Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Istvan Mark Holden

Peer Specialist in Centralia, WA · enumerated 2022.

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

National Provider Identifier

1699427740

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Registry record

Entity type Individual (Type 1)

Name Istvan Mark Holden

Sex Male

Practice address 209 W Main St, Centralia, WA, 98531

Phone (360) 623-1265

Enumeration date Jan 20, 2022

Last updated in NPPES Jan 20, 2022

Taxonomy & licenses

175T00000X Peer Specialist Other Service Providers Primary

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 Istvan Holden?

Istvan Holden is registered in NPPES with the primary taxonomy of Peer Specialist. 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 2022-01-20.