Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Irfan Hasan Siddiqui, MD

Internal Medicine Physician in Oak Lawn, IL · enumerated 2015.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1023404795

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Registry record

Entity type Individual (Type 1)

Name Dr. Irfan Hasan Siddiqui

Credential MD

Sex Male

Practice address 4220 W 95th St Ste 200, Oak Lawn, IL, 60453

Phone (312) 731-6329

Enumeration date Apr 9, 2015

Last updated in NPPES Dec 16, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036.146952 (IL) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Irfan Siddiqui practice?

The practice location on file with NPPES is in Oak Lawn, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Irfan Siddiqui?

The National Provider Identifier (NPI) for Irfan Siddiqui is 1023404795, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-16.