YOUSEF NASSAR
NPI 1750730677
Internal Medicine - Gastroenterology in Oak Lawn, IL
About Yousef Nassar NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
YOUSEF NASSAR (NPI 1750730677) is an individual gastroenterology provider in Oak Lawn, Illinois, licensed in Illinois (036158704) and active in the NPI registry since June 2016. He is enrolled in Medicare PECOS, is affiliated with Mt Sinai Hospital Medical Center, and maintains a secondary practice location in Albany.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Group Practice 1
Accepted 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
Yousef Nassar 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.
Medicare Billing Reassignments
2Medicare enrollment records show Yousef Nassar reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 clinicians in this Medicare group
Chicago, IL 60629
- Reassigned Medicare billing, Illinois enrollment
- 646 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mt Sinai Hospital Medical Center
Acute Care Hospitals · Chicago, ILHoly Cross Hospital
Acute Care Hospitals · Chicago, ILAdvocate Christ Hospital & Medical Center
Acute Care Hospitals · Oak Lawn, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60453 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OAK LAWN, IL 60453
OAK LAWN, IL 60453
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 Yousef Nassar's NPI number?
The NPI number for Yousef Nassar is 1750730677. It was assigned to this individual provider in the NPPES registry on June 10, 2016.
Where is Yousef Nassar located?
Yousef Nassar practices at 4400 W 95th St Ste 310, Oak Lawn, IL 60453. The listed phone number is (708) 684-9230.
What is Yousef Nassar's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Yousef Nassar enrolled in Medicare?
Yes. Yousef 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 Yousef Nassar's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Yousef Nassar reassigns Medicare benefits to 2 organizations: Advocate Health & Hospitals Corporation (Oak Lawn, IL) and Mount Sinai Community Foundation (Chicago, IL). 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 Yousef Nassar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Yousef Nassar accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Yousef 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 Yousef Nassar affiliated with any hospitals?
According to CMS data, Yousef Nassar is affiliated with Mt Sinai Hospital Medical Center, Holy Cross Hospital and Advocate Christ Hospital & Medical Center.
When was this NPI record last updated?
The NPPES record for Yousef Nassar was last updated on July 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Yousef Nassar · NPI 1750730677
Gastroenterology physician in Oak Lawn, Illinois. Individual provider, active in the CMS NPPES registry since June 10, 2016.
## Identity
- **NPI:** 1750730677 (Entity type: Individual)
- **Enumerated:** June 10, 2016
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 036158704 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 4400 W 95TH ST STE 310, Oak Lawn, IL 60453-2660
- **Phone:** (708) 684-9230
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL); Mount Sinai Community Foundation (NPI 1578972188, Chicago, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** July 24, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1750730677) · Data from the CMS NPPES public registry.