Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Horowitz, MD

Urology Physician in Flushing, NY · enumerated 2005.

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

National Provider Identifier

1881689008

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Registry record

Entity type Individual (Type 1)

Name Mark Horowitz

Credential MD

Sex Male

Practice address 5645 Main St, W-Ll300, Flushing, NY, 11355

Phone (718) 445-0220

Fax (718) 939-1167

Enumeration date Sep 14, 2005

Last updated in NPPES Jul 30, 2015

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 172766 (NY) Primary

2088P0231X Pediatric Urology Physician Allopathic & Osteopathic Physicians · License 172766 (NY) Secondary

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
01562707	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.

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Frequently asked questions

What specialty is Mark Horowitz?

Mark Horowitz is registered in NPPES with the primary taxonomy of Urology 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-30.