Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Matthew Biwer, OD

Optometrist in Sidney, MT · enumerated 2008.

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

National Provider Identifier

1619129111

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Registry record

Entity type Individual (Type 1)

Name Dr. Matthew Biwer

Credential OD

Sex Male

Practice address 124 S Central Ave, Sidney, MT, 59270

Phone (406) 482-2609

Fax (406) 482-2697

Enumeration date Oct 15, 2008

Last updated in NPPES Jun 18, 2026

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 53 (VI) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 5670 (MT) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 35801 (CA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD 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

Where does Matthew Biwer practice?

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

What is the NPI number for Matthew Biwer?

The National Provider Identifier (NPI) for Matthew Biwer is 1619129111, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Kristin O'Brien Optometrist · Sidney, MT NPI 1487800017

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-18.