Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gabrielle Mackenzie Firestone, AU.D.

Audiologist in Billings, MT · enumerated 2021.

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

National Provider Identifier

1740945815

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Registry record

Entity type Individual (Type 1)

Name Dr. Gabrielle Mackenzie Firestone

Credential AU.D.

Sex Female

Practice address 1766 Majestic Ln, Billings, MT, 59102

Phone (513) 835-2552

Enumeration date Nov 3, 2021

Last updated in NPPES Nov 3, 2021

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License A.02330 (OH) Primary

AUD · Doctor of Audiology: A licensed audiologist diagnosing and treating hearing and balance disorders. About the AUD 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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Gabrielle Firestone?

Gabrielle Firestone is registered in NPPES with the primary taxonomy of Audiologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-03.