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

Dr. Mitchell Kleinberg, M.D.

Pediatric Adolescent Medicine Physician in Holbrook, NY · enumerated 2006.

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

National Provider Identifier

1447367537

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Registry record

Entity type Individual (Type 1)

Name Dr. Mitchell Kleinberg

Credential M.D.

Sex Male

Practice address Holbrook, NY, 11741

Phone (631) 558-4442

Fax (631) 471-3039

Enumeration date Aug 24, 2006

Last updated in NPPES Apr 10, 2012

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

Taxonomy & licenses

2080A0000X Pediatric Adolescent Medicine Physician Allopathic & Osteopathic Physicians · License 154133 (NY) 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
00765857	Medicaid	NY	-

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 Mitchell Kleinberg practice?

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

What is the NPI number for Mitchell Kleinberg?

The National Provider Identifier (NPI) for Mitchell Kleinberg is 1447367537, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-10.