Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Phyllis Holzworth, ARNP

Registered Nurse in Seattle, WA · enumerated 2006.

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

National Provider Identifier

1013012152

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Registry record

Entity type Individual (Type 1)

Name Phyllis Holzworth

Credential ARNP

Sex Female

Practice address 3000 California Ave Sw, Seattle, WA, 98116

Phone (206) 658-8048

Fax (206) 658-8063

Enumeration date Sep 13, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License RN00078257 (WA) Primary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License AP30001367 (WA) Secondary

Other identifiers

Identifier	Type	State	Issuer
961586	Medicaid	WA	-

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 Phyllis Holzworth?

Phyllis Holzworth is registered in NPPES with the primary taxonomy of Registered Nurse. 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 2025-09-11.