DR. IRFAN HASAN SIDDIQUI MD
NPI 1023404795
Internal Medicine in Oak Lawn, IL
About Dr. Irfan Hasan Siddiqui Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. IRFAN HASAN SIDDIQUI MD (NPI 1023404795) is an individual internal medicine provider in Oak Lawn, Illinois, licensed in Illinois (036.146952) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Advocate Trinity Hospital, and maintains a secondary practice location in Oak Lawn.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Irfan Hasan Siddiqui 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.
Medicare Billing Reassignment
Medicare enrollment records show Irfan Siddiqui reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 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 11
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Advocate Trinity 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.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
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 Irfan Siddiqui's NPI number?
The NPI number for Irfan Siddiqui is 1023404795. It was assigned to this individual provider in the NPPES registry on April 9, 2015.
Where is Irfan Siddiqui located?
Irfan Siddiqui practices at 4220 W 95th St Ste 200, Oak Lawn, IL 60453. The listed phone number is (312) 731-6329.
What is Irfan Siddiqui's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Irfan Siddiqui enrolled in Medicare?
Yes. Irfan Siddiqui 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 organization bills Medicare for Irfan Siddiqui's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Irfan Siddiqui reassigns Medicare benefits to Advocate Health & Hospitals Corporation (Oak Lawn, IL). The 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 Irfan Siddiqui's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Irfan Siddiqui affiliated with any hospitals?
According to CMS data, Irfan Siddiqui is affiliated with Advocate Trinity Hospital and Advocate Christ Hospital & Medical Center.
When was this NPI record last updated?
The NPPES record for Irfan Siddiqui was last updated on December 16, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.
# Dr. Irfan Hasan Siddiqui, MD · NPI 1023404795
Internal Medicine physician in Oak Lawn, Illinois. Individual provider, active in the CMS NPPES registry since April 9, 2015.
## Identity
- **NPI:** 1023404795 (Entity type: Individual)
- **Enumerated:** April 9, 2015
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 036.146952 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 4220 W 95TH ST STE 200, Oak Lawn, IL 60453-3072
- **Phone:** (312) 731-6329
## 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:** Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** December 16, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1023404795) · Data from the CMS NPPES public registry.