NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. Matthew Meier

Internal Medicine Physician in O Fallon, MO · enumerated 2006.

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

National Provider Identifier

1578574372

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Registry record

Entity type Individual (Type 1)
Name Mr. Matthew Meier
Sex Male
Practice address O Fallon, MO, 63366
Phone (636) 294-5757
Fax (636) 294-5742
Enumeration date Aug 10, 2006
Last updated in NPPES Apr 5, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License DOR9J58 (MO) Primary

Other identifiers

Identifier Type State Issuer
P00061101 Other MO RAILROAD MEDICARE

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.

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Frequently asked questions

What is the NPI number for Matthew Meier?
The National Provider Identifier (NPI) for Matthew Meier is 1578574372, a Type 1 (individual) record in the CMS NPPES registry.
Where does Matthew Meier practice?
The practice location on file with NPPES is in O Fallon, MO. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-04-05.