Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARGARITE DELORIS MATOSSIAN
NPI 1306427646
Internal Medicine - Medical Oncology in Chicago, IL

Q: What is Margarite Matossian's NPI number?

The NPI number for Margarite Matossian is 1306427646. It was assigned to this individual provider in the NPPES registry on April 19, 2021.

Q: What is Margarite Matossian's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Active since April 19, 2021PECOS Enrolled

5841 S MARYLAND AVE, CHICAGO, IL 60637(773) 702-1000 Get Directions Write a Review

NPPES record last updated: June 22, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jun 28, 2021, Apr 19, 2021 (2 updates tracked since 2021).

On this page

About Margarite Deloris Matossian NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARGARITE DELORIS MATOSSIAN (NPI 1306427646) is an individual medical oncology provider in Chicago, Illinois, licensed in Illinois (036.169015) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1306427646

Entity TypeIndividualFemale

Primary Taxonomy207RX0202X

Provider Legal NameMARGARITE DELORIS MATOSSIAN

Location Address5841 S MARYLAND AVEChicago, IL 60637-1443

Mailing Address150 Harvester Dr Ste 300Burr Ridge, IL 60527-5965 · (773) 702-1150

Phone(773) 702-1000

Sole ProprietorNo

Enumeration DateApril 19, 2021

Last NPPES UpdateJune 22, 20262 updates tracked since enumeration

NPPES CertifiedJune 22, 2026

✔ NPI 1306427646 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RX0202X

License✔ Licensed in IL · 036.169015

Definition

An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

Also ListedInternal MedicineTaxonomy 207R00000X · License 125.077763 (IL)

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

5841 S MARYLAND AVE, Chicago, IL 60637

Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Margarite Deloris Matossian is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60637 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$183.39 typical visit price

range $60.08 – $183.39

Typical copayment $45.84 (range $15.02 – $45.84)

Most-billed visit code 99205

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. DON MARTINEZ M.D.

Radiology (Diagnostic Radiology)