Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Dianne Janette Wolterstorff, ARNP

Family Nurse Practitioner in Yakima, WA · enumerated 2007.

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

National Provider Identifier

1508993452

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Registry record

Entity type Individual (Type 1)

Name Mrs. Dianne Janette Wolterstorff

Credential ARNP

Sex Female

Practice address 402 S 12th Ave, Yakima, WA, 98902

Phone (509) 573-2598

Fax (509) 452-5224

Enumeration date Feb 27, 2007

Last updated in NPPES Oct 25, 2019

Taxonomy & licenses

363LS0200X School Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License AP30003149 (WA) Secondary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License AP30003419 (WA) Primary

Other identifiers

Identifier	Type	State	Issuer
1044528	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 Dianne Wolterstorff?

Dianne Wolterstorff is registered in NPPES with the primary taxonomy of Family Nurse Practitioner. 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.

Other providers at this practice address

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Yakima Valley Professional Services on 12th, PC Multi-Specialty Clinic/Center · Yakima, WA NPI 1356393383 Paul Emmans Family Medicine Physician · Yakima, WA NPI 1033130646 Anne Tweedy Nurse Practitioner · Yakima, WA NPI 1659395531 Jeffrey Bartlett Pediatrics Physician · Yakima, WA NPI 1366547416 Roy Simms Pediatrics Physician · Yakima, WA NPI 1174628069 Michael Crook Pediatrics Physician · Yakima, WA NPI 1922103803 Michael Schaffrinna Pediatric Adolescent Medicine Physician · Yakima, WA NPI 1548352487 Chester Chua Internal Medicine Physician · Yakima, WA NPI 1437293206

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-10-25.