Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Siano

Ophthalmology Physician in Hamden, CT · enumerated 2019.

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

National Provider Identifier

1326509506

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Registry record

Entity type Individual (Type 1)

Name John Siano

Sex Male

Practice address 2200 Whitney Ave Ste 300, Hamden, CT, 06518

Phone (203) 288-2020

Fax (203) 288-2470

Enumeration date Mar 29, 2019

Last updated in NPPES Oct 31, 2023

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 73903 (CT) Primary

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 John Siano?

John Siano is registered in NPPES with the primary taxonomy of Ophthalmology 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-31.