Ahmad Marwan Nassar, MD
Hematology & Oncology Physician · Chicago, IL
Ahmad Marwan Nassar, MD is a hematology & oncology physician with a practice address in Chicago, Illinois, and NPI 1861988222, issued on Jul 9, 2018. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ahmad Marwan Nassar
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 104596 GA
Self-reported in NPPES; status is on the state search - Practice location
- 840 S Wood St Ste 820-E, Chicago, IL 60612
- Phone
- (312) 996-9424
- Enumerated
- Jul 9, 2018
- Record last updated
- May 20, 2025
- Fax
- (312) 413-4131
- Medicare enrollment
- Enrolled (PECOS I20250811002746); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 666 in Illinois → Look up another NPI →
Also registered at 840 S Wood St Ste 820-E
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ana Maria Avila Rodriguez, M.D.Hematology & Oncology Physician1326545724
Verify Ahmad Marwan Nassar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
49 Medicare Part D claims for 21 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of 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 2 group practices
- Emory Medical Care Foundation IncAtlanta, GA
- The Emory Clinic IncAtlanta, GA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ahmad Marwan Nassar among 666 hematology & oncology physician records in Illinois
Ahmad Marwan Nassar, MD is one of 666 hematology & oncology physician records with a practice address in Illinois. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 83% of them.
- NPI issued2018 · 83% of these records are older, 13% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2015 · median 2003 among the 461 with a school on file
- Record last updated2025 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Illinois
There are 666 hematology & oncology physician records in Illinois.
All 666 in Illinois → Every provider in Chicago → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Piernicola Boccuni, M.D.Chicago, IL 606121851451926
- Lisa Boggio, MDChicago, IL 606121336116151
- Rosalind Catchatourian, MDChicago, IL 606121881602092
- Carmel Chou, M.D.Chicago, IL 606121316024086
- Lawrence FeldmanChicago, IL 606121871607051
- Victor Gordeuk, MDChicago, IL 606121033270046
- William Leslie, M.D.Chicago, IL 606121538129275
- Robert Molokie, M.D.Chicago, IL 606121114969136
Common questions
What is Ahmad Marwan Nassar, MD's NPI number?
Ahmad Marwan Nassar, MD's National Provider Identifier (NPI) is 1861988222, issued on Jul 9, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Ahmad Marwan Nassar, MD located?
The NPPES record lists a practice address at 840 S Wood St Ste 820-E, Chicago, IL, 60612. Phone: (312) 996-9424. Providers update this record themselves, so call before visiting.
How can I verify Ahmad Marwan Nassar, MD's license?
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 Ahmad Marwan Nassar, MD prescribe under Medicare Part D?
In 2024, Ahmad Marwan Nassar, MD had 49 Medicare Part D claims for 21 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.