Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Thomas Flynn Giannelli

Student in an Organized Health Care Education/Training Program in Bel Air, MD · enumerated 2024.

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

National Provider Identifier

1003665837

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Registry record

Entity type Individual (Type 1)

Name William Thomas Flynn Giannelli

Sex Male

Practice address 1002 Milchling Dr, Bel Air, MD, 21015

Phone (443) 752-2554

Enumeration date May 14, 2024

Last updated in NPPES May 14, 2024

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care 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

Where does William Giannelli practice?

The practice location on file with NPPES is in Bel Air, MD. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Giannelli?

The National Provider Identifier (NPI) for William Giannelli is 1003665837, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-14.