Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Leslie Ann Masood, M.D.

Neurology Physician in Downers Grove, IL · enumerated 2007 · practices at Advanced Headache and Neurocare Clinic.

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

National Provider Identifier

1396951240

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Registry record

Entity type Individual (Type 1)

Name Dr. Leslie Ann Masood

Credential M.D.

Sex Female

Practice address Downers Grove, IL, 60515

Phone (630) 408-6992

Enumeration date May 15, 2007

Last updated in NPPES Feb 16, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 036115294 (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
P00444353/CK6882	Other	IL	RAILROAD MEDICARE
01633122	Other	IL	BCBS PROVIDER NUMBER
036115294	Other	IL	STATE LIC NUMBER
4673170001	Other	IL	DMERC GROUP

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 Leslie Masood?

The National Provider Identifier (NPI) for Leslie Masood is 1396951240, a Type 1 (individual) record in the CMS NPPES registry.

Where does Leslie Masood practice?

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

Other providers at this practice address

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Advanced Headache and Neurocare Clinic Medical Specialty Clinic/Center · Downers Grove, IL NPI 1861865867

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-16.