Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Muhammad Najjar, M.D.

Sleep Medicine (Psychiatry & Neurology) Physician in Northbrook, IL · enumerated 2006.

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

National Provider Identifier

1265489140

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Muhammad Najjar

Credential M.D.

Sex Male

Practice address 1535 Lake Cook Rd Ste 206, Northbrook, IL, 60062

Phone (847) 674-3600

Fax (847) 674-3639

Enumeration date May 27, 2006

Last updated in NPPES Jan 22, 2018

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 336062062 (IL) Secondary

2084S0012X Sleep Medicine (Psychiatry & Neurology) Physician Allopathic & Osteopathic Physicians · License 01067650 (IN) 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
200932940C	Medicaid	IN	-
201046350	Medicaid	IN	-

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 specialty is Muhammad Najjar?

Muhammad Najjar is registered in NPPES with the primary taxonomy of Sleep Medicine (Psychiatry & Neurology) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Northshore Sleep Medicine, S.C. Sleep Disorder Diagnostic Clinic/Center · Northbrook, IL NPI 1053453167 Lisa Levick-Doane Foot & Ankle Surgery Podiatrist · Northbrook, IL NPI 1730491465 Lisa Levick, Dpm, P.C. Foot & Ankle Surgery Podiatrist · Northbrook, IL NPI 1821834961

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-22.