NPI number?
Jeffrey Tomaszewski, MD's National Provider Identifier (NPI) is 1831150036, issued on Mar 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey Tomaszewski, MD located?
The NPPES record lists a practice address at 430 Pennsylvania Ave, Glen Ellyn, IL, 60137. Phone: (630) 469-9200. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey Tomaszewski, MD's license?
NPPES lists Illinois license number 036112627, 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 Jeffrey Tomaszewski, MD prescribe under Medicare Part D?
In 2024, Jeffrey Tomaszewski, MD had 7,075 Medicare Part D claims for 717 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.