Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

KARIN BERTHA DUFF
NPI 1326973371
Hearing Instrument Specialist in Vallejo, CA

Q: What is Karin Duff's NPI number?

The NPI number for Karin Duff is 1326973371. It was assigned to this individual provider in the NPPES registry on June 12, 2026.

Q: What is Karin Duff's specialty?

The primary specialty registered for this NPI is Hearing Instrument Specialist with taxonomy code 237700000X.

Q: When was this NPI record last updated?

The NPPES record for Karin Duff was last updated on June 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 12, 2026

480 REDWOOD ST STE 14, VALLEJO, CA 94590(707) 642-8862(707) 642-8815 Get Directions Write a Review

NPPES record added: June 12, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Karin Bertha Duff NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

KARIN BERTHA DUFF (NPI 1326973371) is an individual hearing instrument specialist in Vallejo, California, licensed in California (HA7368) and active in the NPI registry since June 2026. She maintains a secondary practice location in Fairfield.

NPPES Registry Identity

NPI1326973371

Entity TypeIndividualFemale

Primary Taxonomy237700000X

Provider Legal NameKARIN BERTHA DUFF

Location Address480 REDWOOD ST STE 14Vallejo, CA 94590-2958

Mailing Address1904 Rollingwood DrFairfield, CA 94534-7932 · (707) 290-5124 · Fax (707) 642-8815

Phone(707) 642-8862

Fax(707) 642-8815

Sole ProprietorNo

Enumeration DateJune 12, 2026

NPPES CertifiedJune 12, 2026

✔ NPI 1326973371 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHearing Instrument SpecialistSpeech, Language and Hearing Service Providers

Taxonomy Code237700000X

License✔ Licensed in CA · HA7368

Definition

Individuals who test hearing for the selection, adaptation, fitting, adjusting, servicing, and sale of hearing aids. Hearing Instrument Specialist is a designation provided individuals who qualify by the National Hearing Aid Society

480 REDWOOD ST STE 14, Vallejo, CA 94590

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Secondary Practice Location 1

Location 11700 Pennsylvania Ave Ste BFairfield, CA 94533-3510 · Phone (707) 426-4327

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PIVOT ACUPUNCTURE & INTEGRATIVE HEALTH INC

Acupuncturist

480 REDWOOD ST STE 14
VALLEJO, CA 94590

Solano County (707) 653-0495

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Karin Duff's NPI number?

The NPI number for Karin Duff is 1326973371. It was assigned to this individual provider in the NPPES registry on June 12, 2026.

Where is Karin Duff located?

Karin Duff practices at 480 Redwood St Ste 14, Vallejo, CA 94590. The listed phone number is (707) 642-8862.

What is Karin Duff's specialty?

The primary specialty registered for this NPI is Hearing Instrument Specialist with taxonomy code 237700000X.

When was this NPI record last updated?

The NPPES record for Karin Duff was last updated on June 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.