Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Steven Russo, MD, PHD

Nephrology Physician in Naples, FL · enumerated 2005.

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

National Provider Identifier

1316934326

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Registry record

Entity type Individual (Type 1)

Name Mark Steven Russo

Credential MD, PHD

Sex Male

Practice address 878 109th Ave N, Naples, FL, 34108

Phone (239) 513-1002

Fax (239) 513-1915

Enumeration date Oct 4, 2005

Last updated in NPPES Sep 11, 2013

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 83306 (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
13594	Other	FL	BLUE CROSS BLUE SHIELD
263246200	Medicaid	FL	-

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 Mark Russo?

Mark Russo is registered in NPPES with the primary taxonomy of Nephrology 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 2013-09-11.