Margarite Deloris Matossian
Medical Oncology Physician · Chicago, IL
Margarite Deloris Matossian is a medical oncology physician with a practice address in Chicago, Illinois, and NPI 1306427646, issued on Apr 19, 2021. Check the license (Illinois 036.169015, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Margarite Deloris Matossian
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License numbers
- 036.169015 IL
125.077763 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5841 S Maryland Ave, Chicago, IL 60637
- Phone
- (773) 702-1000
- Enumerated
- Apr 19, 2021
- Record last updated
- Jun 22, 2026
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 182 in Illinois → Look up another NPI →
Also registered at 5841 S Maryland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ma. Theresa Abaring, CRNACertified Registered Nurse Anesthetist1962647586
- Rouzbeh AbbasgholizadehRetina Specialist (Ophthalmology) Physician1881510030
- Jehad Abdalla, MDSleep Medicine (Internal Medicine) Physician1053898684
- Sara Abdelaziz, MDEndocrinology, Diabetes & Metabolism Physician1598258089
- Noor Abdelrahman, PA-CPhysician Assistant1851012413
- Unknown Abdul Hanan, MDBlood Banking & Transfusion Medicine Physician1750022240
Verify Margarite Deloris Matossian 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 036.169015Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average medical oncology physician in 2024
67 Medicare Part D claims for 28 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% 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.
Industry payments in 2024: $2,095.00
2 payments; by number, the most common kind was food and beverage; the largest payer was TerSera Therapeutics LLC. The 3,343 providers of this specialty with any payment received $11,773.47 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.
Margarite Deloris Matossian among 182 medical oncology physician records in Illinois
Margarite Deloris Matossian 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 2021, is newer than 97% of them.
- NPI issued2021 · 97% of these records are older, 2% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 73% of these records are
- Record last updated2026 · 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
- Manik Amin, MDChicago, IL 606371265689889
- Christine Bestvina, M.D.Chicago, IL 606371720354137
- Janet Chin, MDChicago, IL 606371205862653
- Kenneth CohenChicago, IL 606371881787067
- Abiola Ibraheem, M.B.CHBChicago, IL 606371013273614
- Andrzej JakubowiakChicago, IL 606371134205081
- Hedy KindlerChicago, IL 606371851453302
- Alexander PearsonChicago, IL 606371134448665
Common questions
What is Margarite Deloris Matossian's NPI number?
Margarite Deloris Matossian's National Provider Identifier (NPI) is 1306427646, issued on Apr 19, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Margarite Deloris Matossian located?
The NPPES record lists a practice address at 5841 S Maryland Ave, Chicago, IL, 60637. Phone: (773) 702-1000. Providers update this record themselves, so call before visiting.
How can I verify Margarite Deloris Matossian's license?
NPPES lists Illinois license number 036.169015, 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 Margarite Deloris Matossian prescribe under Medicare Part D?
In 2024, Margarite Deloris Matossian had 67 Medicare Part D claims for 28 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.
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.