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

Gregory V Hahn, MD

Pediatric Orthopaedic Surgery Physician in St Petersburg, FL · enumerated 2005.

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

National Provider Identifier

1396733341

Verified

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Registry record

Entity type Individual (Type 1)

Name Gregory V Hahn

Credential MD

Sex Male

Practice address St Petersburg, FL, 33701

Phone (727) 898-2663

Fax (727) 568-6836

Enumeration date Oct 12, 2005

Last updated in NPPES May 22, 2025

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

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License ME78419 (FL) Secondary

207XS0117X Orthopaedic Surgery of the Spine Physician Allopathic & Osteopathic Physicians · License ME78419 (FL) Secondary

207XP3100X Pediatric Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License ME78419 (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
256641900	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.

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Frequently asked questions

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.

What specialty is Gregory Hahn?

Gregory Hahn is registered in NPPES with the primary taxonomy of Pediatric Orthopaedic Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-05-22.