Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas Martin Grisius, D.D.S.,M.S.

Orthodontics and Dentofacial Orthopedics Dentistry in Purcellville, VA · enumerated 2007.

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

National Provider Identifier

1457544918

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas Martin Grisius

Credential D.D.S.,M.S.

Sex Male

Practice address 610 E Main St, Purcellville, VA, 20132

Phone (540) 338-8125

Fax (540) 441-7070

Enumeration date Aug 19, 2007

Last updated in NPPES Feb 18, 2020

Taxonomy & licenses

1223X0400X Orthodontics and Dentofacial Orthopedics Dentistry Dental Providers · License 0401410106 (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

What is the NPI number for Thomas Grisius?

The National Provider Identifier (NPI) for Thomas Grisius is 1457544918, a Type 1 (individual) record in the CMS NPPES registry.

Where does Thomas Grisius practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-02-18.