Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. David Michael Horowitz, M.D.

Internal Medicine Physician in Smithtown, NY · enumerated 2006.

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

National Provider Identifier

1811901200

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Registry record

Entity type Individual (Type 1)

Name Dr. David Michael Horowitz

Credential M.D.

Sex Male

Practice address 2 Brooksite Drive, Suite 210, Smithtown, NY, 11787

Phone (631) 724-4048

Fax (631) 780-6899

Enumeration date Jul 28, 2006

Last updated in NPPES Feb 21, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 142369 (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
007735973	Medicaid	NY	-
00773597-3	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

What specialty is David Horowitz?

David Horowitz is registered in NPPES with the primary taxonomy of Internal Medicine 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-02-21.