Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew Brenton Niemeyer, D.O

Hospitalist Physician in Billings, MT · enumerated 2015.

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

National Provider Identifier

1427442631

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Registry record

Entity type Individual (Type 1)

Name Matthew Brenton Niemeyer

Credential D.O

Sex Male

Practice address 2800 10th Ave N, Billings, MT, 59101

Phone (406) 238-5442

Enumeration date Mar 25, 2015

Last updated in NPPES Feb 4, 2025

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MED-RES-LIC-42284 (MT) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MED-PHYS-LIC-66554 (MT) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License MED-PHYS-LIC-66554 (MT) 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

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

Is NPI 1427442631 active?

Yes, as of the latest NPPES snapshot, NPI 1427442631 is active (record last updated 2025-02-04).

How do I verify Matthew Niemeyer's NPI record?

Cross-check NPI 1427442631 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-04.