Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Arjun Natarajan, MD

Medical Oncology Physician in Aurora, IL · enumerated 2016.

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

National Provider Identifier

1144682642

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Registry record

Entity type Individual (Type 1)

Name Dr. Arjun Natarajan

Credential MD

Sex Male

Practice address 1221 N Highland Ave, Aurora, IL, 60506

Phone (630) 554-3456

Fax (630) 551-2970

Enumeration date Mar 23, 2016

Last updated in NPPES Aug 23, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 2019024566 (MO) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 2019024566 (MO) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 036.170026 (IL) Primary

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

Other identifiers

Identifier	Type	State	Issuer
200073800	Medicaid	MO	-

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

What is the NPI number for Arjun Natarajan?

The National Provider Identifier (NPI) for Arjun Natarajan is 1144682642, a Type 1 (individual) record in the CMS NPPES registry.

Where does Arjun Natarajan practice?

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

Other providers at this practice address

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James Studlo Diagnostic Radiology Physician · Aurora, IL NPI 1407857105 Katherine Kouvelis Surgery Physician · Aurora, IL NPI 1861493165 Thomas White Orthopaedic Surgery Physician · Aurora, IL NPI 1104813435 John Tauscher Diagnostic Radiology Physician · Aurora, IL NPI 1902894231 Jill Austin Podiatrist · Aurora, IL NPI 1730164047 Rachel Bullar Physical Therapist · Aurora, IL NPI 1023095650 Shruti Parekh Physician Assistant · Aurora, IL NPI 1598745275 Steven Rabin Orthopaedic Surgery Physician · Aurora, IL NPI 1487628525

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-23.