Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Katherine Gronn, R.D.H.

Dental Hygienist in Kodiak, AK · enumerated 2016.

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

National Provider Identifier

1477905206

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katherine Gronn

Credential R.D.H.

Sex Female

Practice address 3449 E Rezanof Dr, Dental Department, Kodiak, AK, 99615

Phone (907) 486-9800

Enumeration date Jul 5, 2016

Last updated in NPPES Jul 5, 2016

Taxonomy & licenses

124Q00000X Dental Hygienist Dental Providers · License 112742 (AK) Primary

124Q00000X Dental Hygienist Dental Providers · License 112743 (AK) Secondary

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

What specialty is Katherine Gronn?

Katherine Gronn is registered in NPPES with the primary taxonomy of Dental Hygienist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-07-05.