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

Dr. Louis Marshall Najarian, MD

Child & Adolescent Psychiatry Physician in Manhasset, NY · enumerated 2008.

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

National Provider Identifier

1548429855

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Registry record

Entity type Individual (Type 1)

Name Dr. Louis Marshall Najarian

Credential MD

Sex Male

Practice address Manhasset, NY, 11030

Phone (516) 627-3980

Fax (516) 365-2219

Enumeration date Jun 3, 2008

Last updated in NPPES Jun 3, 2008

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

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 1117311 (NY) Secondary

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License 1117311 (NY) 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 Louis Najarian practice?

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

What is the NPI number for Louis Najarian?

The National Provider Identifier (NPI) for Louis Najarian is 1548429855, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-03.