NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark W Armstrong, DO

Family Medicine Physician in Sparta, MI · enumerated 2005.

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

National Provider Identifier

1932104882

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mark W Armstrong
Credential DO
Sex Male
Practice address 2111 12 Mile Rd Nw, Sparta, MI, 49345
Phone (616) 391-8470
Fax (616) 391-8495
Enumeration date Jun 16, 2005
Last updated in NPPES Feb 24, 2021

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 5101008843 (MI) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier Type State Issuer
3072667 Medicaid MI -

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 1932104882, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Armstrong practice?
The practice location on file with NPPES is in Sparta, MI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-24.