NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Grant Alexander Gambrall, AUD

Audiologist-Hearing Aid Fitter in Grass Valley, CA · enumerated 2019 · practices at Mountain Voice and Speech Therapy PC.

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

National Provider Identifier

1821561093

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Grant Alexander Gambrall
Credential AUD
Sex Male
Practice address 457 Sutton Way, Grass Valley, CA, 95945
Phone (530) 477-8114
Fax (530) 477-1513
Enumeration date Jan 9, 2019
Last updated in NPPES Jan 9, 2019

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License AU3258 (CA) Secondary
237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License AU3258 (CA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Grant Gambrall practice?
The practice location on file with NPPES is in Grass Valley, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Grant Gambrall?
The National Provider Identifier (NPI) for Grant Gambrall is 1821561093, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-01-09.