NPPES file of Aug 9, 2026

Jennifer Lee Kassir, M.D.

Internal Medicine Physician · Lisle, IL

Jennifer Lee Kassir, M.D. is an internal medicine physician with a practice address in Lisle, Illinois, and NPI 1528214715, issued on Aug 7, 2008. Check the license (Illinois 036.120590, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1528214715
Name
Jennifer Lee Kassir
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
036.120590 IL
036120590 IL
Self-reported in NPPES; status is on the state search
Practice location
430 Warrenville RD, Lisle, IL 60532
Phone
(630) 432-6180
Enumerated
Aug 7, 2008
Record last updated
Jun 15, 2022
Fax
(630) 432-6181
Medicaid ID
036120590 IL
Medicare enrollment
Enrolled (PECOS I20090212000201); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →

Also registered at 430 Warrenville RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jessica Amini PanahNurse Practitioner1720760705
  2. Katherine Baker, MDRadiation Oncology Physician1558362632
  3. Suchitra Bhakta, MDEndocrinology, Diabetes & Metabolism Physician1912988247
  4. Kristiana Burlini, DPTPhysical Therapist1720644966
  5. Eric Clymer, DOEmergency Medicine Physician1053400952
  6. Sheila Erasmus, NP-CNurse Practitioner1588324883

Verify Jennifer Lee Kassir in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036.120590    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

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28% more Medicare Part D claims than the average internal medicine physician in 2024

4,080 Medicare Part D claims for 497 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. 13 claims were for opioids.

  1. Jennifer Kassir4,080
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium397 claims
  2. Losartan Potassium279 claims
  3. Levothyroxine Sodium271 claims
  4. Rosuvastatin Calcium215 claims
  5. Amlodipine Besylate211 claims
  6. Metoprolol Succinate157 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.

Bills Medicare through one group practice

  1. Dupage Medical Group LtdLisle, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Jennifer Lee Kassir among 7,238 internal medicine physician records in Illinois

Jennifer Lee Kassir, M.D. 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 2008, is newer than 45% of them.

  • NPI issued2008 · 45% of these records are older, 51% newer
  • In a Medicare fileYes · 73% of these records are
  • In the CMS Doctors and Clinicians fileYes · 50% of these records are
  • Graduated2005 · median 2003 among the 3,580 with a school on file
  • Record last updated2022 · 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).

16 internal medicine physician records list a practice address in Lisle

They are 16 of the 610 NPPES records with a practice address in Lisle, and 7,238 internal medicine physician records in Illinois.

All 7,238 in Illinois → Every provider in Lisle → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Wa'El Abdo, M.D.Lisle, IL 605321740284074
  2. Alin Abraham, M.D.Lisle, IL 605321316101181
  3. Latha Arla, DOLisle, IL 605321578548921
  4. Dennis Asensio, M.D.Lisle, IL 605321891770624
  5. Christina Bratis, M.D.Lisle, IL 605321750593182
  6. Jean Houlihan, MDWarrenville, IL 605321952398885
  7. Zvezdana Ilic Bogojevic, M.D.Lisle, IL 605321104159896
  8. Nina Khazen, MDLisle, IL 605321861486722

Common questions

What is Jennifer Lee Kassir, M.D.'s NPI number?

Jennifer Lee Kassir, M.D.'s National Provider Identifier (NPI) is 1528214715, issued on Aug 7, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Jennifer Lee Kassir, M.D. located?

The NPPES record lists a practice address at 430 Warrenville RD, Lisle, IL, 60532. Phone: (630) 432-6180. Providers update this record themselves, so call before visiting.

How can I verify Jennifer Lee Kassir, M.D.'s license?

NPPES lists Illinois license number 036.120590, 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 Jennifer Lee Kassir, M.D. prescribe under Medicare Part D?

In 2024, Jennifer Lee Kassir, M.D. had 4,080 Medicare Part D claims for 497 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.