Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory H Sirounian, MD

Orthopaedic Surgery Physician in Garden City, NY · enumerated 2005.

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

National Provider Identifier

1558356063

Verified

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Registry record

Entity type Individual (Type 1)

Name Gregory H Sirounian

Credential MD

Sex Male

Practice address 1300 Franklin Ave, Suite Ul3a, Garden City, NY, 11530

Phone (516) 747-8900

Fax (516) 663-8166

Enumeration date Sep 12, 2005

Last updated in NPPES Apr 2, 2021

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 30048 (AZ) Primary

207XS0114X Adult Reconstructive Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 261465-1 (NY) Secondary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Gregory Sirounian practice?

The practice location on file with NPPES is in Garden City, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Gregory Sirounian?

The National Provider Identifier (NPI) for Gregory Sirounian is 1558356063, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-02.