Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Thomas Armstrong, D.D.S.

General Practice Dentistry in Troy, OH · enumerated 2005.

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

National Provider Identifier

1093713570

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Thomas Armstrong

Credential D.D.S.

Sex Male

Practice address 1364 W Main St, Troy, OH, 45373

Phone (937) 339-3708

Fax (937) 339-2320

Enumeration date Jul 8, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 30-018950 (OH) Primary

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

Other identifiers

Identifier	Type	State	Issuer
0913757	Medicaid	OH	-

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 Mark Armstrong?

The National Provider Identifier (NPI) for Mark Armstrong is 1093713570, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Armstrong practice?

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

Other providers at this practice address

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Tony Hirschfeld Dentist · Troy, OH NPI 1447464391

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.