NPPES file of Aug 9, 2026

Eugene R. Ahn, M.D.

Medical Oncology Physician · Chicago, IL

Eugene R. Ahn, M.D. is a medical oncology physician with a practice address in Chicago, Illinois, and NPI 1093911307, issued on Jun 23, 2007. Check the license (Illinois 036.136519, 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
1093911307
Name
Eugene R. Ahn
Credential
M.D.
Primary taxonomy
Medical Oncology Physician 207RX0202X
License numbers
036.136519 IL
ME92099 FL
Self-reported in NPPES; status is on the state search
Practice location
2361 Paysphere Cir, Chicago, IL 60674
Phone
(847) 746-4358
Enumerated
Jun 23, 2007
Record last updated
Oct 26, 2016 (not updated in 10 years: call before relying on the address or phone)
Fax
(847) 731-1017
Medicare enrollment
Enrolled (PECOS I20141226000153); accepts Medicare assignment
Medical or professional school
University Of Miami, Lm Miller School Of Medicine, 1997
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 medical oncology physician records → All 182 in Illinois → Look up another NPI →

Also registered at 2361 Paysphere Cir

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

  1. Irina AleynikovaOther Specialist/Technologist1407833023
  2. Aric Blom, PA-CPhysician Assistant1114905411
  3. Ruth Diamond, FNP-BCFamily Nurse Practitioner1013255975
  4. Yiping Fu, M.D.Pulmonary Disease Physician1043205107
  5. Joel Granick, MDSpecialist1700864378
  6. Solomon Katta, M.D.Family Medicine Physician1265668750

Verify Eugene R. Ahn 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 036.136519    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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74% fewer Medicare Part D claims than the average medical oncology physician in 2024

185 Medicare Part D claims for 60 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.

  1. Eugene Ahn185
  2. Specialty average703

Most prescribed

  1. Tamoxifen Citrate42 claims
  2. Letrozole29 claims
  3. Anastrozole23 claims
  4. Ibrance13 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.

One hospital affiliation

  1. Loyola University Medical CenterMaywood, IL · Acute Care Hospitals2 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Eugene R. Ahn among 182 medical oncology physician records in Illinois

Eugene R. Ahn, M.D. is one of 182 medical oncology physician records with a practice address in Illinois. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 57% of them.

  • NPI issued2007 · 57% of these records are older, 37% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 73% of these records are
  • Graduated1997 · median 2000 among the 132 with a school on file
  • Record last updated2016 · 52% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Medical Oncology Physician providers in Illinois

There are 182 medical oncology physician records in Illinois.

All 182 in Illinois → Every provider in Chicago → Medical Oncology Physician nationwide →

The 8 medical oncology physician records with the nearest ZIP codes

  1. Dennis Citrin, M.D.Chicago, IL 606741518944800
  2. Atulkumar Dave, MDChicago, IL 606741295701738
  3. Rakhshanda Neelam, M.D.Chicago, IL 606741245217611
  4. Mebea Aklilu, MDChicago, IL 606571376527739
  5. Denise Levitan, MDChicago, IL 606571871572784
  6. Mohammad Atiq, M.D.Chicago, IL 606371851719967
  7. Vivek Behera, M.D., PH. D.Chicago, IL 606371063037208
  8. Robert Cameron, MD, PHDChicago, IL 606371144840166

Common questions

What is Eugene R. Ahn, M.D.'s NPI number?

Eugene R. Ahn, M.D.'s National Provider Identifier (NPI) is 1093911307, issued on Jun 23, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Eugene R. Ahn, M.D. located?

The NPPES record lists a practice address at 2361 Paysphere Cir, Chicago, IL, 60674. Phone: (847) 746-4358. Providers update this record themselves, so call before visiting.

How can I verify Eugene R. Ahn, M.D.'s license?

NPPES lists Illinois license number 036.136519, 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 Eugene R. Ahn, M.D. prescribe under Medicare Part D?

In 2024, Eugene R. Ahn, M.D. had 185 Medicare Part D claims for 60 beneficiaries; the average among medical oncology physician prescribers was 703. 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.