Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. David K Ornstein, MD

Urology Physician in Naples, FL · enumerated 2006 · practices at 21st Century Oncology LLC.

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

National Provider Identifier

1285714428

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Registry record

Entity type Individual (Type 1)

Name Dr. David K Ornstein

Credential MD

Sex Male

Practice address 733 4th Ave N, Naples, FL, 34102

Phone (239) 403-9503

Fax (239) 403-9756

Enumeration date Oct 16, 2006

Last updated in NPPES Apr 20, 2016

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License N1406 (TX) Secondary

208800000X Urology Physician Allopathic & Osteopathic Physicians · License ME104879 (FL) 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
001253400	Medicaid	FL	-
6111651	Other	FL	CIGNA
1193418	Other	FL	WELLCARE
613360149	Other	FL	DEPARTMENT OF ENERGY
344443	Other	FL	AVMED

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 K Ornstein?

David K Ornstein 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.

Other providers at this practice address

Browse all →

21st Century Oncology LLC Urology Physician · Naples, FL NPI 1821228685 Daniel Schloegel Physician Assistant · Naples, FL NPI 1184189250

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-04-20.