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

Dr. Siobain Margaret Horan, M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in North Las Vegas, NV · enumerated 2007.

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

National Provider Identifier

1821200312

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Registry record

Entity type Individual (Type 1)

Name Dr. Siobain Margaret Horan

Credential M.D.

Sex Female

Practice address North Las Vegas, NV, 89086

Phone (702) 791-9000

Enumeration date May 4, 2007

Last updated in NPPES Jul 4, 2023

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

Taxonomy & licenses

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 107696 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 is the NPI number for Siobain Horan?

The National Provider Identifier (NPI) for Siobain Horan is 1821200312, a Type 1 (individual) record in the CMS NPPES registry.

Where does Siobain Horan practice?

The practice location on file with NPPES is in North Las Vegas, NV. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-07-04.