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DR. AHMAD MARWAN NASSAR MD
NPI 1861988222
Internal Medicine - Hematology & Oncology in Chicago, IL

Active since July 09, 2018PECOS EnrolledAccepts Medicare Assignment
840 S WOOD ST STE 820-E, CHICAGO, IL 60612(312) 996-9424(312) 413-4131 Get Directions Write a Review

NPPES record last updated: May 20, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: May 20, 2025, Jul 9, 2018 (2 updates tracked since 2018).

About Dr. Ahmad Marwan Nassar Md NPPES

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

DR. AHMAD MARWAN NASSAR MD (NPI 1861988222) is an individual hematology & oncology provider in Chicago, Illinois, licensed in Georgia (104596) and active in the NPI registry since July 2018. He is enrolled in Medicare PECOS, is affiliated with Emory University Hospital Midtown, and is a graduate of Other (2015).

NPPES Registry Identity

NPI1861988222
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameDR. AHMAD MARWAN NASSARCredential: MD
Location Address840 S WOOD ST STE 820-EChicago, IL 60612-4325
Mailing Address840 S Wood St Ste 820-eChicago, IL 60612-4325 · (312) 996-9424 · Fax (312) 413-4131
Phone(312) 996-9424
Fax(312) 413-4131
Sole ProprietorYes
Medical School CMSOtherGraduated 2015
Enumeration DateJuly 9, 2018
Last NPPES UpdateMay 20, 20252 updates tracked since enumeration
NPPES CertifiedMay 20, 2025
✔ NPI 1861988222 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License✔ Licensed in GA · 104596
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
840 S WOOD ST STE 820-E, Chicago, IL 60612
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Ahmad Marwan Nassar Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1153829924
PECOS Enrollment IDI20250811002746
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.

Medicare Billing Reassignments

2

Medicare enrollment records show Ahmad Nassar reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Emory Clinic Inc
586 mi
Internal Medicine
1365 CLIFTON RD NE
Atlanta, GA 30322
  • Reassigned Medicare billing, Georgia enrollment
  • 4,840 clinicians in this Medicare group
NPI 1396798229 (404) 778-2144
Emory Medical Care Foundation Inc
588 mi
Internal Medicine
80 JESSE HILL JR DRIVE, EMCF
Atlanta, GA 30303
  • Reassigned Medicare billing, Georgia enrollment
  • 2,681 clinicians in this Medicare group
NPI 1063452381 (404) 778-7717

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Emory University Hospital Midtown

Acute Care Hospitals · Atlanta, GA
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number110078
Location550 Peachtree Street, NEAtlanta, GA 30308 · Fulton County
Emergency services Birthing friendly

Grady Memorial Hospital

Acute Care Hospitals · Atlanta, GA
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number110079
Location80 Jesse Hill, Jr Drive SEAtlanta, GA 30303 · Fulton County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 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

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

ANA-MARIA MARIA AVILA-RODRIGUEZ M.D.
Student in an Organized Health Care Education/Training Program
840 S WOOD ST STE 820-E
CHICAGO, IL 60612
Cook County (312) 996-9424

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ahmad Nassar's NPI number?

The NPI number for Ahmad Nassar is 1861988222. It was assigned to this individual provider in the NPPES registry on July 9, 2018.

Where is Ahmad Nassar located?

Ahmad Nassar practices at 840 S Wood St Ste 820-E, Chicago, IL 60612. The listed phone number is (312) 996-9424.

What is Ahmad Nassar's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Ahmad Nassar enrolled in Medicare?

Yes. Ahmad Nassar is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Ahmad Nassar's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ahmad Nassar reassigns Medicare benefits to 2 organizations: The Emory Clinic Inc (Atlanta, GA) and Emory Medical Care Foundation Inc (Atlanta, GA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ahmad Nassar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ahmad Nassar accept?

Health plans from Oscar Health list Ahmad Nassar as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Ahmad Nassar affiliated with any hospitals?

According to CMS data, Ahmad Nassar is affiliated with Emory University Hospital Midtown and Grady Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Ahmad Nassar was last updated on May 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.