Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marni Lynn Johnson Martin, AU.D.

Audiologist in Vermillion, SD · enumerated 2007.

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

National Provider Identifier

1659590503

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Registry record

Entity type Individual (Type 1)

Name Dr. Marni Lynn Johnson Martin

Credential AU.D.

Sex Female

Practice address 414 E Clark St, Vermillion, SD, 57069

Phone (605) 677-5474

Enumeration date Apr 25, 2007

Last updated in NPPES Jun 28, 2011

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License 315 (SD) Primary

231HA2400X Assistive Technology Practitioner Audiologist Speech, Language and Hearing Service Providers · License 315 (SD) Secondary

231HA2500X Assistive Technology Supplier Audiologist Speech, Language and Hearing Service Providers · License 315 (SD) Secondary

237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License 315 (SD) Secondary

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 Marni Martin?

Marni Martin 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 2011-06-28.