Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregg Louis Kassan, D.D.S.

Q: What is the NPI number for Gregg Kassan?

The National Provider Identifier (NPI) for Gregg Kassan is 1861665903, a Type 1 (individual) record in the CMS NPPES registry.

General Practice Dentistry in Montclair, VA · enumerated 2008.

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

National Provider Identifier

1861665903

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregg Louis Kassan

Credential D.D.S.

Sex Male

Practice address 5077 Waterway Dr, Montclair, VA, 22025

Phone (703) 897-0463

Fax (703) 897-1155

Enumeration date Apr 9, 2008

Last updated in NPPES Apr 9, 2008

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 0401-007927 (VA) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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 Gregg Kassan practice?

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

What is the NPI number for Gregg Kassan?

The National Provider Identifier (NPI) for Gregg Kassan is 1861665903, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-09.