Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Gregory P Duff, MD Inc Ps

Specialist in Bremerton, WA · enumerated 2006 · authorized official Vicki Splinter, Office Manager.

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

National Provider Identifier

1033204425

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Registry record

Entity type Organization (Type 2)

Legal business name Gregory P Duff, MD Inc Ps

Practice address 2600 Wheaton Way, Suite 311, Bremerton, WA, 98310

Phone (360) 479-2003

Fax (360) 479-7416

Enumeration date Oct 3, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

174400000X Specialist Other Service Providers · License 00034439 (WA) Primary

Authorized official

Name Vicki Splinter

Title Office Manager

Phone (360) 479-2544

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-08-22. Verify at npiregistry.cms.hhs.gov.

Where is Gregory P Duff, MD Inc Ps located?

The practice location on file with NPPES is in Bremerton, WA.

Providers at this address

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Kenneth R. Koskella, MD, Inc Specialist · Bremerton, WA NPI 1609961259

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.